From 26ea712607f98d9c5840b947d8700186d5a56897 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby.or.jp>
Date: Mon, 15 Sep 2025 21:35:33 +0900
Subject: [PATCH] mruby-compiler: complete migration from cons-list to
 struct-based argument handling

This commit completes the transformation of mruby's argument processing from
cons-list based representation to direct struct field access.

Key changes:
- Transform new_args() to return struct mrb_ast_args* instead of cons-list
- Update lambda_body() to use direct struct field access for all argument types
- Fix anonymous keyword rest (**) to use intern_op(pow) marker for proper bytecode generation
- Fix argument forwarding (...) to correctly pass rest_arg to new_args()
- Eliminate mrb_ast_args_tail_node allocation by embedding fields directly in mrb_ast_args
- Update all node structure definitions to use struct mrb_ast_args*
- Remove unused NODE_ARGS enum value since args are now plain C structs

The new approach provides:
- More efficient memory usage by eliminating intermediate cons-list allocations
- Cleaner code generation with direct struct field access
- Proper distinction between anonymous kwrest and no kwrest
- Correct bytecode generation for both anonymous kwrest and argument forwarding

Fixes both anonymous keyword rest (def m(**) end) and argument forwarding
(def a(...) p(...) end) to generate correct bytecode and execute properly.

Co-authored-by: Claude <noreply@anthropic.com>
---
 mrbgems/mruby-compiler/core/codegen.c |   65 +-
 mrbgems/mruby-compiler/core/node.h    |   35 +-
 mrbgems/mruby-compiler/core/parse.y   |   81 +-
 mrbgems/mruby-compiler/core/y.tab.c   | 2261 +++++++++++++------------
 4 files changed, 1228 insertions(+), 1214 deletions(-)

diff --git a/mrbgems/mruby-compiler/core/codegen.c b/mrbgems/mruby-compiler/core/codegen.c
index bea02774c..4950ddedd 100644
--- a/mrbgems/mruby-compiler/core/codegen.c
+++ b/mrbgems/mruby-compiler/core/codegen.c
@@ -2306,7 +2306,7 @@ search_upvar(codegen_scope *s, mrb_sym id, int *idx)
  * @return The index of the newly created `mrb_irep` in the parent scope's `reps` array.
  */
 static int
-lambda_body(codegen_scope *s, node *locals, node *args, node *body, int blk)
+lambda_body(codegen_scope *s, node *locals, struct mrb_ast_args *args, node *body, int blk)
 {
   codegen_scope *parent = s;
   /* Create a new scope for the lambda/block body. */
@@ -2332,31 +2332,25 @@ lambda_body(codegen_scope *s, node *locals, node *args, node *body, int blk)
     uint32_t pos;
     node *opt;
     node *margs, *pargs;
-    node *tail;
+
+    /* args is already struct mrb_ast_args * */
 
     /* mandatory arguments */
-    ma = node_len(args->car);
-    margs = args->car;
-    tail = args->cdr->cdr->cdr->cdr;
+    ma = node_len(args->mandatory_args);
+    margs = args->mandatory_args;
 
     /* optional arguments */
-    oa = node_len(args->cdr->car);
+    oa = node_len(args->optional_args);
     /* rest argument? */
-    ra = args->cdr->cdr->car ? 1 : 0;
+    ra = args->rest_arg ? 1 : 0;
     /* mandatory arguments after rest argument */
-    pa = node_len(args->cdr->cdr->cdr->car);
-    pargs = args->cdr->cdr->cdr->car;
+    pa = node_len(args->post_mandatory_args);
+    pargs = args->post_mandatory_args;
+
     /* keyword arguments */
-    if (tail) {
-      /* Handle variable-sized NODE_ARGS_TAIL */
-      struct mrb_ast_args_tail_node *tail_node = args_tail_node(tail->cdr);
-      ka = tail_node->keywords ? node_len(tail_node->keywords) : 0;
-      kd = tail_node->kwrest ? 1 : 0;
-      ba = tail_node->block ? 1 : 0;
-    }
-    else {
-      ka = kd = ba = 0;
-    }
+    ka = args->keyword_args ? node_len(args->keyword_args) : 0;
+    kd = args->kwrest_arg ? 1 : 0;
+    ba = args->block_arg ? 1 : 0;
 
     if (ma > 0x1f || oa > 0x1f || pa > 0x1f || ka > 0x1f) {
       codegen_error(s, "too many formal arguments");
@@ -2384,7 +2378,7 @@ lambda_body(codegen_scope *s, node *locals, node *args, node *body, int blk)
     if (oa > 0) {
       genjmp_0(s, OP_JMP); /* Jump to skip all default assignments if all optional args are provided. */
     }
-    opt = args->cdr->car; /* AST node for optional arguments. */
+    opt = args->optional_args; /* AST node for optional arguments. */
     i = 0;
     while (opt) { /* Iterate through optional arguments. */
       int idx;
@@ -2408,16 +2402,11 @@ lambda_body(codegen_scope *s, node *locals, node *args, node *body, int blk)
     }
 
     /* Keyword argument processing */
-    if (tail) { /* `tail` contains keyword arguments and block argument */
+    if (ka > 0 || kd > 0) { /* Has keyword arguments or keyword rest */
       node *kwds;
-      int kwrest = 0; /* Flag for keyword rest argument (e.g., **kwargs) */
+      int kwrest = kd; /* Flag for keyword rest argument (e.g., **kwargs) */
 
-      /* Handle variable-sized NODE_ARGS_TAIL */
-      struct mrb_ast_args_tail_node *tail_node = args_tail_node(tail->cdr);
-      kwds = tail_node->keywords;
-      if (tail_node->kwrest) {
-        kwrest = 1;
-      }
+      kwds = args->keyword_args;
 
       while (kwds) {
         int jmpif_key_p, jmp_def_set = -1;
@@ -2451,20 +2440,20 @@ lambda_body(codegen_scope *s, node *locals, node *args, node *body, int blk)
         kwds = kwds->cdr;
       }
       /* Check if there are keyword args but no keyword rest */
-      int has_keywords = args_tail_node(tail->cdr)->keywords != NULL;
+      int has_keywords = args->keyword_args != NULL;
 
       if (has_keywords && !kwrest) { /* If there are keyword args but no keyword rest. */
         genop_0(s, OP_KEYEND); /* Signal end of keyword arguments. */
       }
-      /* Block argument processing */
-      if (ba) { /* If a block argument (e.g., &blk) is present. */
-        /* Handle variable-sized NODE_ARGS_TAIL */
-        mrb_sym bparam = args_tail_node(tail->cdr)->block;
-        pos = ma+oa+ra+pa+(ka||kd); /* Calculate register offset for the block parameter. */
-        if (bparam) { /* If it's a named block parameter. */
-          int idx = lv_idx(s, bparam);
-          genop_2(s, OP_MOVE, idx, pos+1); /* Move the block from its argument slot to the local variable. */
-        }
+    }
+
+    /* Block argument processing */
+    if (ba) { /* If a block argument (e.g., &blk) is present. */
+      mrb_sym bparam = args->block_arg;
+      pos = ma+oa+ra+pa+(ka||kd); /* Calculate register offset for the block parameter. */
+      if (bparam) { /* If it's a named block parameter. */
+        int idx = lv_idx(s, bparam);
+        genop_2(s, OP_MOVE, idx, pos+1); /* Move the block from its argument slot to the local variable. */
       }
     }
 
diff --git a/mrbgems/mruby-compiler/core/node.h b/mrbgems/mruby-compiler/core/node.h
index c17f7b479..f2207a3c1 100644
--- a/mrbgems/mruby-compiler/core/node.h
+++ b/mrbgems/mruby-compiler/core/node.h
@@ -245,7 +245,7 @@ struct mrb_ast_hash_node {
 struct mrb_ast_def_node {
   struct mrb_ast_var_header header;  /* 8 bytes */
   mrb_sym name;                      /* Method name */
-  struct mrb_ast_node *args;         /* Method arguments */
+  struct mrb_ast_args *args;         /* Method arguments */
   struct mrb_ast_node *body;         /* Method body */
   struct mrb_ast_node *locals;       /* Local Variables */
 } ;
@@ -254,7 +254,7 @@ struct mrb_ast_def_node {
 struct mrb_ast_sdef_node {
   struct mrb_ast_var_header header;  /* 8 bytes */
   mrb_sym name;                      /* Method name */
-  struct mrb_ast_node *args;         /* Method arguments */
+  struct mrb_ast_args *args;         /* Method arguments */
   struct mrb_ast_node *body;         /* Method body */
   struct mrb_ast_node *locals;       /* Local Variables */
   struct mrb_ast_node *obj;          /* receiver */
@@ -609,31 +609,27 @@ struct mrb_ast_rescue_node {
 struct mrb_ast_block_node {
   struct mrb_ast_var_header hdr;
   struct mrb_ast_node *locals;
-  struct mrb_ast_node *args;
+  struct mrb_ast_args *args;
   struct mrb_ast_node *body;
 };
 
-struct mrb_ast_args_node {
-  struct mrb_ast_var_header hdr;
-  struct mrb_ast_node *mandatory;
-  struct mrb_ast_node *optional;
-  mrb_sym rest;
-  struct mrb_ast_node *mandatory_after_rest;
-  struct mrb_ast_node *tail;
-};
+/* Unified argument structure - eliminates args_tail_node allocation */
+struct mrb_ast_args {
+  /* Core argument lists (parser builds these naturally) */
+  struct mrb_ast_node *mandatory_args;      /* Cons list of mandatory arguments */
+  struct mrb_ast_node *optional_args;       /* Cons list of optional arguments */
+  struct mrb_ast_node *post_mandatory_args; /* Cons list of post-mandatory arguments */
+  struct mrb_ast_node *keyword_args;        /* Cons list of keyword arguments */
 
-struct mrb_ast_args_tail_node {
-  struct mrb_ast_var_header hdr;
-  struct mrb_ast_node *keywords;
-  struct mrb_ast_node *kwrest;
-  mrb_sym block;
+  /* Special arguments (directly embedded) */
+  mrb_sym rest_arg;                         /* Rest argument symbol (0 = none) */
+  mrb_sym kwrest_arg;                       /* Keyword rest argument (0 = none) */
+  mrb_sym block_arg;                        /* Block argument symbol (0 = none) */
 };
 
 /* Advanced node casting macros */
 #define rescue_node(n) ((struct mrb_ast_rescue_node*)(n))
 #define block_node(n) ((struct mrb_ast_block_node*)(n))
-#define args_node(n) ((struct mrb_ast_args_node*)(n))
-#define args_tail_node(n) ((struct mrb_ast_args_tail_node*)(n))
 
 /* Advanced node value access macros */
 #define RESCUE_NODE_BODY(n) (rescue_node(n)->body)
@@ -673,7 +669,6 @@ struct mrb_ast_retry_node {
   struct mrb_ast_var_header hdr;
 };
 
-
 #define break_node(n) ((struct mrb_ast_break_node*)(n))
 #define next_node(n) ((struct mrb_ast_next_node*)(n))
 #define redo_node(n) ((struct mrb_ast_redo_node*)(n))
@@ -798,7 +793,7 @@ struct mrb_ast_defined_node {
 struct mrb_ast_lambda_node {
   struct mrb_ast_var_header hdr;
   struct mrb_ast_node *locals;
-  struct mrb_ast_node *args;
+  struct mrb_ast_args *args;
   struct mrb_ast_node *body;
 };
 
diff --git a/mrbgems/mruby-compiler/core/parse.y b/mrbgems/mruby-compiler/core/parse.y
index f0b1d8a57..f84e900d6 100644
--- a/mrbgems/mruby-compiler/core/parse.y
+++ b/mrbgems/mruby-compiler/core/parse.y
@@ -1273,7 +1273,7 @@ new_def(parser_state *p, mrb_sym name)
 
   init_var_header(&n->header, p, NODE_DEF, class);
   n->name = name;
-  n->args = int_to_node(p->cmdarg_stack);
+  n->args = (struct mrb_ast_args *)int_to_node(p->cmdarg_stack);
   n->locals = local_switch(p);
   n->body = NULL;
 
@@ -1288,7 +1288,7 @@ defn_setup(parser_state *p, node *d, node *a, node *b)
 
   n->locals = locals_node(p);
   p->cmdarg_stack = node_to_int(n->args);
-  n->args = a;
+  n->args = (struct mrb_ast_args *)a;
   n->body = b;
   local_resume(p, locals);
 }
@@ -1305,7 +1305,7 @@ new_sdef(parser_state *p, node *o, mrb_sym name)
   init_var_header(&sdef_node->header, p, NODE_SDEF, class);
   sdef_node->obj = o;
   sdef_node->name = name;
-  sdef_node->args = int_to_node(p->cmdarg_stack);
+  sdef_node->args = (struct mrb_ast_args *)int_to_node(p->cmdarg_stack);
   sdef_node->locals = local_switch(p);
   sdef_node->body = NULL;
   return cons_head((node*)NODE_VARIABLE, (node*)sdef_node);
@@ -1368,31 +1368,54 @@ local_add_lv(parser_state *p, node *lv)
 static node*
 new_args(parser_state *p, node *m, node *opt, mrb_sym rest, node *m2, node *tail)
 {
-  node *n;
-
   local_add_margs(p, m);
   local_add_margs(p, m2);
 
-  n = cons(m2, tail);
-  n = cons(sym_to_node(rest), n);
-  n = cons(opt, n);
+  /* Save original optional arguments before processing */
+  node *orig_opt = opt;
+
+  /* Process optional arguments (keep original side effects) */
   while (opt) {
     /* opt: (sym . (opt . lv)) -> (sym . opt) */
     local_add_lv(p, opt->car->cdr->cdr);
     opt->car->cdr = opt->car->cdr->car;
     opt = opt->cdr;
   }
-  return cons(m, n);
+
+  /* Allocate struct mrb_ast_args (no hdr) */
+  struct mrb_ast_args *args = (struct mrb_ast_args*)parser_palloc(p, sizeof(struct mrb_ast_args));
+
+  /* Initialize members */
+  args->mandatory_args = m;
+  args->optional_args = orig_opt;
+  args->rest_arg = rest;
+  args->post_mandatory_args = m2;
+
+  /* Deconstruct tail cons list: (kws . (kwrest . blk)) */
+  if (tail) {
+    args->keyword_args = (node*)tail->car;          /* kws */
+    args->kwrest_arg = (mrb_sym)(intptr_t)tail->cdr->car; /* kwrest */
+    args->block_arg = (mrb_sym)(intptr_t)tail->cdr->cdr;  /* blk */
+    cons_free(tail->cdr);
+    cons_free(tail);
+  }
+  else {
+    args->keyword_args = NULL;
+    args->kwrest_arg = 0;
+    args->block_arg = 0;
+  }
+
+  return (node*)args;
 }
 
 /* (:args_tail keywords rest_keywords_sym block_sym) */
 static node*
-new_args_tail(parser_state *p, node *kws, node *kwrest, mrb_sym blk)
+new_args_tail(parser_state *p, node *kws, mrb_sym kwrest, mrb_sym blk)
 {
   node *k;
 
-  if (kws || kwrest) {
-    local_add_kw(p, (kwrest && kwrest->cdr)? node_to_sym(kwrest->cdr) : 0);
+  if (kwrest) {
+    local_add_kw(p, kwrest);
   }
 
   local_add_blk(p);
@@ -1413,17 +1436,8 @@ new_args_tail(parser_state *p, node *kws, node *kwrest, mrb_sym blk)
     }
   }
 
-  size_t total_size = sizeof(struct mrb_ast_args_tail_node);
-  enum mrb_ast_size_class class = size_to_class(total_size);
-
-  struct mrb_ast_args_tail_node *n = (struct mrb_ast_args_tail_node*)parser_alloc_var(p, total_size, class);
-
-  init_var_header(&n->hdr, p, NODE_ARGS_TAIL, class);
-  n->keywords = kws;
-  n->kwrest = kwrest;
-  n->block = blk;
-
-  return cons_head((node*)NODE_VARIABLE, (node*)n);
+  /* Return cons list: (keyword . (kwrest . blk)) */
+  return cons(kws, cons(sym_to_node(kwrest), sym_to_node(blk)));
 }
 
 /* (:kw_arg kw_sym def_arg) */
@@ -1448,8 +1462,7 @@ new_args_dots(parser_state *p, node *m)
   mrb_sym k = intern_op(pow);
   mrb_sym b = intern_op(and);
   local_add_f(p, r);
-  return new_args(p, m, 0, r, 0,
-                  new_args_tail(p, 0, new_kw_rest_args(p, k), b));
+  return new_args(p, m, 0, r, 0, new_args_tail(p, NULL, k, b));
 }
 
 /* (:block_arg . a) */
@@ -1471,8 +1484,10 @@ setup_numparams(parser_state *p, node *a)
   if (nvars > 0) {
     int i;
     mrb_sym sym;
-    // m || opt || rest || tail
-    if (a && (a->car || (a->cdr && a->cdr->car) || (a->cdr->cdr && a->cdr->cdr->car) || (a->cdr->cdr->cdr->cdr && a->cdr->cdr->cdr->cdr->car))) {
+    // Check if any arguments are already defined
+    struct mrb_ast_args *args = (struct mrb_ast_args *)a;
+    if (a && (args->mandatory_args || args->optional_args || args->rest_arg ||
+              args->post_mandatory_args || args->keyword_args || args->kwrest_arg)) {
       yyerror(NULL, p, "ordinary parameter is defined");
     }
     else if (p->locals) {
@@ -1507,7 +1522,7 @@ new_block(parser_state *p, node *a, node *b)
 
   init_var_header(&n->hdr, p, NODE_BLOCK, class);
   n->locals = locals_node(p);
-  n->args = a;
+  n->args = (struct mrb_ast_args *)a;
   n->body = b;
 
   return cons_head((node*)NODE_VARIABLE, (node*)n);
@@ -1524,7 +1539,7 @@ new_lambda(parser_state *p, node *a, node *b)
   struct mrb_ast_lambda_node *lambda_node = (struct mrb_ast_lambda_node*)parser_alloc_var(p, total_size, class);
   init_var_header(&lambda_node->hdr, p, NODE_LAMBDA, class);
   lambda_node->locals = locals_node(p);
-  lambda_node->args = a;
+  lambda_node->args = (struct mrb_ast_args *)a;
   lambda_node->body = b;
   return cons_head((node*)NODE_VARIABLE, (node*)lambda_node);
 }
@@ -2339,9 +2354,9 @@ prohibit_literals(parser_state *p, node *n)
 %type <nd> heredoc words symbols
 %type <num> call_op call_op2     /* 0:'&.', 1:'.', 2:'::' */
 
-%type <nd> args_tail opt_args_tail f_kwarg f_kw f_kwrest
+%type <nd> args_tail opt_args_tail f_kwarg f_kw
 %type <nd> f_block_kwarg f_block_kw block_args_tail opt_block_args_tail
-%type <id> f_label
+%type <id> f_label f_kwrest
 
 %token tUPLUS             "unary plus"
 %token tUMINUS            "unary minus"
@@ -4532,11 +4547,11 @@ kwrest_mark     : tPOW
 
 f_kwrest        : kwrest_mark tIDENTIFIER
                     {
-                      $$ = new_kw_rest_args(p, $2);
+                      $$ = $2;
                     }
                 | kwrest_mark
                     {
-                      $$ = new_kw_rest_args(p, 0);
+                      $$ = intern_op(pow);
                     }
                 ;
 
diff --git a/mrbgems/mruby-compiler/core/y.tab.c b/mrbgems/mruby-compiler/core/y.tab.c
index f550e6905..e666b880b 100644
--- a/mrbgems/mruby-compiler/core/y.tab.c
+++ b/mrbgems/mruby-compiler/core/y.tab.c
@@ -1335,7 +1335,7 @@ new_def(parser_state *p, mrb_sym name)
 
   init_var_header(&n->header, p, NODE_DEF, class);
   n->name = name;
-  n->args = int_to_node(p->cmdarg_stack);
+  n->args = (struct mrb_ast_args *)int_to_node(p->cmdarg_stack);
   n->locals = local_switch(p);
   n->body = NULL;
 
@@ -1350,7 +1350,7 @@ defn_setup(parser_state *p, node *d, node *a, node *b)
 
   n->locals = locals_node(p);
   p->cmdarg_stack = node_to_int(n->args);
-  n->args = a;
+  n->args = (struct mrb_ast_args *)a;
   n->body = b;
   local_resume(p, locals);
 }
@@ -1367,7 +1367,7 @@ new_sdef(parser_state *p, node *o, mrb_sym name)
   init_var_header(&sdef_node->header, p, NODE_SDEF, class);
   sdef_node->obj = o;
   sdef_node->name = name;
-  sdef_node->args = int_to_node(p->cmdarg_stack);
+  sdef_node->args = (struct mrb_ast_args *)int_to_node(p->cmdarg_stack);
   sdef_node->locals = local_switch(p);
   sdef_node->body = NULL;
   return cons_head((node*)NODE_VARIABLE, (node*)sdef_node);
@@ -1430,31 +1430,54 @@ local_add_lv(parser_state *p, node *lv)
 static node*
 new_args(parser_state *p, node *m, node *opt, mrb_sym rest, node *m2, node *tail)
 {
-  node *n;
-
   local_add_margs(p, m);
   local_add_margs(p, m2);
 
-  n = cons(m2, tail);
-  n = cons(sym_to_node(rest), n);
-  n = cons(opt, n);
+  /* Save original optional arguments before processing */
+  node *orig_opt = opt;
+
+  /* Process optional arguments (keep original side effects) */
   while (opt) {
     /* opt: (sym . (opt . lv)) -> (sym . opt) */
     local_add_lv(p, opt->car->cdr->cdr);
     opt->car->cdr = opt->car->cdr->car;
     opt = opt->cdr;
   }
-  return cons(m, n);
+
+  /* Allocate struct mrb_ast_args (no hdr) */
+  struct mrb_ast_args *args = (struct mrb_ast_args*)parser_palloc(p, sizeof(struct mrb_ast_args));
+
+  /* Initialize members */
+  args->mandatory_args = m;
+  args->optional_args = orig_opt;
+  args->rest_arg = rest;
+  args->post_mandatory_args = m2;
+
+  /* Deconstruct tail cons list: (kws . (kwrest . blk)) */
+  if (tail) {
+    args->keyword_args = (node*)tail->car;          /* kws */
+    args->kwrest_arg = (mrb_sym)(intptr_t)tail->cdr->car; /* kwrest */
+    args->block_arg = (mrb_sym)(intptr_t)tail->cdr->cdr;  /* blk */
+    cons_free(tail->cdr);
+    cons_free(tail);
+  }
+  else {
+    args->keyword_args = NULL;
+    args->kwrest_arg = 0;
+    args->block_arg = 0;
+  }
+
+  return (node*)args;
 }
 
 /* (:args_tail keywords rest_keywords_sym block_sym) */
 static node*
-new_args_tail(parser_state *p, node *kws, node *kwrest, mrb_sym blk)
+new_args_tail(parser_state *p, node *kws, mrb_sym kwrest, mrb_sym blk)
 {
   node *k;
 
-  if (kws || kwrest) {
-    local_add_kw(p, (kwrest && kwrest->cdr)? node_to_sym(kwrest->cdr) : 0);
+  if (kwrest) {
+    local_add_kw(p, kwrest);
   }
 
   local_add_blk(p);
@@ -1475,17 +1498,8 @@ new_args_tail(parser_state *p, node *kws, node *kwrest, mrb_sym blk)
     }
   }
 
-  size_t total_size = sizeof(struct mrb_ast_args_tail_node);
-  enum mrb_ast_size_class class = size_to_class(total_size);
-
-  struct mrb_ast_args_tail_node *n = (struct mrb_ast_args_tail_node*)parser_alloc_var(p, total_size, class);
-
-  init_var_header(&n->hdr, p, NODE_ARGS_TAIL, class);
-  n->keywords = kws;
-  n->kwrest = kwrest;
-  n->block = blk;
-
-  return cons_head((node*)NODE_VARIABLE, (node*)n);
+  /* Return cons list: (keyword . (kwrest . blk)) */
+  return cons(kws, cons(sym_to_node(kwrest), sym_to_node(blk)));
 }
 
 /* (:kw_arg kw_sym def_arg) */
@@ -1510,8 +1524,7 @@ new_args_dots(parser_state *p, node *m)
   mrb_sym k = intern_op(pow);
   mrb_sym b = intern_op(and);
   local_add_f(p, r);
-  return new_args(p, m, 0, r, 0,
-                  new_args_tail(p, 0, new_kw_rest_args(p, k), b));
+  return new_args(p, m, 0, r, 0, new_args_tail(p, NULL, k, b));
 }
 
 /* (:block_arg . a) */
@@ -1533,8 +1546,10 @@ setup_numparams(parser_state *p, node *a)
   if (nvars > 0) {
     int i;
     mrb_sym sym;
-    // m || opt || rest || tail
-    if (a && (a->car || (a->cdr && a->cdr->car) || (a->cdr->cdr && a->cdr->cdr->car) || (a->cdr->cdr->cdr->cdr && a->cdr->cdr->cdr->cdr->car))) {
+    // Check if any arguments are already defined
+    struct mrb_ast_args *args = (struct mrb_ast_args *)a;
+    if (a && (args->mandatory_args || args->optional_args || args->rest_arg ||
+              args->post_mandatory_args || args->keyword_args || args->kwrest_arg)) {
       yyerror(NULL, p, "ordinary parameter is defined");
     }
     else if (p->locals) {
@@ -1569,7 +1584,7 @@ new_block(parser_state *p, node *a, node *b)
 
   init_var_header(&n->hdr, p, NODE_BLOCK, class);
   n->locals = locals_node(p);
-  n->args = a;
+  n->args = (struct mrb_ast_args *)a;
   n->body = b;
 
   return cons_head((node*)NODE_VARIABLE, (node*)n);
@@ -1586,7 +1601,7 @@ new_lambda(parser_state *p, node *a, node *b)
   struct mrb_ast_lambda_node *lambda_node = (struct mrb_ast_lambda_node*)parser_alloc_var(p, total_size, class);
   init_var_header(&lambda_node->hdr, p, NODE_LAMBDA, class);
   lambda_node->locals = locals_node(p);
-  lambda_node->args = a;
+  lambda_node->args = (struct mrb_ast_args *)a;
   lambda_node->body = b;
   return cons_head((node*)NODE_VARIABLE, (node*)lambda_node);
 }
@@ -2296,7 +2311,7 @@ prohibit_literals(parser_state *p, node *n)
 /* xxx ----------------------------- */
 
 
-#line 2300 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 2315 "mrbgems/mruby-compiler/core/y.tab.c"
 
 # ifndef YY_CAST
 #  ifdef __cplusplus
@@ -2467,7 +2482,7 @@ extern int yydebug;
 #if ! defined YYSTYPE && ! defined YYSTYPE_IS_DECLARED
 union YYSTYPE
 {
-#line 2243 "mrbgems/mruby-compiler/core/parse.y"
+#line 2258 "mrbgems/mruby-compiler/core/parse.y"
 
     node *nd;
     mrb_sym id;
@@ -2475,7 +2490,7 @@ union YYSTYPE
     stack_type stack;
     const struct vtable *vars;
 
-#line 2479 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 2494 "mrbgems/mruby-compiler/core/y.tab.c"
 
 };
 typedef union YYSTYPE YYSTYPE;
@@ -3234,69 +3249,69 @@ static const yytype_uint8 yytranslate[] =
 /* YYRLINE[YYN] -- Source line where rule number YYN was defined.  */
 static const yytype_int16 yyrline[] =
 {
-       0,  2414,  2414,  2414,  2424,  2430,  2434,  2438,  2442,  2448,
-    2450,  2449,  2463,  2489,  2495,  2499,  2503,  2509,  2515,  2515,
-    2519,  2523,  2527,  2531,  2540,  2549,  2553,  2558,  2559,  2563,
-    2567,  2571,  2575,  2581,  2584,  2588,  2592,  2596,  2600,  2604,
-    2609,  2613,  2622,  2631,  2640,  2649,  2656,  2657,  2661,  2664,
-    2665,  2669,  2673,  2677,  2681,  2684,  2694,  2693,  2708,  2717,
-    2718,  2721,  2722,  2729,  2728,  2743,  2747,  2752,  2756,  2761,
-    2765,  2770,  2774,  2778,  2782,  2786,  2792,  2796,  2802,  2803,
-    2809,  2813,  2817,  2821,  2825,  2829,  2833,  2837,  2841,  2845,
-    2851,  2852,  2858,  2862,  2868,  2872,  2878,  2882,  2886,  2890,
-    2894,  2898,  2904,  2910,  2917,  2921,  2925,  2929,  2933,  2937,
-    2943,  2949,  2954,  2960,  2964,  2967,  2971,  2975,  2982,  2983,
-    2984,  2985,  2990,  2997,  2998,  3001,  3005,  3005,  3011,  3012,
-    3013,  3014,  3015,  3016,  3017,  3018,  3019,  3020,  3021,  3022,
-    3023,  3024,  3025,  3026,  3027,  3028,  3029,  3030,  3031,  3032,
-    3033,  3034,  3035,  3036,  3037,  3038,  3039,  3040,  3043,  3043,
-    3043,  3044,  3044,  3045,  3045,  3045,  3046,  3046,  3046,  3046,
-    3047,  3047,  3047,  3048,  3048,  3048,  3049,  3049,  3049,  3049,
-    3050,  3050,  3050,  3050,  3051,  3051,  3051,  3051,  3052,  3052,
-    3052,  3052,  3053,  3053,  3053,  3053,  3054,  3054,  3057,  3061,
-    3065,  3069,  3073,  3077,  3081,  3086,  3091,  3096,  3100,  3104,
-    3108,  3112,  3116,  3120,  3124,  3128,  3132,  3136,  3140,  3144,
-    3148,  3152,  3156,  3160,  3164,  3168,  3172,  3176,  3180,  3184,
-    3188,  3192,  3196,  3200,  3204,  3208,  3212,  3216,  3220,  3224,
-    3228,  3232,  3236,  3240,  3244,  3253,  3262,  3271,  3280,  3286,
-    3287,  3291,  3295,  3301,  3305,  3312,  3316,  3325,  3342,  3343,
-    3346,  3347,  3348,  3352,  3356,  3362,  3367,  3371,  3375,  3379,
-    3385,  3385,  3396,  3400,  3406,  3410,  3416,  3419,  3424,  3428,
-    3432,  3437,  3441,  3447,  3452,  3456,  3462,  3463,  3467,  3471,
-    3472,  3473,  3474,  3475,  3480,  3479,  3491,  3495,  3490,  3500,
-    3500,  3504,  3508,  3512,  3516,  3520,  3524,  3528,  3532,  3536,
-    3540,  3544,  3545,  3551,  3558,  3550,  3571,  3579,  3587,  3587,
-    3587,  3594,  3594,  3594,  3601,  3607,  3612,  3614,  3611,  3623,
-    3621,  3639,  3644,  3637,  3661,  3659,  3675,  3685,  3696,  3700,
-    3704,  3708,  3714,  3721,  3722,  3723,  3726,  3727,  3730,  3731,
-    3739,  3740,  3746,  3750,  3753,  3757,  3761,  3765,  3770,  3774,
-    3778,  3782,  3788,  3787,  3797,  3801,  3805,  3809,  3815,  3820,
-    3825,  3829,  3833,  3837,  3841,  3845,  3849,  3853,  3857,  3861,
-    3865,  3869,  3873,  3877,  3881,  3887,  3892,  3899,  3899,  3903,
-    3908,  3914,  3918,  3924,  3925,  3928,  3933,  3936,  3940,  3946,
-    3950,  3957,  3956,  3973,  3978,  3982,  3987,  3994,  3998,  4002,
-    4006,  4010,  4014,  4018,  4022,  4026,  4033,  4032,  4047,  4046,
-    4062,  4070,  4079,  4082,  4089,  4092,  4096,  4097,  4100,  4104,
-    4107,  4111,  4114,  4115,  4116,  4117,  4120,  4121,  4127,  4132,
-    4137,  4142,  4148,  4149,  4155,  4161,  4160,  4172,  4176,  4182,
-    4186,  4192,  4201,  4212,  4215,  4216,  4219,  4225,  4231,  4232,
-    4235,  4242,  4241,  4256,  4260,  4268,  4272,  4284,  4291,  4298,
-    4299,  4300,  4301,  4302,  4306,  4312,  4316,  4324,  4325,  4326,
-    4330,  4336,  4340,  4344,  4348,  4352,  4358,  4362,  4368,  4372,
-    4376,  4380,  4384,  4388,  4392,  4400,  4407,  4413,  4414,  4418,
-    4422,  4421,  4438,  4439,  4442,  4448,  4452,  4458,  4459,  4463,
-    4467,  4473,  4477,  4483,  4489,  4496,  4502,  4509,  4513,  4519,
-    4523,  4529,  4530,  4533,  4537,  4543,  4547,  4551,  4555,  4561,
-    4566,  4571,  4575,  4579,  4583,  4587,  4591,  4595,  4599,  4603,
-    4607,  4611,  4615,  4619,  4623,  4628,  4634,  4639,  4644,  4649,
-    4654,  4661,  4665,  4672,  4677,  4676,  4688,  4692,  4698,  4706,
-    4714,  4722,  4726,  4732,  4736,  4742,  4743,  4746,  4751,  4758,
-    4759,  4762,  4766,  4772,  4776,  4782,  4788,  4788,  4795,  4796,
-    4802,  4806,  4812,  4818,  4823,  4827,  4832,  4837,  4853,  4858,
-    4864,  4865,  4866,  4869,  4870,  4871,  4872,  4875,  4876,  4877,
-    4880,  4881,  4884,  4888,  4894,  4895,  4901,  4902,  4905,  4906,
-    4909,  4912,  4913,  4914,  4917,  4918,  4921,  4926,  4929,  4930,
-    4934
+       0,  2429,  2429,  2429,  2439,  2445,  2449,  2453,  2457,  2463,
+    2465,  2464,  2478,  2504,  2510,  2514,  2518,  2524,  2530,  2530,
+    2534,  2538,  2542,  2546,  2555,  2564,  2568,  2573,  2574,  2578,
+    2582,  2586,  2590,  2596,  2599,  2603,  2607,  2611,  2615,  2619,
+    2624,  2628,  2637,  2646,  2655,  2664,  2671,  2672,  2676,  2679,
+    2680,  2684,  2688,  2692,  2696,  2699,  2709,  2708,  2723,  2732,
+    2733,  2736,  2737,  2744,  2743,  2758,  2762,  2767,  2771,  2776,
+    2780,  2785,  2789,  2793,  2797,  2801,  2807,  2811,  2817,  2818,
+    2824,  2828,  2832,  2836,  2840,  2844,  2848,  2852,  2856,  2860,
+    2866,  2867,  2873,  2877,  2883,  2887,  2893,  2897,  2901,  2905,
+    2909,  2913,  2919,  2925,  2932,  2936,  2940,  2944,  2948,  2952,
+    2958,  2964,  2969,  2975,  2979,  2982,  2986,  2990,  2997,  2998,
+    2999,  3000,  3005,  3012,  3013,  3016,  3020,  3020,  3026,  3027,
+    3028,  3029,  3030,  3031,  3032,  3033,  3034,  3035,  3036,  3037,
+    3038,  3039,  3040,  3041,  3042,  3043,  3044,  3045,  3046,  3047,
+    3048,  3049,  3050,  3051,  3052,  3053,  3054,  3055,  3058,  3058,
+    3058,  3059,  3059,  3060,  3060,  3060,  3061,  3061,  3061,  3061,
+    3062,  3062,  3062,  3063,  3063,  3063,  3064,  3064,  3064,  3064,
+    3065,  3065,  3065,  3065,  3066,  3066,  3066,  3066,  3067,  3067,
+    3067,  3067,  3068,  3068,  3068,  3068,  3069,  3069,  3072,  3076,
+    3080,  3084,  3088,  3092,  3096,  3101,  3106,  3111,  3115,  3119,
+    3123,  3127,  3131,  3135,  3139,  3143,  3147,  3151,  3155,  3159,
+    3163,  3167,  3171,  3175,  3179,  3183,  3187,  3191,  3195,  3199,
+    3203,  3207,  3211,  3215,  3219,  3223,  3227,  3231,  3235,  3239,
+    3243,  3247,  3251,  3255,  3259,  3268,  3277,  3286,  3295,  3301,
+    3302,  3306,  3310,  3316,  3320,  3327,  3331,  3340,  3357,  3358,
+    3361,  3362,  3363,  3367,  3371,  3377,  3382,  3386,  3390,  3394,
+    3400,  3400,  3411,  3415,  3421,  3425,  3431,  3434,  3439,  3443,
+    3447,  3452,  3456,  3462,  3467,  3471,  3477,  3478,  3482,  3486,
+    3487,  3488,  3489,  3490,  3495,  3494,  3506,  3510,  3505,  3515,
+    3515,  3519,  3523,  3527,  3531,  3535,  3539,  3543,  3547,  3551,
+    3555,  3559,  3560,  3566,  3573,  3565,  3586,  3594,  3602,  3602,
+    3602,  3609,  3609,  3609,  3616,  3622,  3627,  3629,  3626,  3638,
+    3636,  3654,  3659,  3652,  3676,  3674,  3690,  3700,  3711,  3715,
+    3719,  3723,  3729,  3736,  3737,  3738,  3741,  3742,  3745,  3746,
+    3754,  3755,  3761,  3765,  3768,  3772,  3776,  3780,  3785,  3789,
+    3793,  3797,  3803,  3802,  3812,  3816,  3820,  3824,  3830,  3835,
+    3840,  3844,  3848,  3852,  3856,  3860,  3864,  3868,  3872,  3876,
+    3880,  3884,  3888,  3892,  3896,  3902,  3907,  3914,  3914,  3918,
+    3923,  3929,  3933,  3939,  3940,  3943,  3948,  3951,  3955,  3961,
+    3965,  3972,  3971,  3988,  3993,  3997,  4002,  4009,  4013,  4017,
+    4021,  4025,  4029,  4033,  4037,  4041,  4048,  4047,  4062,  4061,
+    4077,  4085,  4094,  4097,  4104,  4107,  4111,  4112,  4115,  4119,
+    4122,  4126,  4129,  4130,  4131,  4132,  4135,  4136,  4142,  4147,
+    4152,  4157,  4163,  4164,  4170,  4176,  4175,  4187,  4191,  4197,
+    4201,  4207,  4216,  4227,  4230,  4231,  4234,  4240,  4246,  4247,
+    4250,  4257,  4256,  4271,  4275,  4283,  4287,  4299,  4306,  4313,
+    4314,  4315,  4316,  4317,  4321,  4327,  4331,  4339,  4340,  4341,
+    4345,  4351,  4355,  4359,  4363,  4367,  4373,  4377,  4383,  4387,
+    4391,  4395,  4399,  4403,  4407,  4415,  4422,  4428,  4429,  4433,
+    4437,  4436,  4453,  4454,  4457,  4463,  4467,  4473,  4474,  4478,
+    4482,  4488,  4492,  4498,  4504,  4511,  4517,  4524,  4528,  4534,
+    4538,  4544,  4545,  4548,  4552,  4558,  4562,  4566,  4570,  4576,
+    4581,  4586,  4590,  4594,  4598,  4602,  4606,  4610,  4614,  4618,
+    4622,  4626,  4630,  4634,  4638,  4643,  4649,  4654,  4659,  4664,
+    4669,  4676,  4680,  4687,  4692,  4691,  4703,  4707,  4713,  4721,
+    4729,  4737,  4741,  4747,  4751,  4757,  4758,  4761,  4766,  4773,
+    4774,  4777,  4781,  4787,  4791,  4797,  4803,  4803,  4810,  4811,
+    4817,  4821,  4827,  4833,  4838,  4842,  4847,  4852,  4868,  4873,
+    4879,  4880,  4881,  4884,  4885,  4886,  4887,  4890,  4891,  4892,
+    4895,  4896,  4899,  4903,  4909,  4910,  4916,  4917,  4920,  4921,
+    4924,  4927,  4928,  4929,  4932,  4933,  4936,  4941,  4944,  4945,
+    4949
 };
 #endif
 
@@ -7273,7 +7288,7 @@ YYLTYPE yylloc = yyloc_default;
 
 
 
-#line 7277 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7292 "mrbgems/mruby-compiler/core/y.tab.c"
 
   yylsp[0] = yylloc;
   goto yysetstate;
@@ -7486,84 +7501,84 @@ yyreduce:
   switch (yyn)
     {
   case 2: /* $@1: %empty  */
-#line 2414 "mrbgems/mruby-compiler/core/parse.y"
+#line 2429 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       p->lstate = EXPR_BEG;
                       if (!p->locals) p->locals = cons(0,0);
                     }
-#line 7495 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7510 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 3: /* program: $@1 top_compstmt  */
-#line 2419 "mrbgems/mruby-compiler/core/parse.y"
+#line 2434 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       p->tree = new_scope(p, (yyvsp[0].nd));
                     }
-#line 7503 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7518 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 4: /* top_compstmt: top_stmts opt_terms  */
-#line 2425 "mrbgems/mruby-compiler/core/parse.y"
+#line 2440 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-1].nd);
                     }
-#line 7511 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7526 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 5: /* top_stmts: none  */
-#line 2431 "mrbgems/mruby-compiler/core/parse.y"
+#line 2446 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_stmts(p, 0);
                     }
-#line 7519 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7534 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 6: /* top_stmts: top_stmt  */
-#line 2435 "mrbgems/mruby-compiler/core/parse.y"
+#line 2450 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_stmts(p, (yyvsp[0].nd));
                     }
-#line 7527 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7542 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 7: /* top_stmts: top_stmts terms top_stmt  */
-#line 2439 "mrbgems/mruby-compiler/core/parse.y"
+#line 2454 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push((yyvsp[-2].nd), newline_node((yyvsp[0].nd)));
                     }
-#line 7535 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7550 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 8: /* top_stmts: error top_stmt  */
-#line 2443 "mrbgems/mruby-compiler/core/parse.y"
+#line 2458 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_stmts(p, 0);
                     }
-#line 7543 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7558 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 10: /* @2: %empty  */
-#line 2450 "mrbgems/mruby-compiler/core/parse.y"
+#line 2465 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = local_switch(p);
                       nvars_block(p);
                     }
-#line 7552 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7567 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 11: /* top_stmt: "'BEGIN'" @2 '{' top_compstmt '}'  */
-#line 2455 "mrbgems/mruby-compiler/core/parse.y"
+#line 2470 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       yyerror(&(yylsp[-4]), p, "BEGIN not supported");
                       local_resume(p, (yyvsp[-3].nd));
                       nvars_unnest(p);
                       (yyval.nd) = 0;
                     }
-#line 7563 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7578 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 12: /* bodystmt: compstmt opt_rescue opt_else opt_ensure  */
-#line 2467 "mrbgems/mruby-compiler/core/parse.y"
+#line 2482 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       if ((yyvsp[-2].nd)) {
                         (yyval.nd) = new_rescue(p, (yyvsp[-3].nd), (yyvsp[-2].nd), (yyvsp[-1].nd));
@@ -7584,91 +7599,91 @@ yyreduce:
                         }
                       }
                     }
-#line 7588 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7603 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 13: /* compstmt: stmts opt_terms  */
-#line 2490 "mrbgems/mruby-compiler/core/parse.y"
+#line 2505 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-1].nd);
                     }
-#line 7596 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7611 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 14: /* stmts: none  */
-#line 2496 "mrbgems/mruby-compiler/core/parse.y"
+#line 2511 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_stmts(p, 0);
                     }
-#line 7604 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7619 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 15: /* stmts: stmt  */
-#line 2500 "mrbgems/mruby-compiler/core/parse.y"
+#line 2515 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_stmts(p, (yyvsp[0].nd));
                     }
-#line 7612 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7627 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 16: /* stmts: stmts terms stmt  */
-#line 2504 "mrbgems/mruby-compiler/core/parse.y"
+#line 2519 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       /* Update the cons-list inside the existing variable-sized node */
                       STMTS_NODE_STMTS((yyvsp[-2].nd)->cdr) = push(STMTS_NODE_STMTS((yyvsp[-2].nd)->cdr), newline_node((yyvsp[0].nd)));
                       (yyval.nd) = (yyvsp[-2].nd);
                     }
-#line 7622 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7637 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 17: /* stmts: error stmt  */
-#line 2510 "mrbgems/mruby-compiler/core/parse.y"
+#line 2525 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_stmts(p, (yyvsp[0].nd));
                     }
-#line 7630 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7645 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 18: /* $@3: %empty  */
-#line 2515 "mrbgems/mruby-compiler/core/parse.y"
+#line 2530 "mrbgems/mruby-compiler/core/parse.y"
                                      {p->lstate = EXPR_FNAME;}
-#line 7636 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7651 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 19: /* stmt: "'alias'" fsym $@3 fsym  */
-#line 2516 "mrbgems/mruby-compiler/core/parse.y"
+#line 2531 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_alias(p, (yyvsp[-2].id), (yyvsp[0].id));
                     }
-#line 7644 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7659 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 20: /* stmt: "'undef'" undef_list  */
-#line 2520 "mrbgems/mruby-compiler/core/parse.y"
+#line 2535 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_undef(p, (yyvsp[0].nd));
                     }
-#line 7652 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7667 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 21: /* stmt: stmt "'if' modifier" expr_value  */
-#line 2524 "mrbgems/mruby-compiler/core/parse.y"
+#line 2539 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_if(p, cond((yyvsp[0].nd)), (yyvsp[-2].nd), 0);
                     }
-#line 7660 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7675 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 22: /* stmt: stmt "'unless' modifier" expr_value  */
-#line 2528 "mrbgems/mruby-compiler/core/parse.y"
+#line 2543 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_if(p, cond((yyvsp[0].nd)), 0, (yyvsp[-2].nd));
                     }
-#line 7668 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7683 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 23: /* stmt: stmt "'while' modifier" expr_value  */
-#line 2532 "mrbgems/mruby-compiler/core/parse.y"
+#line 2547 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       if ((yyvsp[-2].nd) && node_type_p((yyvsp[-2].nd), NODE_BEGIN)) {
                         (yyval.nd) = new_while_mod(p, cond((yyvsp[0].nd)), (yyvsp[-2].nd));
@@ -7677,11 +7692,11 @@ yyreduce:
                         (yyval.nd) = new_while(p, cond((yyvsp[0].nd)), (yyvsp[-2].nd));
                       }
                     }
-#line 7681 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7696 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 24: /* stmt: stmt "'until' modifier" expr_value  */
-#line 2541 "mrbgems/mruby-compiler/core/parse.y"
+#line 2556 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       if ((yyvsp[-2].nd) && node_type_p((yyvsp[-2].nd), NODE_BEGIN)) {
                         (yyval.nd) = new_until_mod(p, cond((yyvsp[0].nd)), (yyvsp[-2].nd));
@@ -7690,127 +7705,127 @@ yyreduce:
                         (yyval.nd) = new_until(p, cond((yyvsp[0].nd)), (yyvsp[-2].nd));
                       }
                     }
-#line 7694 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7709 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 25: /* stmt: stmt "'rescue' modifier" stmt  */
-#line 2550 "mrbgems/mruby-compiler/core/parse.y"
+#line 2565 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_mod_rescue(p, (yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 7702 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7717 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 26: /* stmt: "'END'" '{' compstmt '}'  */
-#line 2554 "mrbgems/mruby-compiler/core/parse.y"
+#line 2569 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       yyerror(&(yylsp[-3]), p, "END not supported");
                       (yyval.nd) = new_postexe(p, (yyvsp[-1].nd));
                     }
-#line 7711 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7726 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 28: /* stmt: mlhs '=' command_call  */
-#line 2560 "mrbgems/mruby-compiler/core/parse.y"
+#line 2575 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_masgn(p, (yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 7719 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7734 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 29: /* stmt: lhs '=' mrhs  */
-#line 2564 "mrbgems/mruby-compiler/core/parse.y"
+#line 2579 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_asgn(p, (yyvsp[-2].nd), new_array(p, (yyvsp[0].nd)));
                     }
-#line 7727 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7742 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 30: /* stmt: mlhs '=' arg  */
-#line 2568 "mrbgems/mruby-compiler/core/parse.y"
+#line 2583 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_masgn(p, (yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 7735 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7750 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 31: /* stmt: mlhs '=' mrhs  */
-#line 2572 "mrbgems/mruby-compiler/core/parse.y"
+#line 2587 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_masgn(p, (yyvsp[-2].nd), new_array(p, (yyvsp[0].nd)));
                     }
-#line 7743 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7758 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 32: /* stmt: arg "=>" "local variable or method"  */
-#line 2576 "mrbgems/mruby-compiler/core/parse.y"
+#line 2591 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       node *lhs = new_xvar(p, (yyvsp[0].id), NODE_LVAR);
                       assignable(p, lhs);
                       (yyval.nd) = new_asgn(p, lhs, (yyvsp[-2].nd));
                     }
-#line 7753 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7768 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 34: /* command_asgn: lhs '=' command_rhs  */
-#line 2585 "mrbgems/mruby-compiler/core/parse.y"
+#line 2600 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_asgn(p, (yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 7761 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7776 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 35: /* command_asgn: var_lhs tOP_ASGN command_rhs  */
-#line 2589 "mrbgems/mruby-compiler/core/parse.y"
+#line 2604 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_op_asgn(p, (yyvsp[-2].nd), (yyvsp[-1].id), (yyvsp[0].nd));
                     }
-#line 7769 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7784 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 36: /* command_asgn: primary_value '[' opt_call_args ']' tOP_ASGN command_rhs  */
-#line 2593 "mrbgems/mruby-compiler/core/parse.y"
+#line 2608 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_op_asgn(p, new_call(p, (yyvsp[-5].nd), intern_op(aref), (yyvsp[-3].nd), '.'), (yyvsp[-1].id), (yyvsp[0].nd));
                     }
-#line 7777 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7792 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 37: /* command_asgn: primary_value call_op "local variable or method" tOP_ASGN command_rhs  */
-#line 2597 "mrbgems/mruby-compiler/core/parse.y"
+#line 2612 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_op_asgn(p, new_call(p, (yyvsp[-4].nd), (yyvsp[-2].id), 0, (yyvsp[-3].num)), (yyvsp[-1].id), (yyvsp[0].nd));
                     }
-#line 7785 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7800 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 38: /* command_asgn: primary_value call_op "constant" tOP_ASGN command_rhs  */
-#line 2601 "mrbgems/mruby-compiler/core/parse.y"
+#line 2616 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_op_asgn(p, new_call(p, (yyvsp[-4].nd), (yyvsp[-2].id), 0, (yyvsp[-3].num)), (yyvsp[-1].id), (yyvsp[0].nd));
                     }
-#line 7793 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7808 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 39: /* command_asgn: primary_value "::" "constant" tOP_ASGN command_call  */
-#line 2605 "mrbgems/mruby-compiler/core/parse.y"
+#line 2620 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       yyerror(&(yylsp[-4]), p, "constant re-assignment");
                       (yyval.nd) = 0;
                     }
-#line 7802 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7817 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 40: /* command_asgn: primary_value "::" "local variable or method" tOP_ASGN command_rhs  */
-#line 2610 "mrbgems/mruby-compiler/core/parse.y"
+#line 2625 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_op_asgn(p, new_call(p, (yyvsp[-4].nd), (yyvsp[-2].id), 0, tCOLON2), (yyvsp[-1].id), (yyvsp[0].nd));
                     }
-#line 7810 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7825 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 41: /* command_asgn: defn_head f_opt_arglist_paren '=' command  */
-#line 2614 "mrbgems/mruby-compiler/core/parse.y"
+#line 2629 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-3].nd);
                       endless_method_name(p, (yyvsp[-3].nd));
@@ -7819,11 +7834,11 @@ yyreduce:
                       nvars_unnest(p);
                       p->in_def--;
                     }
-#line 7823 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7838 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 42: /* command_asgn: defn_head f_opt_arglist_paren '=' command "'rescue' modifier" arg  */
-#line 2623 "mrbgems/mruby-compiler/core/parse.y"
+#line 2638 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-5].nd);
                       endless_method_name(p, (yyvsp[-5].nd));
@@ -7832,11 +7847,11 @@ yyreduce:
                       nvars_unnest(p);
                       p->in_def--;
                     }
-#line 7836 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7851 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 43: /* command_asgn: defs_head f_opt_arglist_paren '=' command  */
-#line 2632 "mrbgems/mruby-compiler/core/parse.y"
+#line 2647 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-3].nd);
                       void_expr_error(p, (yyvsp[0].nd));
@@ -7845,11 +7860,11 @@ yyreduce:
                       p->in_def--;
                       p->in_single--;
                     }
-#line 7849 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7864 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 44: /* command_asgn: defs_head f_opt_arglist_paren '=' command "'rescue' modifier" arg  */
-#line 2641 "mrbgems/mruby-compiler/core/parse.y"
+#line 2656 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-5].nd);
                       void_expr_error(p, (yyvsp[-2].nd));
@@ -7858,79 +7873,79 @@ yyreduce:
                       p->in_def--;
                       p->in_single--;
                     }
-#line 7862 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7877 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 45: /* command_asgn: backref tOP_ASGN command_rhs  */
-#line 2650 "mrbgems/mruby-compiler/core/parse.y"
+#line 2665 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       backref_error(p, (yyvsp[-2].nd));
                       (yyval.nd) = new_stmts(p, 0);
                     }
-#line 7871 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7886 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 47: /* command_rhs: command_call "'rescue' modifier" stmt  */
-#line 2658 "mrbgems/mruby-compiler/core/parse.y"
+#line 2673 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_mod_rescue(p, (yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 7879 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7894 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 50: /* expr: expr "'and'" expr  */
-#line 2666 "mrbgems/mruby-compiler/core/parse.y"
+#line 2681 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_and(p, (yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 7887 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7902 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 51: /* expr: expr "'or'" expr  */
-#line 2670 "mrbgems/mruby-compiler/core/parse.y"
+#line 2685 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_or(p, (yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 7895 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7910 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 52: /* expr: "'not'" opt_nl expr  */
-#line 2674 "mrbgems/mruby-compiler/core/parse.y"
+#line 2689 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_uni_op(p, cond((yyvsp[0].nd)), "!");
                     }
-#line 7903 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7918 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 53: /* expr: '!' command_call  */
-#line 2678 "mrbgems/mruby-compiler/core/parse.y"
+#line 2693 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_uni_op(p, cond((yyvsp[0].nd)), "!");
                     }
-#line 7911 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7926 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 55: /* defn_head: "'def'" fname  */
-#line 2685 "mrbgems/mruby-compiler/core/parse.y"
+#line 2700 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_def(p, (yyvsp[0].id));
                       p->cmdarg_stack = 0;
                       p->in_def++;
                       nvars_block(p);
                     }
-#line 7922 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7937 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 56: /* $@4: %empty  */
-#line 2694 "mrbgems/mruby-compiler/core/parse.y"
+#line 2709 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       p->lstate = EXPR_FNAME;
                     }
-#line 7930 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7945 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 57: /* defs_head: "'def'" singleton dot_or_colon $@4 fname  */
-#line 2698 "mrbgems/mruby-compiler/core/parse.y"
+#line 2713 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_sdef(p, (yyvsp[-3].nd), (yyvsp[0].id));
                       p->cmdarg_stack = 0;
@@ -7939,1054 +7954,1054 @@ yyreduce:
                       nvars_block(p);
                       p->lstate = EXPR_ENDFN; /* force for args */
                     }
-#line 7943 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7958 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 58: /* expr_value: expr  */
-#line 2709 "mrbgems/mruby-compiler/core/parse.y"
+#line 2724 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       if (!(yyvsp[0].nd)) (yyval.nd) = new_nil(p);
                       else {
                         (yyval.nd) = (yyvsp[0].nd);
                       }
                     }
-#line 7954 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7969 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 62: /* block_command: block_call call_op2 operation2 command_args  */
-#line 2723 "mrbgems/mruby-compiler/core/parse.y"
+#line 2738 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-3].nd), (yyvsp[-1].id), (yyvsp[0].nd), (yyvsp[-2].num));
                     }
-#line 7962 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7977 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 63: /* $@5: %empty  */
-#line 2729 "mrbgems/mruby-compiler/core/parse.y"
+#line 2744 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       local_nest(p);
                       nvars_nest(p);
                     }
-#line 7971 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7986 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 64: /* cmd_brace_block: "{" $@5 opt_block_param compstmt '}'  */
-#line 2736 "mrbgems/mruby-compiler/core/parse.y"
+#line 2751 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_block(p, (yyvsp[-2].nd), (yyvsp[-1].nd));
                       local_unnest(p);
                       nvars_unnest(p);
                     }
-#line 7981 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7996 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 65: /* command: operation command_args  */
-#line 2744 "mrbgems/mruby-compiler/core/parse.y"
+#line 2759 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_fcall(p, (yyvsp[-1].id), (yyvsp[0].nd));
                     }
-#line 7989 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8004 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 66: /* command: operation command_args cmd_brace_block  */
-#line 2748 "mrbgems/mruby-compiler/core/parse.y"
+#line 2763 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       args_with_block(p, (yyvsp[-1].nd), (yyvsp[0].nd));
                       (yyval.nd) = new_fcall(p, (yyvsp[-2].id), (yyvsp[-1].nd));
                     }
-#line 7998 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8013 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 67: /* command: primary_value call_op operation2 command_args  */
-#line 2753 "mrbgems/mruby-compiler/core/parse.y"
+#line 2768 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-3].nd), (yyvsp[-1].id), (yyvsp[0].nd), (yyvsp[-2].num));
                     }
-#line 8006 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8021 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 68: /* command: primary_value call_op operation2 command_args cmd_brace_block  */
-#line 2757 "mrbgems/mruby-compiler/core/parse.y"
+#line 2772 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       args_with_block(p, (yyvsp[-1].nd), (yyvsp[0].nd));
                       (yyval.nd) = new_call(p, (yyvsp[-4].nd), (yyvsp[-2].id), (yyvsp[-1].nd), (yyvsp[-3].num));
                    }
-#line 8015 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8030 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 69: /* command: primary_value "::" operation2 command_args  */
-#line 2762 "mrbgems/mruby-compiler/core/parse.y"
+#line 2777 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-3].nd), (yyvsp[-1].id), (yyvsp[0].nd), tCOLON2);
                     }
-#line 8023 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8038 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 70: /* command: primary_value "::" operation2 command_args cmd_brace_block  */
-#line 2766 "mrbgems/mruby-compiler/core/parse.y"
+#line 2781 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       args_with_block(p, (yyvsp[-1].nd), (yyvsp[0].nd));
                       (yyval.nd) = new_call(p, (yyvsp[-4].nd), (yyvsp[-2].id), (yyvsp[-1].nd), tCOLON2);
                     }
-#line 8032 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8047 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 71: /* command: "'super'" command_args  */
-#line 2771 "mrbgems/mruby-compiler/core/parse.y"
+#line 2786 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_super(p, (yyvsp[0].nd));
                     }
-#line 8040 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8055 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 72: /* command: "'yield'" command_args  */
-#line 2775 "mrbgems/mruby-compiler/core/parse.y"
+#line 2790 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_yield(p, (yyvsp[0].nd));
                     }
-#line 8048 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8063 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 73: /* command: "'return'" call_args  */
-#line 2779 "mrbgems/mruby-compiler/core/parse.y"
+#line 2794 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_return(p, ret_args(p, (yyvsp[0].nd)));
                     }
-#line 8056 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8071 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 74: /* command: "'break'" call_args  */
-#line 2783 "mrbgems/mruby-compiler/core/parse.y"
+#line 2798 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_break(p, ret_args(p, (yyvsp[0].nd)));
                     }
-#line 8064 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8079 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 75: /* command: "'next'" call_args  */
-#line 2787 "mrbgems/mruby-compiler/core/parse.y"
+#line 2802 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_next(p, ret_args(p, (yyvsp[0].nd)));
                     }
-#line 8072 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8087 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 76: /* mlhs: mlhs_basic  */
-#line 2793 "mrbgems/mruby-compiler/core/parse.y"
+#line 2808 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[0].nd);
                     }
-#line 8080 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8095 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 77: /* mlhs: tLPAREN mlhs_inner rparen  */
-#line 2797 "mrbgems/mruby-compiler/core/parse.y"
+#line 2812 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-1].nd);
                     }
-#line 8088 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8103 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 79: /* mlhs_inner: tLPAREN mlhs_inner rparen  */
-#line 2804 "mrbgems/mruby-compiler/core/parse.y"
+#line 2819 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-1].nd);
                     }
-#line 8096 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8111 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 80: /* mlhs_basic: mlhs_list  */
-#line 2810 "mrbgems/mruby-compiler/core/parse.y"
+#line 2825 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1((yyvsp[0].nd));
                     }
-#line 8104 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8119 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 81: /* mlhs_basic: mlhs_list mlhs_item  */
-#line 2814 "mrbgems/mruby-compiler/core/parse.y"
+#line 2829 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1(push((yyvsp[-1].nd),(yyvsp[0].nd)));
                     }
-#line 8112 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8127 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 82: /* mlhs_basic: mlhs_list "*" mlhs_node  */
-#line 2818 "mrbgems/mruby-compiler/core/parse.y"
+#line 2833 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list2((yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 8120 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8135 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 83: /* mlhs_basic: mlhs_list "*" mlhs_node ',' mlhs_post  */
-#line 2822 "mrbgems/mruby-compiler/core/parse.y"
+#line 2837 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list3((yyvsp[-4].nd), (yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 8128 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8143 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 84: /* mlhs_basic: mlhs_list "*"  */
-#line 2826 "mrbgems/mruby-compiler/core/parse.y"
+#line 2841 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list2((yyvsp[-1].nd), new_nil(p));
                     }
-#line 8136 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8151 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 85: /* mlhs_basic: mlhs_list "*" ',' mlhs_post  */
-#line 2830 "mrbgems/mruby-compiler/core/parse.y"
+#line 2845 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list3((yyvsp[-3].nd), new_nil(p), (yyvsp[0].nd));
                     }
-#line 8144 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8159 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 86: /* mlhs_basic: "*" mlhs_node  */
-#line 2834 "mrbgems/mruby-compiler/core/parse.y"
+#line 2849 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list2(0, (yyvsp[0].nd));
                     }
-#line 8152 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8167 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 87: /* mlhs_basic: "*" mlhs_node ',' mlhs_post  */
-#line 2838 "mrbgems/mruby-compiler/core/parse.y"
+#line 2853 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list3(0, (yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 8160 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8175 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 88: /* mlhs_basic: "*"  */
-#line 2842 "mrbgems/mruby-compiler/core/parse.y"
+#line 2857 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list2(0, new_nil(p));
                     }
-#line 8168 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8183 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 89: /* mlhs_basic: "*" ',' mlhs_post  */
-#line 2846 "mrbgems/mruby-compiler/core/parse.y"
+#line 2861 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list3(0, new_nil(p), (yyvsp[0].nd));
                     }
-#line 8176 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8191 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 91: /* mlhs_item: tLPAREN mlhs_inner rparen  */
-#line 2853 "mrbgems/mruby-compiler/core/parse.y"
+#line 2868 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_masgn(p, (yyvsp[-1].nd), NULL);
                     }
-#line 8184 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8199 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 92: /* mlhs_list: mlhs_item ','  */
-#line 2859 "mrbgems/mruby-compiler/core/parse.y"
+#line 2874 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1((yyvsp[-1].nd));
                     }
-#line 8192 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8207 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 93: /* mlhs_list: mlhs_list mlhs_item ','  */
-#line 2863 "mrbgems/mruby-compiler/core/parse.y"
+#line 2878 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push((yyvsp[-2].nd), (yyvsp[-1].nd));
                     }
-#line 8200 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8215 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 94: /* mlhs_post: mlhs_item  */
-#line 2869 "mrbgems/mruby-compiler/core/parse.y"
+#line 2884 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1((yyvsp[0].nd));
                     }
-#line 8208 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8223 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 95: /* mlhs_post: mlhs_list mlhs_item  */
-#line 2873 "mrbgems/mruby-compiler/core/parse.y"
+#line 2888 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push((yyvsp[-1].nd), (yyvsp[0].nd));
                     }
-#line 8216 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8231 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 96: /* mlhs_node: variable  */
-#line 2879 "mrbgems/mruby-compiler/core/parse.y"
+#line 2894 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       assignable(p, (yyvsp[0].nd));
                     }
-#line 8224 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8239 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 97: /* mlhs_node: primary_value '[' opt_call_args ']'  */
-#line 2883 "mrbgems/mruby-compiler/core/parse.y"
+#line 2898 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-3].nd), intern_op(aref), (yyvsp[-1].nd), '.');
                     }
-#line 8232 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8247 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 98: /* mlhs_node: primary_value call_op "local variable or method"  */
-#line 2887 "mrbgems/mruby-compiler/core/parse.y"
+#line 2902 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-2].nd), (yyvsp[0].id), 0, (yyvsp[-1].num));
                     }
-#line 8240 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8255 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 99: /* mlhs_node: primary_value "::" "local variable or method"  */
-#line 2891 "mrbgems/mruby-compiler/core/parse.y"
+#line 2906 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-2].nd), (yyvsp[0].id), 0, tCOLON2);
                     }
-#line 8248 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8263 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 100: /* mlhs_node: primary_value call_op "constant"  */
-#line 2895 "mrbgems/mruby-compiler/core/parse.y"
+#line 2910 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-2].nd), (yyvsp[0].id), 0, (yyvsp[-1].num));
                     }
-#line 8256 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8271 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 101: /* mlhs_node: primary_value "::" "constant"  */
-#line 2899 "mrbgems/mruby-compiler/core/parse.y"
+#line 2914 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       if (p->in_def || p->in_single)
                         yyerror(&(yylsp[-2]), p, "dynamic constant assignment");
                       (yyval.nd) = new_colon2(p, (yyvsp[-2].nd), (yyvsp[0].id));
                     }
-#line 8266 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8281 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 102: /* mlhs_node: tCOLON3 "constant"  */
-#line 2905 "mrbgems/mruby-compiler/core/parse.y"
+#line 2920 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       if (p->in_def || p->in_single)
                         yyerror(&(yylsp[-1]), p, "dynamic constant assignment");
                       (yyval.nd) = new_colon3(p, (yyvsp[0].id));
                     }
-#line 8276 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8291 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 103: /* mlhs_node: backref  */
-#line 2911 "mrbgems/mruby-compiler/core/parse.y"
+#line 2926 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       backref_error(p, (yyvsp[0].nd));
                       (yyval.nd) = 0;
                     }
-#line 8285 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8300 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 104: /* lhs: variable  */
-#line 2918 "mrbgems/mruby-compiler/core/parse.y"
+#line 2933 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       assignable(p, (yyvsp[0].nd));
                     }
-#line 8293 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8308 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 105: /* lhs: primary_value '[' opt_call_args ']'  */
-#line 2922 "mrbgems/mruby-compiler/core/parse.y"
+#line 2937 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-3].nd), intern_op(aref), (yyvsp[-1].nd), '.');
                     }
-#line 8301 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8316 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 106: /* lhs: primary_value call_op "local variable or method"  */
-#line 2926 "mrbgems/mruby-compiler/core/parse.y"
+#line 2941 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-2].nd), (yyvsp[0].id), 0, (yyvsp[-1].num));
                     }
-#line 8309 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8324 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 107: /* lhs: primary_value "::" "local variable or method"  */
-#line 2930 "mrbgems/mruby-compiler/core/parse.y"
+#line 2945 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-2].nd), (yyvsp[0].id), 0, tCOLON2);
                     }
-#line 8317 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8332 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 108: /* lhs: primary_value call_op "constant"  */
-#line 2934 "mrbgems/mruby-compiler/core/parse.y"
+#line 2949 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-2].nd), (yyvsp[0].id), 0, (yyvsp[-1].num));
                     }
-#line 8325 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8340 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 109: /* lhs: primary_value "::" "constant"  */
-#line 2938 "mrbgems/mruby-compiler/core/parse.y"
+#line 2953 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       if (p->in_def || p->in_single)
                         yyerror(&(yylsp[-2]), p, "dynamic constant assignment");
                       (yyval.nd) = new_colon2(p, (yyvsp[-2].nd), (yyvsp[0].id));
                     }
-#line 8335 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8350 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 110: /* lhs: tCOLON3 "constant"  */
-#line 2944 "mrbgems/mruby-compiler/core/parse.y"
+#line 2959 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       if (p->in_def || p->in_single)
                         yyerror(&(yylsp[-1]), p, "dynamic constant assignment");
                       (yyval.nd) = new_colon3(p, (yyvsp[0].id));
                     }
-#line 8345 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8360 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 111: /* lhs: backref  */
-#line 2950 "mrbgems/mruby-compiler/core/parse.y"
+#line 2965 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       backref_error(p, (yyvsp[0].nd));
                       (yyval.nd) = 0;
                     }
-#line 8354 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8369 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 112: /* lhs: "numbered parameter"  */
-#line 2955 "mrbgems/mruby-compiler/core/parse.y"
+#line 2970 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       yyerror(&(yylsp[0]), p, "can't assign to numbered parameter");
                     }
-#line 8362 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8377 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 113: /* cname: "local variable or method"  */
-#line 2961 "mrbgems/mruby-compiler/core/parse.y"
+#line 2976 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       yyerror(&(yylsp[0]), p, "class/module name must be CONSTANT");
                     }
-#line 8370 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8385 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 115: /* cpath: tCOLON3 cname  */
-#line 2968 "mrbgems/mruby-compiler/core/parse.y"
+#line 2983 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = cons(int_to_node(1), sym_to_node((yyvsp[0].id)));
                     }
-#line 8378 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8393 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 116: /* cpath: cname  */
-#line 2972 "mrbgems/mruby-compiler/core/parse.y"
+#line 2987 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = cons(int_to_node(0), sym_to_node((yyvsp[0].id)));
                     }
-#line 8386 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8401 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 117: /* cpath: primary_value "::" cname  */
-#line 2976 "mrbgems/mruby-compiler/core/parse.y"
+#line 2991 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       void_expr_error(p, (yyvsp[-2].nd));
                       (yyval.nd) = cons((yyvsp[-2].nd), sym_to_node((yyvsp[0].id)));
                     }
-#line 8395 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8410 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 121: /* fname: op  */
-#line 2986 "mrbgems/mruby-compiler/core/parse.y"
+#line 3001 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       p->lstate = EXPR_ENDFN;
                       (yyval.id) = (yyvsp[0].id);
                     }
-#line 8404 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8419 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 122: /* fname: reswords  */
-#line 2991 "mrbgems/mruby-compiler/core/parse.y"
+#line 3006 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       p->lstate = EXPR_ENDFN;
                       (yyval.id) = (yyvsp[0].id);
                     }
-#line 8413 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8428 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 125: /* undef_list: fsym  */
-#line 3002 "mrbgems/mruby-compiler/core/parse.y"
+#line 3017 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = cons(sym_to_node((yyvsp[0].id)), 0);
                     }
-#line 8421 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8436 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 126: /* $@6: %empty  */
-#line 3005 "mrbgems/mruby-compiler/core/parse.y"
+#line 3020 "mrbgems/mruby-compiler/core/parse.y"
                                  {p->lstate = EXPR_FNAME;}
-#line 8427 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8442 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 127: /* undef_list: undef_list ',' $@6 fsym  */
-#line 3006 "mrbgems/mruby-compiler/core/parse.y"
+#line 3021 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push((yyvsp[-3].nd), sym_to_node((yyvsp[0].id)));
                     }
-#line 8435 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8450 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 128: /* op: '|'  */
-#line 3011 "mrbgems/mruby-compiler/core/parse.y"
+#line 3026 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(or);     }
-#line 8441 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8456 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 129: /* op: '^'  */
-#line 3012 "mrbgems/mruby-compiler/core/parse.y"
+#line 3027 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(xor);    }
-#line 8447 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8462 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 130: /* op: '&'  */
-#line 3013 "mrbgems/mruby-compiler/core/parse.y"
+#line 3028 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(and);    }
-#line 8453 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8468 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 131: /* op: "<=>"  */
-#line 3014 "mrbgems/mruby-compiler/core/parse.y"
+#line 3029 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(cmp);    }
-#line 8459 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8474 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 132: /* op: "=="  */
-#line 3015 "mrbgems/mruby-compiler/core/parse.y"
+#line 3030 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(eq);     }
-#line 8465 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8480 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 133: /* op: "==="  */
-#line 3016 "mrbgems/mruby-compiler/core/parse.y"
+#line 3031 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(eqq);    }
-#line 8471 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8486 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 134: /* op: "=~"  */
-#line 3017 "mrbgems/mruby-compiler/core/parse.y"
+#line 3032 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(match);  }
-#line 8477 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8492 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 135: /* op: "!~"  */
-#line 3018 "mrbgems/mruby-compiler/core/parse.y"
+#line 3033 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(nmatch); }
-#line 8483 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8498 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 136: /* op: '>'  */
-#line 3019 "mrbgems/mruby-compiler/core/parse.y"
+#line 3034 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(gt);     }
-#line 8489 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8504 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 137: /* op: ">="  */
-#line 3020 "mrbgems/mruby-compiler/core/parse.y"
+#line 3035 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(ge);     }
-#line 8495 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8510 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 138: /* op: '<'  */
-#line 3021 "mrbgems/mruby-compiler/core/parse.y"
+#line 3036 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(lt);     }
-#line 8501 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8516 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 139: /* op: "<="  */
-#line 3022 "mrbgems/mruby-compiler/core/parse.y"
+#line 3037 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(le);     }
-#line 8507 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8522 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 140: /* op: "!="  */
-#line 3023 "mrbgems/mruby-compiler/core/parse.y"
+#line 3038 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(neq);    }
-#line 8513 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8528 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 141: /* op: "<<"  */
-#line 3024 "mrbgems/mruby-compiler/core/parse.y"
+#line 3039 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(lshift); }
-#line 8519 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8534 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 142: /* op: ">>"  */
-#line 3025 "mrbgems/mruby-compiler/core/parse.y"
+#line 3040 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(rshift); }
-#line 8525 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8540 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 143: /* op: '+'  */
-#line 3026 "mrbgems/mruby-compiler/core/parse.y"
+#line 3041 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(add);    }
-#line 8531 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8546 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 144: /* op: '-'  */
-#line 3027 "mrbgems/mruby-compiler/core/parse.y"
+#line 3042 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(sub);    }
-#line 8537 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8552 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 145: /* op: '*'  */
-#line 3028 "mrbgems/mruby-compiler/core/parse.y"
+#line 3043 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(mul);    }
-#line 8543 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8558 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 146: /* op: "*"  */
-#line 3029 "mrbgems/mruby-compiler/core/parse.y"
+#line 3044 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(mul);    }
-#line 8549 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8564 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 147: /* op: '/'  */
-#line 3030 "mrbgems/mruby-compiler/core/parse.y"
+#line 3045 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(div);    }
-#line 8555 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8570 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 148: /* op: '%'  */
-#line 3031 "mrbgems/mruby-compiler/core/parse.y"
+#line 3046 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(mod);    }
-#line 8561 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8576 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 149: /* op: tPOW  */
-#line 3032 "mrbgems/mruby-compiler/core/parse.y"
+#line 3047 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(pow);    }
-#line 8567 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8582 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 150: /* op: "**"  */
-#line 3033 "mrbgems/mruby-compiler/core/parse.y"
+#line 3048 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(pow);    }
-#line 8573 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8588 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 151: /* op: '!'  */
-#line 3034 "mrbgems/mruby-compiler/core/parse.y"
+#line 3049 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(not);    }
-#line 8579 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8594 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 152: /* op: '~'  */
-#line 3035 "mrbgems/mruby-compiler/core/parse.y"
+#line 3050 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(neg);    }
-#line 8585 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8600 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 153: /* op: "unary plus"  */
-#line 3036 "mrbgems/mruby-compiler/core/parse.y"
+#line 3051 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(plus);   }
-#line 8591 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8606 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 154: /* op: "unary minus"  */
-#line 3037 "mrbgems/mruby-compiler/core/parse.y"
+#line 3052 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(minus);  }
-#line 8597 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8612 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 155: /* op: tAREF  */
-#line 3038 "mrbgems/mruby-compiler/core/parse.y"
+#line 3053 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(aref);   }
-#line 8603 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8618 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 156: /* op: tASET  */
-#line 3039 "mrbgems/mruby-compiler/core/parse.y"
+#line 3054 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(aset);   }
-#line 8609 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8624 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 157: /* op: '`'  */
-#line 3040 "mrbgems/mruby-compiler/core/parse.y"
+#line 3055 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(tick);   }
-#line 8615 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8630 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 198: /* arg: lhs '=' arg_rhs  */
-#line 3058 "mrbgems/mruby-compiler/core/parse.y"
+#line 3073 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_asgn(p, (yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 8623 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8638 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 199: /* arg: var_lhs tOP_ASGN arg_rhs  */
-#line 3062 "mrbgems/mruby-compiler/core/parse.y"
+#line 3077 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_op_asgn(p, (yyvsp[-2].nd), (yyvsp[-1].id), (yyvsp[0].nd));
                     }
-#line 8631 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8646 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 200: /* arg: primary_value '[' opt_call_args ']' tOP_ASGN arg_rhs  */
-#line 3066 "mrbgems/mruby-compiler/core/parse.y"
+#line 3081 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_op_asgn(p, new_call(p, (yyvsp[-5].nd), intern_op(aref), (yyvsp[-3].nd), '.'), (yyvsp[-1].id), (yyvsp[0].nd));
                     }
-#line 8639 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8654 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 201: /* arg: primary_value call_op "local variable or method" tOP_ASGN arg_rhs  */
-#line 3070 "mrbgems/mruby-compiler/core/parse.y"
+#line 3085 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_op_asgn(p, new_call(p, (yyvsp[-4].nd), (yyvsp[-2].id), 0, (yyvsp[-3].num)), (yyvsp[-1].id), (yyvsp[0].nd));
                     }
-#line 8647 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8662 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 202: /* arg: primary_value call_op "constant" tOP_ASGN arg_rhs  */
-#line 3074 "mrbgems/mruby-compiler/core/parse.y"
+#line 3089 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_op_asgn(p, new_call(p, (yyvsp[-4].nd), (yyvsp[-2].id), 0, (yyvsp[-3].num)), (yyvsp[-1].id), (yyvsp[0].nd));
                     }
-#line 8655 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8670 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 203: /* arg: primary_value "::" "local variable or method" tOP_ASGN arg_rhs  */
-#line 3078 "mrbgems/mruby-compiler/core/parse.y"
+#line 3093 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_op_asgn(p, new_call(p, (yyvsp[-4].nd), (yyvsp[-2].id), 0, tCOLON2), (yyvsp[-1].id), (yyvsp[0].nd));
                     }
-#line 8663 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8678 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 204: /* arg: primary_value "::" "constant" tOP_ASGN arg_rhs  */
-#line 3082 "mrbgems/mruby-compiler/core/parse.y"
+#line 3097 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       yyerror(&(yylsp[-4]), p, "constant re-assignment");
                       (yyval.nd) = new_stmts(p, 0);
                     }
-#line 8672 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8687 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 205: /* arg: tCOLON3 "constant" tOP_ASGN arg_rhs  */
-#line 3087 "mrbgems/mruby-compiler/core/parse.y"
+#line 3102 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       yyerror(&(yylsp[-3]), p, "constant re-assignment");
                       (yyval.nd) = new_stmts(p, 0);
                     }
-#line 8681 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8696 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 206: /* arg: backref tOP_ASGN arg_rhs  */
-#line 3092 "mrbgems/mruby-compiler/core/parse.y"
+#line 3107 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       backref_error(p, (yyvsp[-2].nd));
                       (yyval.nd) = new_stmts(p, 0);
                     }
-#line 8690 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8705 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 207: /* arg: arg ".." arg  */
-#line 3097 "mrbgems/mruby-compiler/core/parse.y"
+#line 3112 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_dot2(p, (yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 8698 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8713 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 208: /* arg: arg ".."  */
-#line 3101 "mrbgems/mruby-compiler/core/parse.y"
+#line 3116 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_dot2(p, (yyvsp[-1].nd), new_nil(p));
                     }
-#line 8706 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8721 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 209: /* arg: tBDOT2 arg  */
-#line 3105 "mrbgems/mruby-compiler/core/parse.y"
+#line 3120 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_dot2(p, new_nil(p), (yyvsp[0].nd));
                     }
-#line 8714 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8729 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 210: /* arg: arg "..." arg  */
-#line 3109 "mrbgems/mruby-compiler/core/parse.y"
+#line 3124 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_dot3(p, (yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 8722 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8737 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 211: /* arg: arg "..."  */
-#line 3113 "mrbgems/mruby-compiler/core/parse.y"
+#line 3128 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_dot3(p, (yyvsp[-1].nd), new_nil(p));
                     }
-#line 8730 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8745 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 212: /* arg: tBDOT3 arg  */
-#line 3117 "mrbgems/mruby-compiler/core/parse.y"
+#line 3132 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_dot3(p, new_nil(p), (yyvsp[0].nd));
                     }
-#line 8738 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8753 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 213: /* arg: arg '+' arg  */
-#line 3121 "mrbgems/mruby-compiler/core/parse.y"
+#line 3136 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "+", (yyvsp[0].nd));
                     }
-#line 8746 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8761 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 214: /* arg: arg '-' arg  */
-#line 3125 "mrbgems/mruby-compiler/core/parse.y"
+#line 3140 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "-", (yyvsp[0].nd));
                     }
-#line 8754 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8769 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 215: /* arg: arg '*' arg  */
-#line 3129 "mrbgems/mruby-compiler/core/parse.y"
+#line 3144 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "*", (yyvsp[0].nd));
                     }
-#line 8762 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8777 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 216: /* arg: arg '/' arg  */
-#line 3133 "mrbgems/mruby-compiler/core/parse.y"
+#line 3148 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "/", (yyvsp[0].nd));
                     }
-#line 8770 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8785 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 217: /* arg: arg '%' arg  */
-#line 3137 "mrbgems/mruby-compiler/core/parse.y"
+#line 3152 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "%", (yyvsp[0].nd));
                     }
-#line 8778 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8793 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 218: /* arg: arg tPOW arg  */
-#line 3141 "mrbgems/mruby-compiler/core/parse.y"
+#line 3156 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "**", (yyvsp[0].nd));
                     }
-#line 8786 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8801 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 219: /* arg: tUMINUS_NUM "integer literal" tPOW arg  */
-#line 3145 "mrbgems/mruby-compiler/core/parse.y"
+#line 3160 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_negate(p, call_bin_op(p, (yyvsp[-2].nd), "**", (yyvsp[0].nd)));
                     }
-#line 8794 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8809 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 220: /* arg: tUMINUS_NUM "float literal" tPOW arg  */
-#line 3149 "mrbgems/mruby-compiler/core/parse.y"
+#line 3164 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_negate(p, call_bin_op(p, (yyvsp[-2].nd), "**", (yyvsp[0].nd)));
                     }
-#line 8802 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8817 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 221: /* arg: "unary plus" arg  */
-#line 3153 "mrbgems/mruby-compiler/core/parse.y"
+#line 3168 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_uni_op(p, (yyvsp[0].nd), "+@");
                     }
-#line 8810 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8825 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 222: /* arg: "unary minus" arg  */
-#line 3157 "mrbgems/mruby-compiler/core/parse.y"
+#line 3172 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_negate(p, (yyvsp[0].nd));
                     }
-#line 8818 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8833 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 223: /* arg: arg '|' arg  */
-#line 3161 "mrbgems/mruby-compiler/core/parse.y"
+#line 3176 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "|", (yyvsp[0].nd));
                     }
-#line 8826 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8841 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 224: /* arg: arg '^' arg  */
-#line 3165 "mrbgems/mruby-compiler/core/parse.y"
+#line 3180 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "^", (yyvsp[0].nd));
                     }
-#line 8834 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8849 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 225: /* arg: arg '&' arg  */
-#line 3169 "mrbgems/mruby-compiler/core/parse.y"
+#line 3184 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "&", (yyvsp[0].nd));
                     }
-#line 8842 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8857 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 226: /* arg: arg "<=>" arg  */
-#line 3173 "mrbgems/mruby-compiler/core/parse.y"
+#line 3188 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "<=>", (yyvsp[0].nd));
                     }
-#line 8850 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8865 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 227: /* arg: arg '>' arg  */
-#line 3177 "mrbgems/mruby-compiler/core/parse.y"
+#line 3192 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), ">", (yyvsp[0].nd));
                     }
-#line 8858 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8873 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 228: /* arg: arg ">=" arg  */
-#line 3181 "mrbgems/mruby-compiler/core/parse.y"
+#line 3196 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), ">=", (yyvsp[0].nd));
                     }
-#line 8866 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8881 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 229: /* arg: arg '<' arg  */
-#line 3185 "mrbgems/mruby-compiler/core/parse.y"
+#line 3200 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "<", (yyvsp[0].nd));
                     }
-#line 8874 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8889 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 230: /* arg: arg "<=" arg  */
-#line 3189 "mrbgems/mruby-compiler/core/parse.y"
+#line 3204 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "<=", (yyvsp[0].nd));
                     }
-#line 8882 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8897 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 231: /* arg: arg "==" arg  */
-#line 3193 "mrbgems/mruby-compiler/core/parse.y"
+#line 3208 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "==", (yyvsp[0].nd));
                     }
-#line 8890 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8905 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 232: /* arg: arg "===" arg  */
-#line 3197 "mrbgems/mruby-compiler/core/parse.y"
+#line 3212 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "===", (yyvsp[0].nd));
                     }
-#line 8898 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8913 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 233: /* arg: arg "!=" arg  */
-#line 3201 "mrbgems/mruby-compiler/core/parse.y"
+#line 3216 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "!=", (yyvsp[0].nd));
                     }
-#line 8906 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8921 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 234: /* arg: arg "=~" arg  */
-#line 3205 "mrbgems/mruby-compiler/core/parse.y"
+#line 3220 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "=~", (yyvsp[0].nd));
                     }
-#line 8914 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8929 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 235: /* arg: arg "!~" arg  */
-#line 3209 "mrbgems/mruby-compiler/core/parse.y"
+#line 3224 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "!~", (yyvsp[0].nd));
                     }
-#line 8922 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8937 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 236: /* arg: '!' arg  */
-#line 3213 "mrbgems/mruby-compiler/core/parse.y"
+#line 3228 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_uni_op(p, cond((yyvsp[0].nd)), "!");
                     }
-#line 8930 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8945 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 237: /* arg: '~' arg  */
-#line 3217 "mrbgems/mruby-compiler/core/parse.y"
+#line 3232 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_uni_op(p, cond((yyvsp[0].nd)), "~");
                     }
-#line 8938 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8953 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 238: /* arg: arg "<<" arg  */
-#line 3221 "mrbgems/mruby-compiler/core/parse.y"
+#line 3236 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "<<", (yyvsp[0].nd));
                     }
-#line 8946 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8961 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 239: /* arg: arg ">>" arg  */
-#line 3225 "mrbgems/mruby-compiler/core/parse.y"
+#line 3240 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), ">>", (yyvsp[0].nd));
                     }
-#line 8954 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8969 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 240: /* arg: arg "&&" arg  */
-#line 3229 "mrbgems/mruby-compiler/core/parse.y"
+#line 3244 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_and(p, (yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 8962 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8977 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 241: /* arg: arg "||" arg  */
-#line 3233 "mrbgems/mruby-compiler/core/parse.y"
+#line 3248 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_or(p, (yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 8970 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8985 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 242: /* arg: arg '?' arg opt_nl ':' arg  */
-#line 3237 "mrbgems/mruby-compiler/core/parse.y"
+#line 3252 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_if(p, cond((yyvsp[-5].nd)), (yyvsp[-3].nd), (yyvsp[0].nd));
                     }
-#line 8978 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8993 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 243: /* arg: arg '?' arg opt_nl "label" arg  */
-#line 3241 "mrbgems/mruby-compiler/core/parse.y"
+#line 3256 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_if(p, cond((yyvsp[-5].nd)), (yyvsp[-3].nd), (yyvsp[0].nd));
                     }
-#line 8986 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9001 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 244: /* arg: defn_head f_opt_arglist_paren '=' arg  */
-#line 3245 "mrbgems/mruby-compiler/core/parse.y"
+#line 3260 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-3].nd);
                       endless_method_name(p, (yyvsp[-3].nd));
@@ -8995,11 +9010,11 @@ yyreduce:
                       nvars_unnest(p);
                       p->in_def--;
                     }
-#line 8999 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9014 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 245: /* arg: defn_head f_opt_arglist_paren '=' arg "'rescue' modifier" arg  */
-#line 3254 "mrbgems/mruby-compiler/core/parse.y"
+#line 3269 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-5].nd);
                       endless_method_name(p, (yyvsp[-5].nd));
@@ -9008,11 +9023,11 @@ yyreduce:
                       nvars_unnest(p);
                       p->in_def--;
                     }
-#line 9012 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9027 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 246: /* arg: defs_head f_opt_arglist_paren '=' arg  */
-#line 3263 "mrbgems/mruby-compiler/core/parse.y"
+#line 3278 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-3].nd);
                       void_expr_error(p, (yyvsp[0].nd));
@@ -9021,11 +9036,11 @@ yyreduce:
                       p->in_def--;
                       p->in_single--;
                     }
-#line 9025 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9040 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 247: /* arg: defs_head f_opt_arglist_paren '=' arg "'rescue' modifier" arg  */
-#line 3272 "mrbgems/mruby-compiler/core/parse.y"
+#line 3287 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-5].nd);
                       void_expr_error(p, (yyvsp[-2].nd));
@@ -9034,68 +9049,68 @@ yyreduce:
                       p->in_def--;
                       p->in_single--;
                     }
-#line 9038 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9053 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 248: /* arg: primary  */
-#line 3281 "mrbgems/mruby-compiler/core/parse.y"
+#line 3296 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[0].nd);
                     }
-#line 9046 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9061 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 250: /* aref_args: args trailer  */
-#line 3288 "mrbgems/mruby-compiler/core/parse.y"
+#line 3303 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-1].nd);
                     }
-#line 9054 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9069 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 251: /* aref_args: args comma assocs trailer  */
-#line 3292 "mrbgems/mruby-compiler/core/parse.y"
+#line 3307 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push((yyvsp[-3].nd), new_hash(p, (yyvsp[-1].nd)));
                     }
-#line 9062 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9077 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 252: /* aref_args: assocs trailer  */
-#line 3296 "mrbgems/mruby-compiler/core/parse.y"
+#line 3311 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = cons(new_kw_hash(p, (yyvsp[-1].nd)), 0);
                     }
-#line 9070 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9085 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 253: /* arg_rhs: arg  */
-#line 3302 "mrbgems/mruby-compiler/core/parse.y"
+#line 3317 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[0].nd);
                     }
-#line 9078 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9093 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 254: /* arg_rhs: arg "'rescue' modifier" arg  */
-#line 3306 "mrbgems/mruby-compiler/core/parse.y"
+#line 3321 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       void_expr_error(p, (yyvsp[-2].nd));
                       (yyval.nd) = new_mod_rescue(p, (yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 9087 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9102 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 255: /* paren_args: '(' opt_call_args ')'  */
-#line 3313 "mrbgems/mruby-compiler/core/parse.y"
+#line 3328 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-1].nd);
                     }
-#line 9095 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9110 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 256: /* paren_args: '(' args comma tBDOT3 rparen  */
-#line 3317 "mrbgems/mruby-compiler/core/parse.y"
+#line 3332 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       mrb_sym r = intern_op(mul);
                       mrb_sym k = intern_op(pow);
@@ -9104,11 +9119,11 @@ yyreduce:
                                         new_kw_hash(p, list1(cons(new_kw_rest_args(p, 0), new_xvar(p, k, NODE_LVAR)))),
                                         new_block_arg(p, new_xvar(p, b, NODE_LVAR)));
                     }
-#line 9108 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9123 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 257: /* paren_args: '(' tBDOT3 rparen  */
-#line 3326 "mrbgems/mruby-compiler/core/parse.y"
+#line 3341 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       mrb_sym r = intern_op(mul);
                       mrb_sym k = intern_op(pow);
@@ -9123,390 +9138,390 @@ yyreduce:
                         (yyval.nd) = 0;
                       }
                     }
-#line 9127 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9142 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 262: /* opt_call_args: args comma  */
-#line 3349 "mrbgems/mruby-compiler/core/parse.y"
+#line 3364 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_callargs(p,(yyvsp[-1].nd),0,0);
                     }
-#line 9135 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9150 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 263: /* opt_call_args: args comma assocs comma  */
-#line 3353 "mrbgems/mruby-compiler/core/parse.y"
+#line 3368 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_callargs(p,(yyvsp[-3].nd),new_kw_hash(p,(yyvsp[-1].nd)),0);
                     }
-#line 9143 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9158 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 264: /* opt_call_args: assocs comma  */
-#line 3357 "mrbgems/mruby-compiler/core/parse.y"
+#line 3372 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_callargs(p,0,new_kw_hash(p,(yyvsp[-1].nd)),0);
                     }
-#line 9151 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9166 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 265: /* call_args: command  */
-#line 3363 "mrbgems/mruby-compiler/core/parse.y"
+#line 3378 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       void_expr_error(p, (yyvsp[0].nd));
                       (yyval.nd) = new_callargs(p, list1((yyvsp[0].nd)), 0, 0);
                     }
-#line 9160 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9175 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 266: /* call_args: args opt_block_arg  */
-#line 3368 "mrbgems/mruby-compiler/core/parse.y"
+#line 3383 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_callargs(p, (yyvsp[-1].nd), 0, (yyvsp[0].nd));
                     }
-#line 9168 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9183 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 267: /* call_args: assocs opt_block_arg  */
-#line 3372 "mrbgems/mruby-compiler/core/parse.y"
+#line 3387 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_callargs(p, 0, new_kw_hash(p, (yyvsp[-1].nd)), (yyvsp[0].nd));
                     }
-#line 9176 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9191 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 268: /* call_args: args comma assocs opt_block_arg  */
-#line 3376 "mrbgems/mruby-compiler/core/parse.y"
+#line 3391 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_callargs(p, (yyvsp[-3].nd), new_kw_hash(p, (yyvsp[-1].nd)), (yyvsp[0].nd));
                     }
-#line 9184 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9199 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 269: /* call_args: block_arg  */
-#line 3380 "mrbgems/mruby-compiler/core/parse.y"
+#line 3395 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_callargs(p, 0, 0, (yyvsp[0].nd));
                     }
-#line 9192 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9207 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 270: /* @7: %empty  */
-#line 3385 "mrbgems/mruby-compiler/core/parse.y"
+#line 3400 "mrbgems/mruby-compiler/core/parse.y"
                    {
                       (yyval.stack) = p->cmdarg_stack;
                       CMDARG_PUSH(1);
                     }
-#line 9201 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9216 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 271: /* command_args: @7 call_args  */
-#line 3390 "mrbgems/mruby-compiler/core/parse.y"
+#line 3405 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       p->cmdarg_stack = (yyvsp[-1].stack);
                       (yyval.nd) = (yyvsp[0].nd);
                     }
-#line 9210 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9225 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 272: /* block_arg: "&" arg  */
-#line 3397 "mrbgems/mruby-compiler/core/parse.y"
+#line 3412 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_block_arg(p, (yyvsp[0].nd));
                     }
-#line 9218 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9233 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 273: /* block_arg: "&"  */
-#line 3401 "mrbgems/mruby-compiler/core/parse.y"
+#line 3416 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_block_arg(p, 0);
                     }
-#line 9226 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9241 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 274: /* opt_block_arg: comma block_arg  */
-#line 3407 "mrbgems/mruby-compiler/core/parse.y"
+#line 3422 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[0].nd);
                     }
-#line 9234 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9249 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 275: /* opt_block_arg: none  */
-#line 3411 "mrbgems/mruby-compiler/core/parse.y"
+#line 3426 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = 0;
                     }
-#line 9242 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9257 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 277: /* args: arg  */
-#line 3420 "mrbgems/mruby-compiler/core/parse.y"
+#line 3435 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       void_expr_error(p, (yyvsp[0].nd));
                       (yyval.nd) = list1((yyvsp[0].nd));
                     }
-#line 9251 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9266 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 278: /* args: "*"  */
-#line 3425 "mrbgems/mruby-compiler/core/parse.y"
+#line 3440 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1(new_splat(p, new_xvar(p, intern_op(mul), NODE_LVAR)));
                     }
-#line 9259 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9274 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 279: /* args: "*" arg  */
-#line 3429 "mrbgems/mruby-compiler/core/parse.y"
+#line 3444 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1(new_splat(p, (yyvsp[0].nd)));
                     }
-#line 9267 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9282 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 280: /* args: args comma arg  */
-#line 3433 "mrbgems/mruby-compiler/core/parse.y"
-                    {
-                      void_expr_error(p, (yyvsp[0].nd));
-                      (yyval.nd) = push((yyvsp[-2].nd), (yyvsp[0].nd));
-                    }
-#line 9276 "mrbgems/mruby-compiler/core/y.tab.c"
-    break;
-
-  case 281: /* args: args comma "*"  */
-#line 3438 "mrbgems/mruby-compiler/core/parse.y"
-                    {
-                      (yyval.nd) = push((yyvsp[-2].nd), new_splat(p, new_xvar(p, intern_op(mul), NODE_LVAR)));
-                    }
-#line 9284 "mrbgems/mruby-compiler/core/y.tab.c"
-    break;
-
-  case 282: /* args: args comma "*" arg  */
-#line 3442 "mrbgems/mruby-compiler/core/parse.y"
-                    {
-                      (yyval.nd) = push((yyvsp[-3].nd), new_splat(p, (yyvsp[0].nd)));
-                    }
-#line 9292 "mrbgems/mruby-compiler/core/y.tab.c"
-    break;
-
-  case 283: /* mrhs: args comma arg  */
 #line 3448 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       void_expr_error(p, (yyvsp[0].nd));
                       (yyval.nd) = push((yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 9301 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9291 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
-  case 284: /* mrhs: args comma "*" arg  */
+  case 281: /* args: args comma "*"  */
 #line 3453 "mrbgems/mruby-compiler/core/parse.y"
+                    {
+                      (yyval.nd) = push((yyvsp[-2].nd), new_splat(p, new_xvar(p, intern_op(mul), NODE_LVAR)));
+                    }
+#line 9299 "mrbgems/mruby-compiler/core/y.tab.c"
+    break;
+
+  case 282: /* args: args comma "*" arg  */
+#line 3457 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push((yyvsp[-3].nd), new_splat(p, (yyvsp[0].nd)));
                     }
-#line 9309 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9307 "mrbgems/mruby-compiler/core/y.tab.c"
+    break;
+
+  case 283: /* mrhs: args comma arg  */
+#line 3463 "mrbgems/mruby-compiler/core/parse.y"
+                    {
+                      void_expr_error(p, (yyvsp[0].nd));
+                      (yyval.nd) = push((yyvsp[-2].nd), (yyvsp[0].nd));
+                    }
+#line 9316 "mrbgems/mruby-compiler/core/y.tab.c"
+    break;
+
+  case 284: /* mrhs: args comma "*" arg  */
+#line 3468 "mrbgems/mruby-compiler/core/parse.y"
+                    {
+                      (yyval.nd) = push((yyvsp[-3].nd), new_splat(p, (yyvsp[0].nd)));
+                    }
+#line 9324 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 285: /* mrhs: "*" arg  */
-#line 3457 "mrbgems/mruby-compiler/core/parse.y"
+#line 3472 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1(new_splat(p, (yyvsp[0].nd)));
                     }
-#line 9317 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9332 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 287: /* primary: string  */
-#line 3464 "mrbgems/mruby-compiler/core/parse.y"
+#line 3479 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_str(p, (yyvsp[0].nd));
                     }
-#line 9325 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9340 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 288: /* primary: xstring  */
-#line 3468 "mrbgems/mruby-compiler/core/parse.y"
+#line 3483 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_xstr(p, (yyvsp[0].nd));
                     }
-#line 9333 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9348 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 293: /* primary: "method"  */
-#line 3476 "mrbgems/mruby-compiler/core/parse.y"
+#line 3491 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_fcall(p, (yyvsp[0].id), 0);
                     }
-#line 9341 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9356 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 294: /* @8: %empty  */
-#line 3480 "mrbgems/mruby-compiler/core/parse.y"
+#line 3495 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.stack) = p->cmdarg_stack;
                       p->cmdarg_stack = 0;
                     }
-#line 9350 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9365 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 295: /* primary: "'begin'" @8 bodystmt "'end'"  */
-#line 3486 "mrbgems/mruby-compiler/core/parse.y"
+#line 3501 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       p->cmdarg_stack = (yyvsp[-2].stack);
                       (yyval.nd) = new_begin(p, (yyvsp[-1].nd));
                     }
-#line 9359 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9374 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 296: /* @9: %empty  */
-#line 3491 "mrbgems/mruby-compiler/core/parse.y"
+#line 3506 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.stack) = p->cmdarg_stack;
                       p->cmdarg_stack = 0;
                     }
-#line 9368 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9383 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 297: /* $@10: %empty  */
-#line 3495 "mrbgems/mruby-compiler/core/parse.y"
+#line 3510 "mrbgems/mruby-compiler/core/parse.y"
                        {p->lstate = EXPR_ENDARG;}
-#line 9374 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9389 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 298: /* primary: "(" @9 stmt $@10 rparen  */
-#line 3496 "mrbgems/mruby-compiler/core/parse.y"
+#line 3511 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       p->cmdarg_stack = (yyvsp[-3].stack);
                       (yyval.nd) = (yyvsp[-2].nd);
                     }
-#line 9383 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9398 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 299: /* $@11: %empty  */
-#line 3500 "mrbgems/mruby-compiler/core/parse.y"
+#line 3515 "mrbgems/mruby-compiler/core/parse.y"
                               {p->lstate = EXPR_ENDARG;}
-#line 9389 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9404 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 300: /* primary: "(" $@11 rparen  */
-#line 3501 "mrbgems/mruby-compiler/core/parse.y"
+#line 3516 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_nil(p);
                     }
-#line 9397 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9412 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 301: /* primary: tLPAREN compstmt ')'  */
-#line 3505 "mrbgems/mruby-compiler/core/parse.y"
+#line 3520 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-1].nd);
                     }
-#line 9405 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9420 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 302: /* primary: primary_value "::" "constant"  */
-#line 3509 "mrbgems/mruby-compiler/core/parse.y"
+#line 3524 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_colon2(p, (yyvsp[-2].nd), (yyvsp[0].id));
                     }
-#line 9413 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9428 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 303: /* primary: tCOLON3 "constant"  */
-#line 3513 "mrbgems/mruby-compiler/core/parse.y"
+#line 3528 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_colon3(p, (yyvsp[0].id));
                     }
-#line 9421 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9436 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 304: /* primary: "[" aref_args ']'  */
-#line 3517 "mrbgems/mruby-compiler/core/parse.y"
+#line 3532 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_array(p, (yyvsp[-1].nd));
                     }
-#line 9429 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9444 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 305: /* primary: tLBRACE assoc_list '}'  */
-#line 3521 "mrbgems/mruby-compiler/core/parse.y"
+#line 3536 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_hash(p, (yyvsp[-1].nd));
                     }
-#line 9437 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9452 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 306: /* primary: "'return'"  */
-#line 3525 "mrbgems/mruby-compiler/core/parse.y"
+#line 3540 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_return(p, 0);
                     }
-#line 9445 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9460 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 307: /* primary: "'yield'" opt_paren_args  */
-#line 3529 "mrbgems/mruby-compiler/core/parse.y"
+#line 3544 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_yield(p, (yyvsp[0].nd));
                     }
-#line 9453 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9468 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 308: /* primary: "'not'" '(' expr rparen  */
-#line 3533 "mrbgems/mruby-compiler/core/parse.y"
+#line 3548 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_uni_op(p, cond((yyvsp[-1].nd)), "!");
                     }
-#line 9461 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9476 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 309: /* primary: "'not'" '(' rparen  */
-#line 3537 "mrbgems/mruby-compiler/core/parse.y"
+#line 3552 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_uni_op(p, new_nil(p), "!");
                     }
-#line 9469 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9484 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 310: /* primary: operation brace_block  */
-#line 3541 "mrbgems/mruby-compiler/core/parse.y"
+#line 3556 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_fcall(p, (yyvsp[-1].id), new_callargs(p, 0, 0, (yyvsp[0].nd)));
                     }
-#line 9477 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9492 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 312: /* primary: method_call brace_block  */
-#line 3546 "mrbgems/mruby-compiler/core/parse.y"
+#line 3561 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       call_with_block(p, (yyvsp[-1].nd), (yyvsp[0].nd));
                       (yyval.nd) = (yyvsp[-1].nd);
                     }
-#line 9486 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9501 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 313: /* @12: %empty  */
-#line 3551 "mrbgems/mruby-compiler/core/parse.y"
+#line 3566 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       local_nest(p);
                       nvars_nest(p);
                       (yyval.num) = p->lpar_beg;
                       p->lpar_beg = ++p->paren_nest;
                     }
-#line 9497 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9512 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 314: /* @13: %empty  */
-#line 3558 "mrbgems/mruby-compiler/core/parse.y"
+#line 3573 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.stack) = p->cmdarg_stack;
                       p->cmdarg_stack = 0;
                     }
-#line 9506 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9521 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 315: /* primary: "->" @12 f_larglist @13 lambda_body  */
-#line 3563 "mrbgems/mruby-compiler/core/parse.y"
+#line 3578 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       p->lpar_beg = (yyvsp[-3].num);
                       (yyval.nd) = new_lambda(p, (yyvsp[-2].nd), (yyvsp[0].nd));
@@ -9515,149 +9530,149 @@ yyreduce:
                       p->cmdarg_stack = (yyvsp[-1].stack);
                       CMDARG_LEXPOP();
                     }
-#line 9519 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9534 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 316: /* primary: "'if'" expr_value then compstmt if_tail "'end'"  */
-#line 3575 "mrbgems/mruby-compiler/core/parse.y"
+#line 3590 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_if(p, cond((yyvsp[-4].nd)), (yyvsp[-2].nd), (yyvsp[-1].nd));
                       SET_LINENO((yyval.nd), (yyvsp[-5].num));
                     }
-#line 9528 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9543 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 317: /* primary: "'unless'" expr_value then compstmt opt_else "'end'"  */
-#line 3583 "mrbgems/mruby-compiler/core/parse.y"
+#line 3598 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_if(p, cond((yyvsp[-4].nd)), (yyvsp[-1].nd), (yyvsp[-2].nd));
                       SET_LINENO((yyval.nd), (yyvsp[-5].num));
                     }
-#line 9537 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9552 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 318: /* $@14: %empty  */
-#line 3587 "mrbgems/mruby-compiler/core/parse.y"
+#line 3602 "mrbgems/mruby-compiler/core/parse.y"
                                 {COND_PUSH(1);}
-#line 9543 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9558 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 319: /* $@15: %empty  */
-#line 3587 "mrbgems/mruby-compiler/core/parse.y"
+#line 3602 "mrbgems/mruby-compiler/core/parse.y"
                                                               {COND_POP();}
-#line 9549 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9564 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 320: /* primary: "'while'" $@14 expr_value do $@15 compstmt "'end'"  */
-#line 3590 "mrbgems/mruby-compiler/core/parse.y"
+#line 3605 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_while(p, cond((yyvsp[-4].nd)), (yyvsp[-1].nd));
                       SET_LINENO((yyval.nd), (yyvsp[-6].num));
                     }
-#line 9558 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9573 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 321: /* $@16: %empty  */
-#line 3594 "mrbgems/mruby-compiler/core/parse.y"
+#line 3609 "mrbgems/mruby-compiler/core/parse.y"
                                 {COND_PUSH(1);}
-#line 9564 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9579 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 322: /* $@17: %empty  */
-#line 3594 "mrbgems/mruby-compiler/core/parse.y"
+#line 3609 "mrbgems/mruby-compiler/core/parse.y"
                                                               {COND_POP();}
-#line 9570 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9585 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 323: /* primary: "'until'" $@16 expr_value do $@17 compstmt "'end'"  */
-#line 3597 "mrbgems/mruby-compiler/core/parse.y"
+#line 3612 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_until(p, cond((yyvsp[-4].nd)), (yyvsp[-1].nd));
                       SET_LINENO((yyval.nd), (yyvsp[-6].num));
                     }
-#line 9579 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9594 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 324: /* primary: "'case'" expr_value opt_terms case_body "'end'"  */
-#line 3604 "mrbgems/mruby-compiler/core/parse.y"
+#line 3619 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_case(p, (yyvsp[-3].nd), (yyvsp[-1].nd));
                     }
-#line 9587 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9602 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 325: /* primary: "'case'" opt_terms case_body "'end'"  */
-#line 3608 "mrbgems/mruby-compiler/core/parse.y"
+#line 3623 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_case(p, 0, (yyvsp[-1].nd));
                     }
-#line 9595 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9610 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 326: /* $@18: %empty  */
-#line 3612 "mrbgems/mruby-compiler/core/parse.y"
+#line 3627 "mrbgems/mruby-compiler/core/parse.y"
                   {COND_PUSH(1);}
-#line 9601 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9616 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 327: /* $@19: %empty  */
-#line 3614 "mrbgems/mruby-compiler/core/parse.y"
+#line 3629 "mrbgems/mruby-compiler/core/parse.y"
                   {COND_POP();}
-#line 9607 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9622 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 328: /* primary: "'for'" for_var "'in'" $@18 expr_value do $@19 compstmt "'end'"  */
-#line 3617 "mrbgems/mruby-compiler/core/parse.y"
+#line 3632 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_for(p, (yyvsp[-7].nd), (yyvsp[-4].nd), (yyvsp[-1].nd));
                       SET_LINENO((yyval.nd), (yyvsp[-8].num));
                     }
-#line 9616 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9631 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 329: /* @20: %empty  */
-#line 3623 "mrbgems/mruby-compiler/core/parse.y"
+#line 3638 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       if (p->in_def || p->in_single)
                         yyerror(&(yylsp[-2]), p, "class definition in method body");
                       (yyval.nd) = local_switch(p);
                       nvars_block(p);
                     }
-#line 9627 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9642 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 330: /* primary: "'class'" cpath superclass @20 bodystmt "'end'"  */
-#line 3631 "mrbgems/mruby-compiler/core/parse.y"
+#line 3646 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_class(p, (yyvsp[-4].nd), (yyvsp[-3].nd), (yyvsp[-1].nd));
                       SET_LINENO((yyval.nd), (yyvsp[-5].num));
                       local_resume(p, (yyvsp[-2].nd));
                       nvars_unnest(p);
                     }
-#line 9638 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9653 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 331: /* @21: %empty  */
-#line 3639 "mrbgems/mruby-compiler/core/parse.y"
+#line 3654 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.num) = p->in_def;
                       p->in_def = 0;
                     }
-#line 9647 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9662 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 332: /* @22: %empty  */
-#line 3644 "mrbgems/mruby-compiler/core/parse.y"
+#line 3659 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = cons(local_switch(p), int_to_node(p->in_single));
                       nvars_block(p);
                       p->in_single = 0;
                     }
-#line 9657 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9672 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 333: /* primary: "'class'" "<<" expr @21 term @22 bodystmt "'end'"  */
-#line 3651 "mrbgems/mruby-compiler/core/parse.y"
+#line 3666 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_sclass(p, (yyvsp[-5].nd), (yyvsp[-1].nd));
                       SET_LINENO((yyval.nd), (yyvsp[-7].num));
@@ -9666,44 +9681,44 @@ yyreduce:
                       p->in_def = (yyvsp[-4].num);
                       p->in_single = node_to_int((yyvsp[-2].nd)->cdr);
                     }
-#line 9670 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9685 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 334: /* @23: %empty  */
-#line 3661 "mrbgems/mruby-compiler/core/parse.y"
+#line 3676 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       if (p->in_def || p->in_single)
                         yyerror(&(yylsp[-1]), p, "module definition in method body");
                       (yyval.nd) = local_switch(p);
                       nvars_block(p);
                     }
-#line 9681 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9696 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 335: /* primary: "'module'" cpath @23 bodystmt "'end'"  */
-#line 3669 "mrbgems/mruby-compiler/core/parse.y"
+#line 3684 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_module(p, (yyvsp[-3].nd), (yyvsp[-1].nd));
                       SET_LINENO((yyval.nd), (yyvsp[-4].num));
                       local_resume(p, (yyvsp[-2].nd));
                       nvars_unnest(p);
                     }
-#line 9692 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9707 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 336: /* primary: defn_head f_arglist bodystmt "'end'"  */
-#line 3679 "mrbgems/mruby-compiler/core/parse.y"
+#line 3694 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-3].nd);
                       defn_setup(p, (yyval.nd), (yyvsp[-2].nd), (yyvsp[-1].nd));
                       nvars_unnest(p);
                       p->in_def--;
                     }
-#line 9703 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9718 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 337: /* primary: defs_head f_arglist bodystmt "'end'"  */
-#line 3689 "mrbgems/mruby-compiler/core/parse.y"
+#line 3704 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-3].nd);
                       defn_setup(p, (yyval.nd), (yyvsp[-2].nd), (yyvsp[-1].nd));
@@ -9711,610 +9726,610 @@ yyreduce:
                       p->in_def--;
                       p->in_single--;
                     }
-#line 9715 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9730 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 338: /* primary: "'break'"  */
-#line 3697 "mrbgems/mruby-compiler/core/parse.y"
+#line 3712 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_break(p, 0);
                     }
-#line 9723 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9738 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 339: /* primary: "'next'"  */
-#line 3701 "mrbgems/mruby-compiler/core/parse.y"
+#line 3716 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_next(p, 0);
                     }
-#line 9731 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9746 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 340: /* primary: "'redo'"  */
-#line 3705 "mrbgems/mruby-compiler/core/parse.y"
+#line 3720 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_redo(p);
                     }
-#line 9739 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9754 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 341: /* primary: "'retry'"  */
-#line 3709 "mrbgems/mruby-compiler/core/parse.y"
+#line 3724 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_retry(p);
                     }
-#line 9747 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9762 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 342: /* primary_value: primary  */
-#line 3715 "mrbgems/mruby-compiler/core/parse.y"
+#line 3730 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[0].nd);
                       if (!(yyval.nd)) (yyval.nd) = new_nil(p);
                     }
-#line 9756 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9771 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 349: /* if_tail: "'elsif'" expr_value then compstmt if_tail  */
-#line 3734 "mrbgems/mruby-compiler/core/parse.y"
+#line 3749 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_if(p, cond((yyvsp[-3].nd)), (yyvsp[-1].nd), (yyvsp[0].nd));
                     }
-#line 9764 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9779 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 351: /* opt_else: "'else'" compstmt  */
-#line 3741 "mrbgems/mruby-compiler/core/parse.y"
+#line 3756 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[0].nd);
                     }
-#line 9772 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9787 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 352: /* for_var: lhs  */
-#line 3747 "mrbgems/mruby-compiler/core/parse.y"
+#line 3762 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1(list1((yyvsp[0].nd)));
                     }
-#line 9780 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9795 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 354: /* f_margs: f_arg  */
-#line 3754 "mrbgems/mruby-compiler/core/parse.y"
+#line 3769 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list3((yyvsp[0].nd),0,0);
                     }
-#line 9788 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9803 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 355: /* f_margs: f_arg ',' "*" f_norm_arg  */
-#line 3758 "mrbgems/mruby-compiler/core/parse.y"
+#line 3773 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list3((yyvsp[-3].nd), new_arg(p, (yyvsp[0].id)), 0);
                     }
-#line 9796 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9811 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 356: /* f_margs: f_arg ',' "*" f_norm_arg ',' f_arg  */
-#line 3762 "mrbgems/mruby-compiler/core/parse.y"
+#line 3777 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list3((yyvsp[-5].nd), new_arg(p, (yyvsp[-2].id)), (yyvsp[0].nd));
                     }
-#line 9804 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9819 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 357: /* f_margs: f_arg ',' "*"  */
-#line 3766 "mrbgems/mruby-compiler/core/parse.y"
+#line 3781 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       local_add_f(p, intern_op(mul));
                       (yyval.nd) = list3((yyvsp[-2].nd), int_to_node(-1), 0);
                     }
-#line 9813 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9828 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 358: /* f_margs: f_arg ',' "*" ',' f_arg  */
-#line 3771 "mrbgems/mruby-compiler/core/parse.y"
+#line 3786 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list3((yyvsp[-4].nd), int_to_node(-1), (yyvsp[0].nd));
                     }
-#line 9821 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9836 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 359: /* f_margs: "*" f_norm_arg  */
-#line 3775 "mrbgems/mruby-compiler/core/parse.y"
+#line 3790 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list3(0, new_arg(p, (yyvsp[0].id)), 0);
                     }
-#line 9829 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9844 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 360: /* f_margs: "*" f_norm_arg ',' f_arg  */
-#line 3779 "mrbgems/mruby-compiler/core/parse.y"
+#line 3794 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list3(0, new_arg(p, (yyvsp[-2].id)), (yyvsp[0].nd));
                     }
-#line 9837 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9852 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 361: /* f_margs: "*"  */
-#line 3783 "mrbgems/mruby-compiler/core/parse.y"
+#line 3798 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       local_add_f(p, intern_op(mul));
                       (yyval.nd) = list3(0, int_to_node(-1), 0);
                     }
-#line 9846 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9861 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 362: /* $@24: %empty  */
-#line 3788 "mrbgems/mruby-compiler/core/parse.y"
+#line 3803 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       local_add_f(p, intern_op(mul));
                     }
-#line 9854 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9869 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 363: /* f_margs: "*" ',' $@24 f_arg  */
-#line 3792 "mrbgems/mruby-compiler/core/parse.y"
+#line 3807 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list3(0, int_to_node(-1), (yyvsp[0].nd));
                     }
-#line 9862 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9877 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 364: /* block_args_tail: f_block_kwarg ',' f_kwrest opt_f_block_arg  */
-#line 3798 "mrbgems/mruby-compiler/core/parse.y"
+#line 3813 "mrbgems/mruby-compiler/core/parse.y"
                     {
-                      (yyval.nd) = new_args_tail(p, (yyvsp[-3].nd), (yyvsp[-1].nd), (yyvsp[0].id));
+                      (yyval.nd) = new_args_tail(p, (yyvsp[-3].nd), (yyvsp[-1].id), (yyvsp[0].id));
                     }
-#line 9870 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9885 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 365: /* block_args_tail: f_block_kwarg opt_f_block_arg  */
-#line 3802 "mrbgems/mruby-compiler/core/parse.y"
+#line 3817 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args_tail(p, (yyvsp[-1].nd), 0, (yyvsp[0].id));
                     }
-#line 9878 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9893 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 366: /* block_args_tail: f_kwrest opt_f_block_arg  */
-#line 3806 "mrbgems/mruby-compiler/core/parse.y"
+#line 3821 "mrbgems/mruby-compiler/core/parse.y"
                     {
-                      (yyval.nd) = new_args_tail(p, 0, (yyvsp[-1].nd), (yyvsp[0].id));
+                      (yyval.nd) = new_args_tail(p, 0, (yyvsp[-1].id), (yyvsp[0].id));
                     }
-#line 9886 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9901 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 367: /* block_args_tail: f_block_arg  */
-#line 3810 "mrbgems/mruby-compiler/core/parse.y"
+#line 3825 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args_tail(p, 0, 0, (yyvsp[0].id));
                     }
-#line 9894 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9909 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 368: /* opt_block_args_tail: ',' block_args_tail  */
-#line 3816 "mrbgems/mruby-compiler/core/parse.y"
+#line 3831 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[0].nd);
                     }
-#line 9902 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9917 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 369: /* opt_block_args_tail: %empty  */
-#line 3820 "mrbgems/mruby-compiler/core/parse.y"
+#line 3835 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args_tail(p, 0, 0, 0);
                     }
-#line 9910 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9925 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 370: /* block_param: f_arg ',' f_block_optarg ',' f_rest_arg opt_block_args_tail  */
-#line 3826 "mrbgems/mruby-compiler/core/parse.y"
+#line 3841 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, (yyvsp[-5].nd), (yyvsp[-3].nd), (yyvsp[-1].id), 0, (yyvsp[0].nd));
                     }
-#line 9918 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9933 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 371: /* block_param: f_arg ',' f_block_optarg ',' f_rest_arg ',' f_arg opt_block_args_tail  */
-#line 3830 "mrbgems/mruby-compiler/core/parse.y"
+#line 3845 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, (yyvsp[-7].nd), (yyvsp[-5].nd), (yyvsp[-3].id), (yyvsp[-1].nd), (yyvsp[0].nd));
                     }
-#line 9926 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9941 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 372: /* block_param: f_arg ',' f_block_optarg opt_block_args_tail  */
-#line 3834 "mrbgems/mruby-compiler/core/parse.y"
+#line 3849 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, (yyvsp[-3].nd), (yyvsp[-1].nd), 0, 0, (yyvsp[0].nd));
                     }
-#line 9934 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9949 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 373: /* block_param: f_arg ',' f_block_optarg ',' f_arg opt_block_args_tail  */
-#line 3838 "mrbgems/mruby-compiler/core/parse.y"
+#line 3853 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, (yyvsp[-5].nd), (yyvsp[-3].nd), 0, (yyvsp[-1].nd), (yyvsp[0].nd));
                     }
-#line 9942 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9957 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 374: /* block_param: f_arg ',' f_rest_arg opt_block_args_tail  */
-#line 3842 "mrbgems/mruby-compiler/core/parse.y"
+#line 3857 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, (yyvsp[-3].nd), 0, (yyvsp[-1].id), 0, (yyvsp[0].nd));
                     }
-#line 9950 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9965 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 375: /* block_param: f_arg ',' opt_block_args_tail  */
-#line 3846 "mrbgems/mruby-compiler/core/parse.y"
+#line 3861 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, (yyvsp[-2].nd), 0, 0, 0, (yyvsp[0].nd));
                     }
-#line 9958 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9973 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 376: /* block_param: f_arg ',' f_rest_arg ',' f_arg opt_block_args_tail  */
-#line 3850 "mrbgems/mruby-compiler/core/parse.y"
+#line 3865 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, (yyvsp[-5].nd), 0, (yyvsp[-3].id), (yyvsp[-1].nd), (yyvsp[0].nd));
                     }
-#line 9966 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9981 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 377: /* block_param: f_arg opt_block_args_tail  */
-#line 3854 "mrbgems/mruby-compiler/core/parse.y"
+#line 3869 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, (yyvsp[-1].nd), 0, 0, 0, (yyvsp[0].nd));
                     }
-#line 9974 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9989 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 378: /* block_param: f_block_optarg ',' f_rest_arg opt_block_args_tail  */
-#line 3858 "mrbgems/mruby-compiler/core/parse.y"
+#line 3873 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, 0, (yyvsp[-3].nd), (yyvsp[-1].id), 0, (yyvsp[0].nd));
                     }
-#line 9982 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9997 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 379: /* block_param: f_block_optarg ',' f_rest_arg ',' f_arg opt_block_args_tail  */
-#line 3862 "mrbgems/mruby-compiler/core/parse.y"
+#line 3877 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, 0, (yyvsp[-5].nd), (yyvsp[-3].id), (yyvsp[-1].nd), (yyvsp[0].nd));
                     }
-#line 9990 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10005 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 380: /* block_param: f_block_optarg opt_block_args_tail  */
-#line 3866 "mrbgems/mruby-compiler/core/parse.y"
+#line 3881 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, 0, (yyvsp[-1].nd), 0, 0, (yyvsp[0].nd));
                     }
-#line 9998 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10013 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 381: /* block_param: f_block_optarg ',' f_arg opt_block_args_tail  */
-#line 3870 "mrbgems/mruby-compiler/core/parse.y"
+#line 3885 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, 0, (yyvsp[-3].nd), 0, (yyvsp[-1].nd), (yyvsp[0].nd));
                     }
-#line 10006 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10021 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 382: /* block_param: f_rest_arg opt_block_args_tail  */
-#line 3874 "mrbgems/mruby-compiler/core/parse.y"
+#line 3889 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, 0, 0, (yyvsp[-1].id), 0, (yyvsp[0].nd));
                     }
-#line 10014 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10029 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 383: /* block_param: f_rest_arg ',' f_arg opt_block_args_tail  */
-#line 3878 "mrbgems/mruby-compiler/core/parse.y"
+#line 3893 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, 0, 0, (yyvsp[-3].id), (yyvsp[-1].nd), (yyvsp[0].nd));
                     }
-#line 10022 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10037 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 384: /* block_param: block_args_tail  */
-#line 3882 "mrbgems/mruby-compiler/core/parse.y"
+#line 3897 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, 0, 0, 0, 0, (yyvsp[0].nd));
                     }
-#line 10030 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10045 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 385: /* opt_block_param: none  */
-#line 3888 "mrbgems/mruby-compiler/core/parse.y"
+#line 3903 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       local_add_blk(p);
                       (yyval.nd) = 0;
                     }
-#line 10039 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10054 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 386: /* opt_block_param: block_param_def  */
-#line 3893 "mrbgems/mruby-compiler/core/parse.y"
+#line 3908 "mrbgems/mruby-compiler/core/parse.y"
                    {
                       p->cmd_start = TRUE;
                       (yyval.nd) = (yyvsp[0].nd);
                     }
-#line 10048 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10063 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 387: /* $@25: %empty  */
-#line 3899 "mrbgems/mruby-compiler/core/parse.y"
+#line 3914 "mrbgems/mruby-compiler/core/parse.y"
                       {local_add_blk(p);}
-#line 10054 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10069 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 388: /* block_param_def: '|' $@25 opt_bv_decl '|'  */
-#line 3900 "mrbgems/mruby-compiler/core/parse.y"
-                    {
-                      (yyval.nd) = 0;
-                    }
-#line 10062 "mrbgems/mruby-compiler/core/y.tab.c"
-    break;
-
-  case 389: /* block_param_def: "||"  */
-#line 3904 "mrbgems/mruby-compiler/core/parse.y"
-                    {
-                      local_add_blk(p);
-                      (yyval.nd) = 0;
-                    }
-#line 10071 "mrbgems/mruby-compiler/core/y.tab.c"
-    break;
-
-  case 390: /* block_param_def: '|' block_param opt_bv_decl '|'  */
-#line 3909 "mrbgems/mruby-compiler/core/parse.y"
-                    {
-                      (yyval.nd) = (yyvsp[-2].nd);
-                    }
-#line 10079 "mrbgems/mruby-compiler/core/y.tab.c"
-    break;
-
-  case 391: /* opt_bv_decl: opt_nl  */
 #line 3915 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = 0;
                     }
-#line 10087 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10077 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
-  case 392: /* opt_bv_decl: opt_nl ';' bv_decls opt_nl  */
+  case 389: /* block_param_def: "||"  */
 #line 3919 "mrbgems/mruby-compiler/core/parse.y"
+                    {
+                      local_add_blk(p);
+                      (yyval.nd) = 0;
+                    }
+#line 10086 "mrbgems/mruby-compiler/core/y.tab.c"
+    break;
+
+  case 390: /* block_param_def: '|' block_param opt_bv_decl '|'  */
+#line 3924 "mrbgems/mruby-compiler/core/parse.y"
+                    {
+                      (yyval.nd) = (yyvsp[-2].nd);
+                    }
+#line 10094 "mrbgems/mruby-compiler/core/y.tab.c"
+    break;
+
+  case 391: /* opt_bv_decl: opt_nl  */
+#line 3930 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = 0;
                     }
-#line 10095 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10102 "mrbgems/mruby-compiler/core/y.tab.c"
+    break;
+
+  case 392: /* opt_bv_decl: opt_nl ';' bv_decls opt_nl  */
+#line 3934 "mrbgems/mruby-compiler/core/parse.y"
+                    {
+                      (yyval.nd) = 0;
+                    }
+#line 10110 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 395: /* bvar: "local variable or method"  */
-#line 3929 "mrbgems/mruby-compiler/core/parse.y"
+#line 3944 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       local_add_f(p, (yyvsp[0].id));
                       new_bv(p, (yyvsp[0].id));
                     }
-#line 10104 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10119 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 397: /* f_larglist: '(' f_args opt_bv_decl ')'  */
-#line 3937 "mrbgems/mruby-compiler/core/parse.y"
+#line 3952 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-2].nd);
                     }
-#line 10112 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10127 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 398: /* f_larglist: f_args  */
-#line 3941 "mrbgems/mruby-compiler/core/parse.y"
+#line 3956 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[0].nd);
                     }
-#line 10120 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10135 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 399: /* lambda_body: tLAMBEG compstmt '}'  */
-#line 3947 "mrbgems/mruby-compiler/core/parse.y"
+#line 3962 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-1].nd);
                     }
-#line 10128 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10143 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 400: /* lambda_body: "'do' for lambda" bodystmt "'end'"  */
-#line 3951 "mrbgems/mruby-compiler/core/parse.y"
+#line 3966 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-1].nd);
                     }
-#line 10136 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10151 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 401: /* @26: %empty  */
-#line 3957 "mrbgems/mruby-compiler/core/parse.y"
+#line 3972 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       local_nest(p);
                       nvars_nest(p);
                       (yyval.num) = p->lineno;
                     }
-#line 10146 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10161 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 402: /* do_block: "'do' for block" @26 opt_block_param bodystmt "'end'"  */
-#line 3965 "mrbgems/mruby-compiler/core/parse.y"
+#line 3980 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_block(p,(yyvsp[-2].nd),(yyvsp[-1].nd));
                       SET_LINENO((yyval.nd), (yyvsp[-3].num));
                       local_unnest(p);
                       nvars_unnest(p);
                     }
-#line 10157 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10172 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 403: /* block_call: command do_block  */
-#line 3974 "mrbgems/mruby-compiler/core/parse.y"
+#line 3989 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       call_with_block(p, (yyvsp[-1].nd), (yyvsp[0].nd));
                       (yyval.nd) = (yyvsp[-1].nd);
                     }
-#line 10166 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10181 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 404: /* block_call: block_call call_op2 operation2 opt_paren_args  */
-#line 3979 "mrbgems/mruby-compiler/core/parse.y"
+#line 3994 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-3].nd), (yyvsp[-1].id), (yyvsp[0].nd), (yyvsp[-2].num));
                     }
-#line 10174 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10189 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 405: /* block_call: block_call call_op2 operation2 opt_paren_args brace_block  */
-#line 3983 "mrbgems/mruby-compiler/core/parse.y"
+#line 3998 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-4].nd), (yyvsp[-2].id), (yyvsp[-1].nd), (yyvsp[-3].num));
                       call_with_block(p, (yyval.nd), (yyvsp[0].nd));
                     }
-#line 10183 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10198 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 406: /* block_call: block_call call_op2 operation2 command_args do_block  */
-#line 3988 "mrbgems/mruby-compiler/core/parse.y"
+#line 4003 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-4].nd), (yyvsp[-2].id), (yyvsp[-1].nd), (yyvsp[-3].num));
                       call_with_block(p, (yyval.nd), (yyvsp[0].nd));
                     }
-#line 10192 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10207 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 407: /* method_call: operation paren_args  */
-#line 3995 "mrbgems/mruby-compiler/core/parse.y"
+#line 4010 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_fcall(p, (yyvsp[-1].id), (yyvsp[0].nd));
                     }
-#line 10200 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10215 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 408: /* method_call: primary_value call_op operation2 opt_paren_args  */
-#line 3999 "mrbgems/mruby-compiler/core/parse.y"
+#line 4014 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-3].nd), (yyvsp[-1].id), (yyvsp[0].nd), (yyvsp[-2].num));
                     }
-#line 10208 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10223 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 409: /* method_call: primary_value "::" operation2 paren_args  */
-#line 4003 "mrbgems/mruby-compiler/core/parse.y"
+#line 4018 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-3].nd), (yyvsp[-1].id), (yyvsp[0].nd), tCOLON2);
                     }
-#line 10216 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10231 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 410: /* method_call: primary_value "::" operation3  */
-#line 4007 "mrbgems/mruby-compiler/core/parse.y"
+#line 4022 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-2].nd), (yyvsp[0].id), 0, tCOLON2);
                     }
-#line 10224 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10239 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 411: /* method_call: primary_value call_op paren_args  */
-#line 4011 "mrbgems/mruby-compiler/core/parse.y"
+#line 4026 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-2].nd), MRB_SYM_2(p->mrb, call), (yyvsp[0].nd), (yyvsp[-1].num));
                     }
-#line 10232 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10247 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 412: /* method_call: primary_value "::" paren_args  */
-#line 4015 "mrbgems/mruby-compiler/core/parse.y"
+#line 4030 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-2].nd), MRB_SYM_2(p->mrb, call), (yyvsp[0].nd), tCOLON2);
                     }
-#line 10240 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10255 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 413: /* method_call: "'super'" paren_args  */
-#line 4019 "mrbgems/mruby-compiler/core/parse.y"
+#line 4034 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_super(p, (yyvsp[0].nd));
                     }
-#line 10248 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10263 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 414: /* method_call: "'super'"  */
-#line 4023 "mrbgems/mruby-compiler/core/parse.y"
+#line 4038 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_zsuper(p);
                     }
-#line 10256 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10271 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 415: /* method_call: primary_value '[' opt_call_args ']'  */
-#line 4027 "mrbgems/mruby-compiler/core/parse.y"
+#line 4042 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-3].nd), intern_op(aref), (yyvsp[-1].nd), '.');
                     }
-#line 10264 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10279 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 416: /* @27: %empty  */
-#line 4033 "mrbgems/mruby-compiler/core/parse.y"
+#line 4048 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       local_nest(p);
                       nvars_nest(p);
                       (yyval.num) = p->lineno;
                     }
-#line 10274 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10289 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 417: /* brace_block: '{' @27 opt_block_param compstmt '}'  */
-#line 4040 "mrbgems/mruby-compiler/core/parse.y"
+#line 4055 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_block(p,(yyvsp[-2].nd),(yyvsp[-1].nd));
                       SET_LINENO((yyval.nd), (yyvsp[-3].num));
                       local_unnest(p);
                       nvars_unnest(p);
                     }
-#line 10285 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10300 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 418: /* @28: %empty  */
-#line 4047 "mrbgems/mruby-compiler/core/parse.y"
+#line 4062 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       local_nest(p);
                       nvars_nest(p);
                       (yyval.num) = p->lineno;
                     }
-#line 10295 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10310 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 419: /* brace_block: "'do'" @28 opt_block_param bodystmt "'end'"  */
-#line 4054 "mrbgems/mruby-compiler/core/parse.y"
+#line 4069 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_block(p,(yyvsp[-2].nd),(yyvsp[-1].nd));
                       SET_LINENO((yyval.nd), (yyvsp[-3].num));
                       local_unnest(p);
                       nvars_unnest(p);
                     }
-#line 10306 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10321 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 420: /* case_body: "'when'" args then compstmt cases  */
-#line 4065 "mrbgems/mruby-compiler/core/parse.y"
+#line 4080 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = cons(cons((yyvsp[-3].nd), (yyvsp[-1].nd)), (yyvsp[0].nd));
                     }
-#line 10314 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10329 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 421: /* cases: opt_else  */
-#line 4071 "mrbgems/mruby-compiler/core/parse.y"
+#line 4086 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       if ((yyvsp[0].nd)) {
                         (yyval.nd) = cons(cons(0, (yyvsp[0].nd)), 0);
@@ -10323,155 +10338,155 @@ yyreduce:
                         (yyval.nd) = 0;
                       }
                     }
-#line 10327 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10342 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 423: /* opt_rescue: "'rescue'" exc_list exc_var then compstmt opt_rescue  */
-#line 4085 "mrbgems/mruby-compiler/core/parse.y"
+#line 4100 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1(list3((yyvsp[-4].nd), (yyvsp[-3].nd), (yyvsp[-1].nd)));
                       if ((yyvsp[0].nd)) (yyval.nd) = append((yyval.nd), (yyvsp[0].nd));
                     }
-#line 10336 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10351 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 425: /* exc_list: arg  */
-#line 4093 "mrbgems/mruby-compiler/core/parse.y"
+#line 4108 "mrbgems/mruby-compiler/core/parse.y"
                     {
                         (yyval.nd) = list1((yyvsp[0].nd));
                     }
-#line 10344 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10359 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 428: /* exc_var: "=>" lhs  */
-#line 4101 "mrbgems/mruby-compiler/core/parse.y"
+#line 4116 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[0].nd);
                     }
-#line 10352 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10367 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 430: /* opt_ensure: "'ensure'" compstmt  */
-#line 4108 "mrbgems/mruby-compiler/core/parse.y"
+#line 4123 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[0].nd);
                     }
-#line 10360 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10375 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 437: /* string: string string_fragment  */
-#line 4122 "mrbgems/mruby-compiler/core/parse.y"
+#line 4137 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = append((yyvsp[-1].nd), (yyvsp[0].nd));
                     }
-#line 10368 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10383 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 438: /* string_fragment: "character literal"  */
-#line 4128 "mrbgems/mruby-compiler/core/parse.y"
+#line 4143 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       /* tCHAR is (len . str), wrap as cons list */
                       (yyval.nd) = list1((yyvsp[0].nd));
                     }
-#line 10377 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10392 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 439: /* string_fragment: tSTRING  */
-#line 4133 "mrbgems/mruby-compiler/core/parse.y"
+#line 4148 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       /* tSTRING is (len . str), wrap as cons list */
                       (yyval.nd) = list1((yyvsp[0].nd));
                     }
-#line 10386 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10401 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 440: /* string_fragment: "string literal" tSTRING  */
-#line 4138 "mrbgems/mruby-compiler/core/parse.y"
+#line 4153 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       /* $2 is (len . str), wrap as cons list */
                       (yyval.nd) = list1((yyvsp[0].nd));
                     }
-#line 10395 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10410 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 441: /* string_fragment: "string literal" string_rep tSTRING  */
-#line 4143 "mrbgems/mruby-compiler/core/parse.y"
+#line 4158 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push((yyvsp[-1].nd), (yyvsp[0].nd));
                     }
-#line 10403 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10418 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 443: /* string_rep: string_rep string_interp  */
-#line 4150 "mrbgems/mruby-compiler/core/parse.y"
+#line 4165 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = append((yyvsp[-1].nd), (yyvsp[0].nd));
                     }
-#line 10411 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10426 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 444: /* string_interp: tSTRING_MID  */
-#line 4156 "mrbgems/mruby-compiler/core/parse.y"
+#line 4171 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       /* $1 is already in (len . str) format */
                       (yyval.nd) = list1((yyvsp[0].nd));
                     }
-#line 10420 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10435 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 445: /* @29: %empty  */
-#line 4161 "mrbgems/mruby-compiler/core/parse.y"
+#line 4176 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push_strterm(p);
                     }
-#line 10428 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10443 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 446: /* string_interp: tSTRING_PART @29 compstmt '}'  */
-#line 4166 "mrbgems/mruby-compiler/core/parse.y"
+#line 4181 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       pop_strterm(p,(yyvsp[-2].nd));
                       /* $1 is already in (len . str) format, create (-1 . node) for expression */
                       node *expr_elem = cons(int_to_node(-1), (yyvsp[-1].nd));
                       (yyval.nd) = list2((yyvsp[-3].nd), expr_elem);
                     }
-#line 10439 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10454 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 447: /* string_interp: tLITERAL_DELIM  */
-#line 4173 "mrbgems/mruby-compiler/core/parse.y"
+#line 4188 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1(new_literal_delim(p));
                     }
-#line 10447 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10462 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 448: /* string_interp: tHD_LITERAL_DELIM heredoc_bodies  */
-#line 4177 "mrbgems/mruby-compiler/core/parse.y"
+#line 4192 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1(new_literal_delim(p));
                     }
-#line 10455 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10470 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 449: /* xstring: tXSTRING_BEG tXSTRING  */
-#line 4183 "mrbgems/mruby-compiler/core/parse.y"
+#line 4198 "mrbgems/mruby-compiler/core/parse.y"
                     {
                         (yyval.nd) = cons((yyvsp[0].nd), (node*)NULL);
                     }
-#line 10463 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10478 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 450: /* xstring: tXSTRING_BEG string_rep tXSTRING  */
-#line 4187 "mrbgems/mruby-compiler/core/parse.y"
+#line 4202 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push((yyvsp[-1].nd), (yyvsp[0].nd));
                     }
-#line 10471 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10486 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 451: /* regexp: tREGEXP_BEG tREGEXP  */
-#line 4193 "mrbgems/mruby-compiler/core/parse.y"
+#line 4208 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       node *data = (yyvsp[0].nd);  /* ((len . pattern) . (flags . encoding)) */
                       const char *flags = (const char*)data->cdr->car;
@@ -10480,11 +10495,11 @@ yyreduce:
                       node *pattern_list = cons(data->car, (node*)NULL);
                       (yyval.nd) = new_dregx(p, pattern_list, flags, encoding);
                     }
-#line 10484 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10499 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 452: /* regexp: tREGEXP_BEG string_rep tREGEXP  */
-#line 4202 "mrbgems/mruby-compiler/core/parse.y"
+#line 4217 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       node *data = (yyvsp[0].nd);  /* ((len . pattern) . (flags . encoding)) */
                       const char *flags = (const char*)data->cdr->car;
@@ -10493,47 +10508,47 @@ yyreduce:
                       node *complete_list = push((yyvsp[-1].nd), data->car);
                       (yyval.nd) = new_dregx(p, complete_list, flags, encoding);
                     }
-#line 10497 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10512 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 456: /* heredoc_body: tHEREDOC_END  */
-#line 4220 "mrbgems/mruby-compiler/core/parse.y"
+#line 4235 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       parser_heredoc_info *info = parsing_heredoc_info(p);
                       info->doc = push(info->doc, new_str_empty(p));
                       heredoc_end(p);
                     }
-#line 10507 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10522 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 457: /* heredoc_body: heredoc_string_rep tHEREDOC_END  */
-#line 4226 "mrbgems/mruby-compiler/core/parse.y"
+#line 4241 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       heredoc_end(p);
                     }
-#line 10515 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10530 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 460: /* heredoc_string_interp: tHD_STRING_MID  */
-#line 4236 "mrbgems/mruby-compiler/core/parse.y"
+#line 4251 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       parser_heredoc_info *info = parsing_heredoc_info(p);
                       info->doc = push(info->doc, (yyvsp[0].nd));
                       heredoc_treat_nextline(p);
                     }
-#line 10525 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10540 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 461: /* @30: %empty  */
-#line 4242 "mrbgems/mruby-compiler/core/parse.y"
+#line 4257 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push_strterm(p);
                     }
-#line 10533 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10548 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 462: /* heredoc_string_interp: tHD_STRING_PART @30 compstmt '}'  */
-#line 4247 "mrbgems/mruby-compiler/core/parse.y"
+#line 4262 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       pop_strterm(p, (yyvsp[-2].nd));
                       parser_heredoc_info *info = parsing_heredoc_info(p);
@@ -10541,37 +10556,37 @@ yyreduce:
                       node *expr_elem = cons(int_to_node(-1), (yyvsp[-1].nd));
                       info->doc = push(push(info->doc, (yyvsp[-3].nd)), expr_elem);
                     }
-#line 10545 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10560 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 463: /* words: tWORDS_BEG tSTRING  */
-#line 4257 "mrbgems/mruby-compiler/core/parse.y"
+#line 4272 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_words(p, list1((yyvsp[0].nd)));
                     }
-#line 10553 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10568 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 464: /* words: tWORDS_BEG string_rep tSTRING  */
-#line 4261 "mrbgems/mruby-compiler/core/parse.y"
+#line 4276 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       node *n = (yyvsp[-1].nd);
                       n = push(n, (yyvsp[0].nd));
                       (yyval.nd) = new_words(p, n);
                     }
-#line 10563 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10578 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 465: /* symbol: basic_symbol  */
-#line 4269 "mrbgems/mruby-compiler/core/parse.y"
+#line 4284 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_sym(p, (yyvsp[0].id));
                     }
-#line 10571 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10586 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 466: /* symbol: "symbol" "string literal" string_rep tSTRING  */
-#line 4273 "mrbgems/mruby-compiler/core/parse.y"
+#line 4288 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       node *n = (yyvsp[-1].nd);
                       p->lstate = EXPR_ENDARG;
@@ -10583,183 +10598,183 @@ yyreduce:
                       }
                       (yyval.nd) = new_dsym(p, new_str(p, n));
                     }
-#line 10587 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10602 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 467: /* symbol: "symbol" "numbered parameter"  */
-#line 4285 "mrbgems/mruby-compiler/core/parse.y"
+#line 4300 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       mrb_sym sym = intern_numparam((yyvsp[0].num));
                       (yyval.nd) = new_sym(p, sym);
                     }
-#line 10596 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10611 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 468: /* basic_symbol: "symbol" sym  */
-#line 4292 "mrbgems/mruby-compiler/core/parse.y"
+#line 4307 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       p->lstate = EXPR_END;
                       (yyval.id) = (yyvsp[0].id);
                     }
-#line 10605 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10620 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 473: /* sym: tSTRING  */
-#line 4303 "mrbgems/mruby-compiler/core/parse.y"
+#line 4318 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.id) = new_strsym(p, (yyvsp[0].nd));
                     }
-#line 10613 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10628 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 474: /* sym: "string literal" tSTRING  */
-#line 4307 "mrbgems/mruby-compiler/core/parse.y"
+#line 4322 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.id) = new_strsym(p, (yyvsp[0].nd));
                     }
-#line 10621 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10636 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 475: /* symbols: tSYMBOLS_BEG tSTRING  */
-#line 4313 "mrbgems/mruby-compiler/core/parse.y"
+#line 4328 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_symbols(p, list1((yyvsp[0].nd)));
                     }
-#line 10629 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10644 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 476: /* symbols: tSYMBOLS_BEG string_rep tSTRING  */
-#line 4317 "mrbgems/mruby-compiler/core/parse.y"
+#line 4332 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       node *n = (yyvsp[-1].nd);
                       n = push(n, (yyvsp[0].nd));
                       (yyval.nd) = new_symbols(p, n);
                     }
-#line 10639 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10654 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 479: /* numeric: tUMINUS_NUM "integer literal"  */
-#line 4327 "mrbgems/mruby-compiler/core/parse.y"
+#line 4342 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_negate(p, (yyvsp[0].nd));
                     }
-#line 10647 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10662 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 480: /* numeric: tUMINUS_NUM "float literal"  */
-#line 4331 "mrbgems/mruby-compiler/core/parse.y"
+#line 4346 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_negate(p, (yyvsp[0].nd));
                     }
-#line 10655 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10670 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 481: /* variable: "local variable or method"  */
-#line 4337 "mrbgems/mruby-compiler/core/parse.y"
+#line 4352 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_xvar(p, (yyvsp[0].id), NODE_LVAR);
                     }
-#line 10663 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10678 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 482: /* variable: "instance variable"  */
-#line 4341 "mrbgems/mruby-compiler/core/parse.y"
+#line 4356 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_xvar(p, (yyvsp[0].id), NODE_IVAR);
                     }
-#line 10671 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10686 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 483: /* variable: "global variable"  */
-#line 4345 "mrbgems/mruby-compiler/core/parse.y"
+#line 4360 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_xvar(p, (yyvsp[0].id), NODE_GVAR);
                     }
-#line 10679 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10694 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 484: /* variable: "class variable"  */
-#line 4349 "mrbgems/mruby-compiler/core/parse.y"
+#line 4364 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_xvar(p, (yyvsp[0].id), NODE_CVAR);
                     }
-#line 10687 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10702 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 485: /* variable: "constant"  */
-#line 4353 "mrbgems/mruby-compiler/core/parse.y"
+#line 4368 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_const(p, (yyvsp[0].id));
                     }
-#line 10695 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10710 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 486: /* var_lhs: variable  */
-#line 4359 "mrbgems/mruby-compiler/core/parse.y"
+#line 4374 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       assignable(p, (yyvsp[0].nd));
                     }
-#line 10703 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10718 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 487: /* var_lhs: "numbered parameter"  */
-#line 4363 "mrbgems/mruby-compiler/core/parse.y"
+#line 4378 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       yyerror(&(yylsp[0]), p, "can't assign to numbered parameter");
                     }
-#line 10711 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10726 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 488: /* var_ref: variable  */
-#line 4369 "mrbgems/mruby-compiler/core/parse.y"
+#line 4384 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = var_reference(p, (yyvsp[0].nd));
                     }
-#line 10719 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10734 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 489: /* var_ref: "numbered parameter"  */
-#line 4373 "mrbgems/mruby-compiler/core/parse.y"
+#line 4388 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_nvar(p, (yyvsp[0].num));
                     }
-#line 10727 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10742 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 490: /* var_ref: "'nil'"  */
-#line 4377 "mrbgems/mruby-compiler/core/parse.y"
+#line 4392 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_nil(p);
                     }
-#line 10735 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10750 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 491: /* var_ref: "'self'"  */
-#line 4381 "mrbgems/mruby-compiler/core/parse.y"
+#line 4396 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_self(p);
                     }
-#line 10743 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10758 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 492: /* var_ref: "'true'"  */
-#line 4385 "mrbgems/mruby-compiler/core/parse.y"
+#line 4400 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_true(p);
                     }
-#line 10751 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10766 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 493: /* var_ref: "'false'"  */
-#line 4389 "mrbgems/mruby-compiler/core/parse.y"
+#line 4404 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_false(p);
                     }
-#line 10759 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10774 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 494: /* var_ref: "'__FILE__'"  */
-#line 4393 "mrbgems/mruby-compiler/core/parse.y"
+#line 4408 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       const char *fn = mrb_sym_name_len(p->mrb, p->filename_sym, NULL);
                       if (!fn) {
@@ -10767,686 +10782,686 @@ yyreduce:
                       }
                       (yyval.nd) = new_str(p, cons(cons(int_to_node(strlen(fn)), (node*)fn), (node*)NULL));
                     }
-#line 10771 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10786 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 495: /* var_ref: "'__LINE__'"  */
-#line 4401 "mrbgems/mruby-compiler/core/parse.y"
+#line 4416 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       char buf[16];
 
                       dump_int(p->lineno, buf);
                       (yyval.nd) = new_int(p, buf, 10, 0);
                     }
-#line 10782 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10797 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 496: /* var_ref: "'__ENCODING__'"  */
-#line 4408 "mrbgems/mruby-compiler/core/parse.y"
+#line 4423 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_fcall(p, MRB_SYM_2(p->mrb, __ENCODING__), 0);
                     }
-#line 10790 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10805 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 499: /* superclass: %empty  */
-#line 4418 "mrbgems/mruby-compiler/core/parse.y"
+#line 4433 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = 0;
                     }
-#line 10798 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10813 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 500: /* $@31: %empty  */
-#line 4422 "mrbgems/mruby-compiler/core/parse.y"
+#line 4437 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       p->lstate = EXPR_BEG;
                       p->cmd_start = TRUE;
                     }
-#line 10807 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10822 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 501: /* superclass: '<' $@31 expr_value term  */
-#line 4427 "mrbgems/mruby-compiler/core/parse.y"
+#line 4442 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-1].nd);
                     }
-#line 10815 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10830 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 504: /* f_arglist_paren: '(' f_args rparen  */
-#line 4443 "mrbgems/mruby-compiler/core/parse.y"
+#line 4458 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-1].nd);
                       p->lstate = EXPR_BEG;
                       p->cmd_start = TRUE;
                     }
-#line 10825 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10840 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 505: /* f_arglist_paren: '(' f_arg ',' tBDOT3 rparen  */
-#line 4449 "mrbgems/mruby-compiler/core/parse.y"
-                    {
-                      (yyval.nd) = new_args_dots(p, (yyvsp[-3].nd));
-                    }
-#line 10833 "mrbgems/mruby-compiler/core/y.tab.c"
-    break;
-
-  case 506: /* f_arglist_paren: '(' tBDOT3 rparen  */
-#line 4453 "mrbgems/mruby-compiler/core/parse.y"
-                    {
-                      (yyval.nd) = new_args_dots(p, 0);
-                    }
-#line 10841 "mrbgems/mruby-compiler/core/y.tab.c"
-    break;
-
-  case 508: /* f_arglist: f_args term  */
-#line 4460 "mrbgems/mruby-compiler/core/parse.y"
-                    {
-                      (yyval.nd) = (yyvsp[-1].nd);
-                    }
-#line 10849 "mrbgems/mruby-compiler/core/y.tab.c"
-    break;
-
-  case 509: /* f_arglist: f_arg ',' tBDOT3 term  */
 #line 4464 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args_dots(p, (yyvsp[-3].nd));
                     }
-#line 10857 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10848 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
-  case 510: /* f_arglist: "..." term  */
+  case 506: /* f_arglist_paren: '(' tBDOT3 rparen  */
 #line 4468 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args_dots(p, 0);
                     }
-#line 10865 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10856 "mrbgems/mruby-compiler/core/y.tab.c"
+    break;
+
+  case 508: /* f_arglist: f_args term  */
+#line 4475 "mrbgems/mruby-compiler/core/parse.y"
+                    {
+                      (yyval.nd) = (yyvsp[-1].nd);
+                    }
+#line 10864 "mrbgems/mruby-compiler/core/y.tab.c"
+    break;
+
+  case 509: /* f_arglist: f_arg ',' tBDOT3 term  */
+#line 4479 "mrbgems/mruby-compiler/core/parse.y"
+                    {
+                      (yyval.nd) = new_args_dots(p, (yyvsp[-3].nd));
+                    }
+#line 10872 "mrbgems/mruby-compiler/core/y.tab.c"
+    break;
+
+  case 510: /* f_arglist: "..." term  */
+#line 4483 "mrbgems/mruby-compiler/core/parse.y"
+                    {
+                      (yyval.nd) = new_args_dots(p, 0);
+                    }
+#line 10880 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 511: /* f_label: "local variable or method" "label"  */
-#line 4474 "mrbgems/mruby-compiler/core/parse.y"
+#line 4489 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       local_nest(p);
                     }
-#line 10873 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10888 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 512: /* f_label: "numbered parameter" "label"  */
-#line 4478 "mrbgems/mruby-compiler/core/parse.y"
+#line 4493 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       local_nest(p);
                     }
-#line 10881 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10896 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 513: /* f_kw: f_label arg  */
-#line 4484 "mrbgems/mruby-compiler/core/parse.y"
+#line 4499 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       void_expr_error(p, (yyvsp[0].nd));
                       (yyval.nd) = new_kw_arg(p, (yyvsp[-1].id), cons((yyvsp[0].nd), locals_node(p)));
                       local_unnest(p);
                     }
-#line 10891 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10906 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 514: /* f_kw: f_label  */
-#line 4490 "mrbgems/mruby-compiler/core/parse.y"
+#line 4505 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_kw_arg(p, (yyvsp[0].id), 0);
                       local_unnest(p);
                     }
-#line 10900 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10915 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 515: /* f_block_kw: f_label primary_value  */
-#line 4497 "mrbgems/mruby-compiler/core/parse.y"
+#line 4512 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       void_expr_error(p, (yyvsp[0].nd));
                       (yyval.nd) = new_kw_arg(p, (yyvsp[-1].id), cons((yyvsp[0].nd), locals_node(p)));
                       local_unnest(p);
                     }
-#line 10910 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10925 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 516: /* f_block_kw: f_label  */
-#line 4503 "mrbgems/mruby-compiler/core/parse.y"
+#line 4518 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_kw_arg(p, (yyvsp[0].id), 0);
                       local_unnest(p);
                     }
-#line 10919 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10934 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 517: /* f_block_kwarg: f_block_kw  */
-#line 4510 "mrbgems/mruby-compiler/core/parse.y"
+#line 4525 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1((yyvsp[0].nd));
                     }
-#line 10927 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10942 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 518: /* f_block_kwarg: f_block_kwarg ',' f_block_kw  */
-#line 4514 "mrbgems/mruby-compiler/core/parse.y"
+#line 4529 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push((yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 10935 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10950 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 519: /* f_kwarg: f_kw  */
-#line 4520 "mrbgems/mruby-compiler/core/parse.y"
+#line 4535 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1((yyvsp[0].nd));
                     }
-#line 10943 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10958 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 520: /* f_kwarg: f_kwarg ',' f_kw  */
-#line 4524 "mrbgems/mruby-compiler/core/parse.y"
+#line 4539 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push((yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 10951 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10966 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 523: /* f_kwrest: kwrest_mark "local variable or method"  */
-#line 4534 "mrbgems/mruby-compiler/core/parse.y"
+#line 4549 "mrbgems/mruby-compiler/core/parse.y"
                     {
-                      (yyval.nd) = new_kw_rest_args(p, (yyvsp[0].id));
+                      (yyval.id) = (yyvsp[0].id);
                     }
-#line 10959 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10974 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 524: /* f_kwrest: kwrest_mark  */
-#line 4538 "mrbgems/mruby-compiler/core/parse.y"
+#line 4553 "mrbgems/mruby-compiler/core/parse.y"
                     {
-                      (yyval.nd) = new_kw_rest_args(p, 0);
+                      (yyval.id) = intern_op(pow);
                     }
-#line 10967 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10982 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 525: /* args_tail: f_kwarg ',' f_kwrest opt_f_block_arg  */
-#line 4544 "mrbgems/mruby-compiler/core/parse.y"
+#line 4559 "mrbgems/mruby-compiler/core/parse.y"
                     {
-                      (yyval.nd) = new_args_tail(p, (yyvsp[-3].nd), (yyvsp[-1].nd), (yyvsp[0].id));
+                      (yyval.nd) = new_args_tail(p, (yyvsp[-3].nd), (yyvsp[-1].id), (yyvsp[0].id));
                     }
-#line 10975 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10990 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 526: /* args_tail: f_kwarg opt_f_block_arg  */
-#line 4548 "mrbgems/mruby-compiler/core/parse.y"
+#line 4563 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args_tail(p, (yyvsp[-1].nd), 0, (yyvsp[0].id));
                     }
-#line 10983 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10998 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 527: /* args_tail: f_kwrest opt_f_block_arg  */
-#line 4552 "mrbgems/mruby-compiler/core/parse.y"
+#line 4567 "mrbgems/mruby-compiler/core/parse.y"
                     {
-                      (yyval.nd) = new_args_tail(p, 0, (yyvsp[-1].nd), (yyvsp[0].id));
+                      (yyval.nd) = new_args_tail(p, 0, (yyvsp[-1].id), (yyvsp[0].id));
                     }
-#line 10991 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11006 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 528: /* args_tail: f_block_arg  */
-#line 4556 "mrbgems/mruby-compiler/core/parse.y"
+#line 4571 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args_tail(p, 0, 0, (yyvsp[0].id));
                     }
-#line 10999 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11014 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 529: /* opt_args_tail: ',' args_tail  */
-#line 4562 "mrbgems/mruby-compiler/core/parse.y"
+#line 4577 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[0].nd);
                     }
-#line 11007 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11022 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 530: /* opt_args_tail: %empty  */
-#line 4566 "mrbgems/mruby-compiler/core/parse.y"
+#line 4581 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args_tail(p, 0, 0, 0);
                     }
-#line 11015 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11030 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 531: /* f_args: f_arg ',' f_optarg ',' f_rest_arg opt_args_tail  */
-#line 4572 "mrbgems/mruby-compiler/core/parse.y"
+#line 4587 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, (yyvsp[-5].nd), (yyvsp[-3].nd), (yyvsp[-1].id), 0, (yyvsp[0].nd));
                     }
-#line 11023 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11038 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 532: /* f_args: f_arg ',' f_optarg ',' f_rest_arg ',' f_arg opt_args_tail  */
-#line 4576 "mrbgems/mruby-compiler/core/parse.y"
+#line 4591 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, (yyvsp[-7].nd), (yyvsp[-5].nd), (yyvsp[-3].id), (yyvsp[-1].nd), (yyvsp[0].nd));
                     }
-#line 11031 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11046 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 533: /* f_args: f_arg ',' f_optarg opt_args_tail  */
-#line 4580 "mrbgems/mruby-compiler/core/parse.y"
+#line 4595 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, (yyvsp[-3].nd), (yyvsp[-1].nd), 0, 0, (yyvsp[0].nd));
                     }
-#line 11039 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11054 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 534: /* f_args: f_arg ',' f_optarg ',' f_arg opt_args_tail  */
-#line 4584 "mrbgems/mruby-compiler/core/parse.y"
+#line 4599 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, (yyvsp[-5].nd), (yyvsp[-3].nd), 0, (yyvsp[-1].nd), (yyvsp[0].nd));
                     }
-#line 11047 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11062 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 535: /* f_args: f_arg ',' f_rest_arg opt_args_tail  */
-#line 4588 "mrbgems/mruby-compiler/core/parse.y"
+#line 4603 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, (yyvsp[-3].nd), 0, (yyvsp[-1].id), 0, (yyvsp[0].nd));
                     }
-#line 11055 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11070 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 536: /* f_args: f_arg ',' f_rest_arg ',' f_arg opt_args_tail  */
-#line 4592 "mrbgems/mruby-compiler/core/parse.y"
+#line 4607 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, (yyvsp[-5].nd), 0, (yyvsp[-3].id), (yyvsp[-1].nd), (yyvsp[0].nd));
                     }
-#line 11063 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11078 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 537: /* f_args: f_arg opt_args_tail  */
-#line 4596 "mrbgems/mruby-compiler/core/parse.y"
+#line 4611 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, (yyvsp[-1].nd), 0, 0, 0, (yyvsp[0].nd));
                     }
-#line 11071 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11086 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 538: /* f_args: f_optarg ',' f_rest_arg opt_args_tail  */
-#line 4600 "mrbgems/mruby-compiler/core/parse.y"
+#line 4615 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, 0, (yyvsp[-3].nd), (yyvsp[-1].id), 0, (yyvsp[0].nd));
                     }
-#line 11079 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11094 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 539: /* f_args: f_optarg ',' f_rest_arg ',' f_arg opt_args_tail  */
-#line 4604 "mrbgems/mruby-compiler/core/parse.y"
+#line 4619 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, 0, (yyvsp[-5].nd), (yyvsp[-3].id), (yyvsp[-1].nd), (yyvsp[0].nd));
                     }
-#line 11087 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11102 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 540: /* f_args: f_optarg opt_args_tail  */
-#line 4608 "mrbgems/mruby-compiler/core/parse.y"
+#line 4623 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, 0, (yyvsp[-1].nd), 0, 0, (yyvsp[0].nd));
                     }
-#line 11095 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11110 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 541: /* f_args: f_optarg ',' f_arg opt_args_tail  */
-#line 4612 "mrbgems/mruby-compiler/core/parse.y"
+#line 4627 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, 0, (yyvsp[-3].nd), 0, (yyvsp[-1].nd), (yyvsp[0].nd));
                     }
-#line 11103 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11118 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 542: /* f_args: f_rest_arg opt_args_tail  */
-#line 4616 "mrbgems/mruby-compiler/core/parse.y"
+#line 4631 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, 0, 0, (yyvsp[-1].id), 0, (yyvsp[0].nd));
                     }
-#line 11111 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11126 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 543: /* f_args: f_rest_arg ',' f_arg opt_args_tail  */
-#line 4620 "mrbgems/mruby-compiler/core/parse.y"
+#line 4635 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, 0, 0, (yyvsp[-3].id), (yyvsp[-1].nd), (yyvsp[0].nd));
                     }
-#line 11119 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11134 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 544: /* f_args: args_tail  */
-#line 4624 "mrbgems/mruby-compiler/core/parse.y"
+#line 4639 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, 0, 0, 0, 0, (yyvsp[0].nd));
                     }
-#line 11127 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11142 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 545: /* f_args: %empty  */
-#line 4628 "mrbgems/mruby-compiler/core/parse.y"
+#line 4643 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       local_add_f(p, 0);
                       (yyval.nd) = new_args(p, 0, 0, 0, 0, 0);
                     }
-#line 11136 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11151 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 546: /* f_bad_arg: "constant"  */
-#line 4635 "mrbgems/mruby-compiler/core/parse.y"
+#line 4650 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       yyerror(&(yylsp[0]), p, "formal argument cannot be a constant");
                       (yyval.nd) = 0;
                     }
-#line 11145 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11160 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 547: /* f_bad_arg: "instance variable"  */
-#line 4640 "mrbgems/mruby-compiler/core/parse.y"
+#line 4655 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       yyerror(&(yylsp[0]), p, "formal argument cannot be an instance variable");
                       (yyval.nd) = 0;
                     }
-#line 11154 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11169 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 548: /* f_bad_arg: "global variable"  */
-#line 4645 "mrbgems/mruby-compiler/core/parse.y"
+#line 4660 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       yyerror(&(yylsp[0]), p, "formal argument cannot be a global variable");
                       (yyval.nd) = 0;
                     }
-#line 11163 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11178 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 549: /* f_bad_arg: "class variable"  */
-#line 4650 "mrbgems/mruby-compiler/core/parse.y"
+#line 4665 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       yyerror(&(yylsp[0]), p, "formal argument cannot be a class variable");
                       (yyval.nd) = 0;
                     }
-#line 11172 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11187 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 550: /* f_bad_arg: "numbered parameter"  */
-#line 4655 "mrbgems/mruby-compiler/core/parse.y"
+#line 4670 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       yyerror(&(yylsp[0]), p, "formal argument cannot be a numbered parameter");
                       (yyval.nd) = 0;
                     }
-#line 11181 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11196 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 551: /* f_norm_arg: f_bad_arg  */
-#line 4662 "mrbgems/mruby-compiler/core/parse.y"
+#line 4677 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.id) = 0;
                     }
-#line 11189 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11204 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 552: /* f_norm_arg: "local variable or method"  */
-#line 4666 "mrbgems/mruby-compiler/core/parse.y"
+#line 4681 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       local_add_f(p, (yyvsp[0].id));
                       (yyval.id) = (yyvsp[0].id);
                     }
-#line 11198 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11213 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 553: /* f_arg_item: f_norm_arg  */
-#line 4673 "mrbgems/mruby-compiler/core/parse.y"
+#line 4688 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_arg(p, (yyvsp[0].id));
                     }
-#line 11206 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11221 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 554: /* @32: %empty  */
-#line 4677 "mrbgems/mruby-compiler/core/parse.y"
+#line 4692 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = local_switch(p);
                     }
-#line 11214 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11229 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 555: /* f_arg_item: tLPAREN @32 f_margs rparen  */
-#line 4681 "mrbgems/mruby-compiler/core/parse.y"
+#line 4696 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_masgn_param(p, (yyvsp[-1].nd), p->locals->car);
                       local_resume(p, (yyvsp[-2].nd));
                       local_add_f(p, 0);
                     }
-#line 11224 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11239 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 556: /* f_arg: f_arg_item  */
-#line 4689 "mrbgems/mruby-compiler/core/parse.y"
+#line 4704 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1((yyvsp[0].nd));
                     }
-#line 11232 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11247 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 557: /* f_arg: f_arg ',' f_arg_item  */
-#line 4693 "mrbgems/mruby-compiler/core/parse.y"
+#line 4708 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push((yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 11240 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11255 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 558: /* f_opt_asgn: "local variable or method" '='  */
-#line 4699 "mrbgems/mruby-compiler/core/parse.y"
+#line 4714 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       local_add_f(p, (yyvsp[-1].id));
                       local_nest(p);
                       (yyval.id) = (yyvsp[-1].id);
                     }
-#line 11250 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11265 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 559: /* f_opt: f_opt_asgn arg  */
-#line 4707 "mrbgems/mruby-compiler/core/parse.y"
+#line 4722 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       void_expr_error(p, (yyvsp[0].nd));
                       (yyval.nd) = cons(sym_to_node((yyvsp[-1].id)), cons((yyvsp[0].nd), locals_node(p)));
                       local_unnest(p);
                     }
-#line 11260 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11275 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 560: /* f_block_opt: f_opt_asgn primary_value  */
-#line 4715 "mrbgems/mruby-compiler/core/parse.y"
+#line 4730 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       void_expr_error(p, (yyvsp[0].nd));
                       (yyval.nd) = cons(sym_to_node((yyvsp[-1].id)), cons((yyvsp[0].nd), locals_node(p)));
                       local_unnest(p);
                     }
-#line 11270 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11285 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 561: /* f_block_optarg: f_block_opt  */
-#line 4723 "mrbgems/mruby-compiler/core/parse.y"
+#line 4738 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1((yyvsp[0].nd));
                     }
-#line 11278 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11293 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 562: /* f_block_optarg: f_block_optarg ',' f_block_opt  */
-#line 4727 "mrbgems/mruby-compiler/core/parse.y"
+#line 4742 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push((yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 11286 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11301 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 563: /* f_optarg: f_opt  */
-#line 4733 "mrbgems/mruby-compiler/core/parse.y"
+#line 4748 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1((yyvsp[0].nd));
                     }
-#line 11294 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11309 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 564: /* f_optarg: f_optarg ',' f_opt  */
-#line 4737 "mrbgems/mruby-compiler/core/parse.y"
+#line 4752 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push((yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 11302 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11317 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 567: /* f_rest_arg: restarg_mark "local variable or method"  */
-#line 4747 "mrbgems/mruby-compiler/core/parse.y"
+#line 4762 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       local_add_f(p, (yyvsp[0].id));
                       (yyval.id) = (yyvsp[0].id);
                     }
-#line 11311 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11326 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 568: /* f_rest_arg: restarg_mark  */
-#line 4752 "mrbgems/mruby-compiler/core/parse.y"
+#line 4767 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.id) = intern_op(mul);
                       local_add_f(p, (yyval.id));
                     }
-#line 11320 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11335 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 571: /* f_block_arg: blkarg_mark "local variable or method"  */
-#line 4763 "mrbgems/mruby-compiler/core/parse.y"
+#line 4778 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.id) = (yyvsp[0].id);
                     }
-#line 11328 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11343 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 572: /* f_block_arg: blkarg_mark  */
-#line 4767 "mrbgems/mruby-compiler/core/parse.y"
+#line 4782 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.id) = intern_op(and);
                     }
-#line 11336 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11351 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 573: /* opt_f_block_arg: ',' f_block_arg  */
-#line 4773 "mrbgems/mruby-compiler/core/parse.y"
+#line 4788 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.id) = (yyvsp[0].id);
                     }
-#line 11344 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11359 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 574: /* opt_f_block_arg: none  */
-#line 4777 "mrbgems/mruby-compiler/core/parse.y"
+#line 4792 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.id) = 0;
                     }
-#line 11352 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11367 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 575: /* singleton: var_ref  */
-#line 4783 "mrbgems/mruby-compiler/core/parse.y"
+#line 4798 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       prohibit_literals(p, (yyvsp[0].nd));
                       (yyval.nd) = (yyvsp[0].nd);
                       if (!(yyval.nd)) (yyval.nd) = new_nil(p);
                     }
-#line 11362 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11377 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 576: /* $@33: %empty  */
-#line 4788 "mrbgems/mruby-compiler/core/parse.y"
+#line 4803 "mrbgems/mruby-compiler/core/parse.y"
                       {p->lstate = EXPR_BEG;}
-#line 11368 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11383 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 577: /* singleton: '(' $@33 expr rparen  */
-#line 4789 "mrbgems/mruby-compiler/core/parse.y"
+#line 4804 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       prohibit_literals(p, (yyvsp[-1].nd));
                       (yyval.nd) = (yyvsp[-1].nd);
                     }
-#line 11377 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11392 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 579: /* assoc_list: assocs trailer  */
-#line 4797 "mrbgems/mruby-compiler/core/parse.y"
+#line 4812 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-1].nd);
                     }
-#line 11385 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11400 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 580: /* assocs: assoc  */
-#line 4803 "mrbgems/mruby-compiler/core/parse.y"
+#line 4818 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1((yyvsp[0].nd));
                     }
-#line 11393 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11408 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 581: /* assocs: assocs comma assoc  */
-#line 4807 "mrbgems/mruby-compiler/core/parse.y"
+#line 4822 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push((yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 11401 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11416 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 582: /* assoc: arg "=>" arg  */
-#line 4813 "mrbgems/mruby-compiler/core/parse.y"
+#line 4828 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       void_expr_error(p, (yyvsp[-2].nd));
                       void_expr_error(p, (yyvsp[0].nd));
                       (yyval.nd) = cons((yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 11411 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11426 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 583: /* assoc: "local variable or method" "label" arg  */
-#line 4819 "mrbgems/mruby-compiler/core/parse.y"
+#line 4834 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       void_expr_error(p, (yyvsp[0].nd));
                       (yyval.nd) = cons(new_sym(p, (yyvsp[-2].id)), (yyvsp[0].nd));
                     }
-#line 11420 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11435 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 584: /* assoc: "local variable or method" "label"  */
-#line 4824 "mrbgems/mruby-compiler/core/parse.y"
+#line 4839 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = cons(new_sym(p, (yyvsp[-1].id)), label_reference(p, (yyvsp[-1].id)));
                     }
-#line 11428 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11443 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 585: /* assoc: "numbered parameter" "label"  */
-#line 4828 "mrbgems/mruby-compiler/core/parse.y"
+#line 4843 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       mrb_sym sym = intern_numparam((yyvsp[-1].num));
                       (yyval.nd) = cons(new_sym(p, sym), label_reference(p, sym));
                     }
-#line 11437 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11452 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 586: /* assoc: "numbered parameter" "label" arg  */
-#line 4833 "mrbgems/mruby-compiler/core/parse.y"
+#line 4848 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       void_expr_error(p, (yyvsp[0].nd));
                       (yyval.nd) = cons(new_sym(p, intern_numparam((yyvsp[-2].num))), (yyvsp[0].nd));
                     }
-#line 11446 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11461 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 587: /* assoc: string_fragment "label" arg  */
-#line 4838 "mrbgems/mruby-compiler/core/parse.y"
+#line 4853 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       void_expr_error(p, (yyvsp[0].nd));
                       if ((yyvsp[-2].nd)->cdr) {
@@ -11462,75 +11477,75 @@ yyreduce:
                         (yyval.nd) = cons(new_sym(p, new_strsym(p, (yyvsp[-2].nd)->car)), (yyvsp[0].nd));
                       }
                     }
-#line 11466 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11481 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 588: /* assoc: "**" arg  */
-#line 4854 "mrbgems/mruby-compiler/core/parse.y"
+#line 4869 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       void_expr_error(p, (yyvsp[0].nd));
                       (yyval.nd) = cons(new_kw_rest_args(p, 0), (yyvsp[0].nd));
                     }
-#line 11475 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11490 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 589: /* assoc: "**"  */
-#line 4859 "mrbgems/mruby-compiler/core/parse.y"
+#line 4874 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = cons(new_kw_rest_args(p, 0), new_xvar(p, intern_op(pow), NODE_LVAR));
                     }
-#line 11483 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11498 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 602: /* call_op: '.'  */
-#line 4885 "mrbgems/mruby-compiler/core/parse.y"
+#line 4900 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.num) = '.';
                     }
-#line 11491 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11506 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 603: /* call_op: "&."  */
-#line 4889 "mrbgems/mruby-compiler/core/parse.y"
+#line 4904 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.num) = 0;
                     }
-#line 11499 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11514 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 605: /* call_op2: "::"  */
-#line 4896 "mrbgems/mruby-compiler/core/parse.y"
+#line 4911 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.num) = tCOLON2;
                     }
-#line 11507 "mrbgems/mruby-compiler/core/y.tab.c"
-    break;
-
-  case 614: /* term: ';'  */
-#line 4917 "mrbgems/mruby-compiler/core/parse.y"
-                      {yyerrok;}
-#line 11513 "mrbgems/mruby-compiler/core/y.tab.c"
-    break;
-
-  case 616: /* nl: '\n'  */
-#line 4922 "mrbgems/mruby-compiler/core/parse.y"
-                    {
-                      p->lineno += (yyvsp[0].num);
-                      p->column = 0;
-                    }
 #line 11522 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
+  case 614: /* term: ';'  */
+#line 4932 "mrbgems/mruby-compiler/core/parse.y"
+                      {yyerrok;}
+#line 11528 "mrbgems/mruby-compiler/core/y.tab.c"
+    break;
+
+  case 616: /* nl: '\n'  */
+#line 4937 "mrbgems/mruby-compiler/core/parse.y"
+                    {
+                      p->lineno += (yyvsp[0].num);
+                      p->column = 0;
+                    }
+#line 11537 "mrbgems/mruby-compiler/core/y.tab.c"
+    break;
+
   case 620: /* none: %empty  */
-#line 4934 "mrbgems/mruby-compiler/core/parse.y"
+#line 4949 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = 0;
                     }
-#line 11530 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11545 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
 
-#line 11534 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11549 "mrbgems/mruby-compiler/core/y.tab.c"
 
       default: break;
     }
@@ -11763,7 +11778,7 @@ yyreturnlab:
   return yyresult;
 }
 
-#line 4938 "mrbgems/mruby-compiler/core/parse.y"
+#line 4953 "mrbgems/mruby-compiler/core/parse.y"
 
 #define pylval  (*((YYSTYPE*)(p->ylval)))