diff --git a/mrbgems/mruby-compiler/core/codegen.c b/mrbgems/mruby-compiler/core/codegen.c
index 4cf0c50c8..678c95146 100644
--- a/mrbgems/mruby-compiler/core/codegen.c
+++ b/mrbgems/mruby-compiler/core/codegen.c
@@ -4644,25 +4644,6 @@ codegen_undef(codegen_scope *s, node *tree, int val)
   gen_load_nil(s, val);
 }
 
-static void
-codegen_return(codegen_scope *s, node *tree, int val)
-{
-  if (tree) {
-    gen_retval(s, tree);
-  }
-  else {
-    genop_1(s, OP_LOADNIL, cursp());
-  }
-  if (s->loop) {
-    gen_return(s, OP_RETURN_BLK, cursp());
-  }
-  else {
-    gen_return(s, OP_RETURN, cursp());
-  }
-  if (!val) return;
-  push();
-}
-
 static void
 codegen_break(codegen_scope *s, node *tree, int val)
 {
@@ -5267,8 +5248,20 @@ gen_return_var(codegen_scope *s, node *varnode, int val)
   struct mrb_ast_return_node *return_n = return_node(varnode);
   node *args = RETURN_NODE_ARGS(return_n);
 
-  /* Use traditional return codegen logic */
-  codegen_return(s, args, val);
+  if (args) {
+    gen_retval(s, args);
+  }
+  else {
+    genop_1(s, OP_LOADNIL, cursp());
+  }
+  if (s->loop) {
+    gen_return(s, OP_RETURN_BLK, cursp());
+  }
+  else {
+    gen_return(s, OP_RETURN, cursp());
+  }
+  if (!val) return;
+  push();
 }
 
 static void
@@ -6465,10 +6458,6 @@ codegen(codegen_scope *s, node *tree, int val)
     codegen_op_asgn(s, tree, val);
     break;
 
-  case NODE_RETURN:
-    codegen_return(s, tree, val);
-    break;
-
   case NODE_BREAK:
     codegen_break(s, tree, val);
     break;
diff --git a/mrbgems/mruby-compiler/core/parse.y b/mrbgems/mruby-compiler/core/parse.y
index c4aae55eb..eb8049ef6 100644
--- a/mrbgems/mruby-compiler/core/parse.y
+++ b/mrbgems/mruby-compiler/core/parse.y
@@ -610,7 +610,6 @@ static node* new_masgn_var(parser_state *p, node *lhs, node *rhs);
 static node* new_op_asgn_var(parser_state *p, node *lhs, mrb_sym op, node *rhs);
 static node* new_and_var(parser_state *p, node *left, node *right);
 static node* new_or_var(parser_state *p, node *left, node *right);
-static node* new_return_var(parser_state *p, node *args);
 static node* new_float_var(parser_state *p, const char *value);
 
 /* (:if cond then else) */
@@ -1151,19 +1150,6 @@ new_or_var(parser_state *p, node *left, node *right)
   return cons_head((node*)NODE_VARIABLE, (node*)n);
 }
 
-static node*
-new_return_var(parser_state *p, node *args)
-{
-  size_t total_size = sizeof(struct mrb_ast_return_node);
-  enum mrb_ast_size_class class = size_to_class(total_size);
-
-  struct mrb_ast_return_node *n = (struct mrb_ast_return_node*)parser_alloc_var(p, total_size, class);
-
-  init_var_header(&n->header, p, NODE_RETURN, class);
-  n->args = args;
-
-  return cons_head((node*)NODE_VARIABLE, (node*)n);
-}
 
 
 /* Variable-sized literal node creation functions */
@@ -1352,10 +1338,15 @@ new_yield(parser_state *p, node *c)
 static node*
 new_return(parser_state *p, node *c)
 {
-  if (p->var_nodes_enabled) {
-    return new_return_var(p, c);
-  }
-  return cons_head((node*)NODE_RETURN, c);
+  size_t total_size = sizeof(struct mrb_ast_return_node);
+  enum mrb_ast_size_class class = size_to_class(total_size);
+
+  struct mrb_ast_return_node *n = (struct mrb_ast_return_node*)parser_alloc_var(p, total_size, class);
+
+  init_var_header(&n->header, p, NODE_RETURN, class);
+  n->args = c;
+
+  return cons_head((node*)NODE_VARIABLE, (node*)n);
 }
 
 /* (:break . c) */
@@ -2319,6 +2310,13 @@ call_with_block(parser_state *p, node *a, node *b)
         yyerror(NULL, p, "block given to yield");
         return;
       }
+      else if (var_type == NODE_RETURN) {
+        /* Variable-sized return nodes - recursively call with args */
+        struct mrb_ast_return_node *return_n = return_node(a->cdr);
+        if (return_n->args == NULL) return;
+        call_with_block(p, return_n->args, b);
+        return;
+      }
     }
     /* For other variable-sized nodes, fall through to default */
     break;
@@ -2330,7 +2328,6 @@ call_with_block(parser_state *p, node *a, node *b)
     if (!n->car) n->car = new_callargs(p, 0, 0, b);
     else args_with_block(p, n->car, b);
     break;
-  case NODE_RETURN:
   case NODE_BREAK:
   case NODE_NEXT:
     if (a->cdr == NULL) return;
diff --git a/mrbgems/mruby-compiler/core/y.tab.c b/mrbgems/mruby-compiler/core/y.tab.c
index 0fffe06e1..a43b82135 100644
--- a/mrbgems/mruby-compiler/core/y.tab.c
+++ b/mrbgems/mruby-compiler/core/y.tab.c
@@ -672,7 +672,6 @@ static node* new_masgn_var(parser_state *p, node *lhs, node *rhs);
 static node* new_op_asgn_var(parser_state *p, node *lhs, mrb_sym op, node *rhs);
 static node* new_and_var(parser_state *p, node *left, node *right);
 static node* new_or_var(parser_state *p, node *left, node *right);
-static node* new_return_var(parser_state *p, node *args);
 static node* new_float_var(parser_state *p, const char *value);
 
 /* (:if cond then else) */
@@ -1213,19 +1212,6 @@ new_or_var(parser_state *p, node *left, node *right)
   return cons_head((node*)NODE_VARIABLE, (node*)n);
 }
 
-static node*
-new_return_var(parser_state *p, node *args)
-{
-  size_t total_size = sizeof(struct mrb_ast_return_node);
-  enum mrb_ast_size_class class = size_to_class(total_size);
-
-  struct mrb_ast_return_node *n = (struct mrb_ast_return_node*)parser_alloc_var(p, total_size, class);
-
-  init_var_header(&n->header, p, NODE_RETURN, class);
-  n->args = args;
-
-  return cons_head((node*)NODE_VARIABLE, (node*)n);
-}
 
 
 /* Variable-sized literal node creation functions */
@@ -1414,10 +1400,15 @@ new_yield(parser_state *p, node *c)
 static node*
 new_return(parser_state *p, node *c)
 {
-  if (p->var_nodes_enabled) {
-    return new_return_var(p, c);
-  }
-  return cons_head((node*)NODE_RETURN, c);
+  size_t total_size = sizeof(struct mrb_ast_return_node);
+  enum mrb_ast_size_class class = size_to_class(total_size);
+
+  struct mrb_ast_return_node *n = (struct mrb_ast_return_node*)parser_alloc_var(p, total_size, class);
+
+  init_var_header(&n->header, p, NODE_RETURN, class);
+  n->args = c;
+
+  return cons_head((node*)NODE_VARIABLE, (node*)n);
 }
 
 /* (:break . c) */
@@ -2381,6 +2372,13 @@ call_with_block(parser_state *p, node *a, node *b)
         yyerror(NULL, p, "block given to yield");
         return;
       }
+      else if (var_type == NODE_RETURN) {
+        /* Variable-sized return nodes - recursively call with args */
+        struct mrb_ast_return_node *return_n = return_node(a->cdr);
+        if (return_n->args == NULL) return;
+        call_with_block(p, return_n->args, b);
+        return;
+      }
     }
     /* For other variable-sized nodes, fall through to default */
     break;
@@ -2392,7 +2390,6 @@ call_with_block(parser_state *p, node *a, node *b)
     if (!n->car) n->car = new_callargs(p, 0, 0, b);
     else args_with_block(p, n->car, b);
     break;
-  case NODE_RETURN:
   case NODE_BREAK:
   case NODE_NEXT:
     if (a->cdr == NULL) return;
@@ -2589,7 +2586,7 @@ prohibit_literals(parser_state *p, node *n)
 /* xxx ----------------------------- */
 
 
-#line 2593 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 2590 "mrbgems/mruby-compiler/core/y.tab.c"
 
 # ifndef YY_CAST
 #  ifdef __cplusplus
@@ -2760,7 +2757,7 @@ extern int yydebug;
 #if ! defined YYSTYPE && ! defined YYSTYPE_IS_DECLARED
 union YYSTYPE
 {
-#line 2536 "mrbgems/mruby-compiler/core/parse.y"
+#line 2533 "mrbgems/mruby-compiler/core/parse.y"
 
     node *nd;
     mrb_sym id;
@@ -2768,7 +2765,7 @@ union YYSTYPE
     stack_type stack;
     const struct vtable *vars;
 
-#line 2772 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 2769 "mrbgems/mruby-compiler/core/y.tab.c"
 
 };
 typedef union YYSTYPE YYSTYPE;
@@ -3527,69 +3524,69 @@ static const yytype_uint8 yytranslate[] =
 /* YYRLINE[YYN] -- Source line where rule number YYN was defined.  */
 static const yytype_int16 yyrline[] =
 {
-       0,  2707,  2707,  2707,  2717,  2723,  2727,  2731,  2735,  2741,
-    2743,  2742,  2756,  2782,  2788,  2792,  2796,  2800,  2806,  2806,
-    2810,  2814,  2818,  2822,  2831,  2840,  2844,  2849,  2850,  2854,
-    2858,  2862,  2866,  2872,  2875,  2879,  2883,  2887,  2891,  2895,
-    2900,  2904,  2913,  2922,  2931,  2940,  2947,  2948,  2952,  2956,
-    2957,  2961,  2965,  2969,  2973,  2977,  2987,  2986,  3001,  3010,
-    3011,  3014,  3015,  3022,  3021,  3036,  3040,  3045,  3049,  3054,
-    3058,  3063,  3067,  3071,  3075,  3079,  3085,  3089,  3095,  3096,
-    3102,  3106,  3110,  3114,  3118,  3122,  3126,  3130,  3134,  3138,
-    3144,  3145,  3151,  3155,  3161,  3165,  3171,  3175,  3179,  3183,
-    3187,  3191,  3197,  3203,  3210,  3214,  3218,  3222,  3226,  3230,
-    3236,  3242,  3247,  3253,  3257,  3260,  3264,  3268,  3275,  3276,
-    3277,  3278,  3283,  3290,  3291,  3294,  3298,  3298,  3304,  3305,
-    3306,  3307,  3308,  3309,  3310,  3311,  3312,  3313,  3314,  3315,
-    3316,  3317,  3318,  3319,  3320,  3321,  3322,  3323,  3324,  3325,
-    3326,  3327,  3328,  3329,  3330,  3331,  3332,  3333,  3336,  3336,
-    3336,  3337,  3337,  3338,  3338,  3338,  3339,  3339,  3339,  3339,
-    3340,  3340,  3340,  3341,  3341,  3341,  3342,  3342,  3342,  3342,
-    3343,  3343,  3343,  3343,  3344,  3344,  3344,  3344,  3345,  3345,
-    3345,  3345,  3346,  3346,  3346,  3346,  3347,  3347,  3350,  3354,
-    3358,  3362,  3366,  3370,  3374,  3379,  3384,  3389,  3393,  3397,
-    3401,  3405,  3409,  3413,  3417,  3421,  3425,  3429,  3433,  3437,
-    3441,  3445,  3449,  3453,  3457,  3461,  3465,  3469,  3473,  3477,
-    3481,  3485,  3489,  3493,  3497,  3501,  3505,  3509,  3513,  3517,
-    3521,  3525,  3529,  3533,  3537,  3546,  3555,  3564,  3573,  3579,
-    3580,  3584,  3588,  3594,  3598,  3605,  3609,  3618,  3635,  3636,
-    3639,  3640,  3641,  3645,  3649,  3655,  3660,  3664,  3668,  3672,
-    3678,  3678,  3689,  3693,  3699,  3703,  3709,  3712,  3717,  3721,
-    3725,  3730,  3734,  3740,  3745,  3749,  3755,  3756,  3760,  3764,
-    3765,  3766,  3767,  3768,  3773,  3772,  3784,  3788,  3783,  3793,
-    3793,  3797,  3801,  3805,  3809,  3813,  3817,  3821,  3825,  3829,
-    3833,  3837,  3838,  3844,  3851,  3843,  3864,  3872,  3880,  3880,
-    3880,  3887,  3887,  3887,  3894,  3900,  3905,  3907,  3904,  3916,
-    3914,  3932,  3937,  3930,  3954,  3952,  3968,  3978,  3989,  3993,
-    3997,  4001,  4007,  4014,  4015,  4016,  4019,  4020,  4023,  4024,
-    4032,  4033,  4039,  4043,  4046,  4050,  4054,  4058,  4063,  4067,
-    4071,  4075,  4081,  4080,  4090,  4094,  4098,  4102,  4108,  4113,
-    4118,  4122,  4126,  4130,  4134,  4138,  4142,  4146,  4150,  4154,
-    4158,  4162,  4166,  4170,  4174,  4180,  4185,  4192,  4192,  4196,
-    4201,  4208,  4212,  4218,  4219,  4222,  4227,  4230,  4234,  4240,
-    4244,  4251,  4250,  4267,  4272,  4276,  4281,  4288,  4292,  4296,
-    4300,  4304,  4308,  4312,  4316,  4320,  4327,  4326,  4341,  4340,
-    4356,  4364,  4373,  4376,  4383,  4386,  4390,  4391,  4394,  4398,
-    4401,  4405,  4408,  4409,  4410,  4411,  4414,  4415,  4421,  4426,
-    4431,  4436,  4442,  4443,  4449,  4455,  4454,  4466,  4470,  4476,
-    4480,  4486,  4495,  4506,  4509,  4510,  4513,  4519,  4525,  4526,
-    4529,  4536,  4535,  4550,  4554,  4563,  4567,  4579,  4586,  4593,
-    4594,  4595,  4596,  4597,  4601,  4607,  4611,  4619,  4620,  4621,
-    4625,  4631,  4635,  4639,  4643,  4647,  4653,  4657,  4663,  4667,
-    4671,  4675,  4679,  4683,  4687,  4695,  4702,  4708,  4709,  4713,
-    4717,  4716,  4733,  4734,  4737,  4743,  4747,  4753,  4754,  4758,
-    4762,  4768,  4772,  4778,  4784,  4791,  4797,  4804,  4808,  4814,
-    4818,  4824,  4825,  4828,  4832,  4838,  4842,  4846,  4850,  4856,
-    4861,  4866,  4870,  4874,  4878,  4882,  4886,  4890,  4894,  4898,
-    4902,  4906,  4910,  4914,  4918,  4923,  4929,  4934,  4939,  4944,
-    4949,  4956,  4960,  4967,  4972,  4971,  4983,  4987,  4993,  5001,
-    5009,  5017,  5021,  5027,  5031,  5037,  5038,  5041,  5046,  5053,
-    5054,  5057,  5061,  5067,  5071,  5077,  5083,  5083,  5090,  5091,
-    5097,  5101,  5107,  5113,  5118,  5122,  5127,  5132,  5148,  5153,
-    5159,  5160,  5161,  5164,  5165,  5166,  5167,  5170,  5171,  5172,
-    5175,  5176,  5179,  5183,  5189,  5190,  5196,  5197,  5200,  5201,
-    5204,  5207,  5208,  5209,  5212,  5213,  5216,  5221,  5224,  5225,
-    5229
+       0,  2704,  2704,  2704,  2714,  2720,  2724,  2728,  2732,  2738,
+    2740,  2739,  2753,  2779,  2785,  2789,  2793,  2797,  2803,  2803,
+    2807,  2811,  2815,  2819,  2828,  2837,  2841,  2846,  2847,  2851,
+    2855,  2859,  2863,  2869,  2872,  2876,  2880,  2884,  2888,  2892,
+    2897,  2901,  2910,  2919,  2928,  2937,  2944,  2945,  2949,  2953,
+    2954,  2958,  2962,  2966,  2970,  2974,  2984,  2983,  2998,  3007,
+    3008,  3011,  3012,  3019,  3018,  3033,  3037,  3042,  3046,  3051,
+    3055,  3060,  3064,  3068,  3072,  3076,  3082,  3086,  3092,  3093,
+    3099,  3103,  3107,  3111,  3115,  3119,  3123,  3127,  3131,  3135,
+    3141,  3142,  3148,  3152,  3158,  3162,  3168,  3172,  3176,  3180,
+    3184,  3188,  3194,  3200,  3207,  3211,  3215,  3219,  3223,  3227,
+    3233,  3239,  3244,  3250,  3254,  3257,  3261,  3265,  3272,  3273,
+    3274,  3275,  3280,  3287,  3288,  3291,  3295,  3295,  3301,  3302,
+    3303,  3304,  3305,  3306,  3307,  3308,  3309,  3310,  3311,  3312,
+    3313,  3314,  3315,  3316,  3317,  3318,  3319,  3320,  3321,  3322,
+    3323,  3324,  3325,  3326,  3327,  3328,  3329,  3330,  3333,  3333,
+    3333,  3334,  3334,  3335,  3335,  3335,  3336,  3336,  3336,  3336,
+    3337,  3337,  3337,  3338,  3338,  3338,  3339,  3339,  3339,  3339,
+    3340,  3340,  3340,  3340,  3341,  3341,  3341,  3341,  3342,  3342,
+    3342,  3342,  3343,  3343,  3343,  3343,  3344,  3344,  3347,  3351,
+    3355,  3359,  3363,  3367,  3371,  3376,  3381,  3386,  3390,  3394,
+    3398,  3402,  3406,  3410,  3414,  3418,  3422,  3426,  3430,  3434,
+    3438,  3442,  3446,  3450,  3454,  3458,  3462,  3466,  3470,  3474,
+    3478,  3482,  3486,  3490,  3494,  3498,  3502,  3506,  3510,  3514,
+    3518,  3522,  3526,  3530,  3534,  3543,  3552,  3561,  3570,  3576,
+    3577,  3581,  3585,  3591,  3595,  3602,  3606,  3615,  3632,  3633,
+    3636,  3637,  3638,  3642,  3646,  3652,  3657,  3661,  3665,  3669,
+    3675,  3675,  3686,  3690,  3696,  3700,  3706,  3709,  3714,  3718,
+    3722,  3727,  3731,  3737,  3742,  3746,  3752,  3753,  3757,  3761,
+    3762,  3763,  3764,  3765,  3770,  3769,  3781,  3785,  3780,  3790,
+    3790,  3794,  3798,  3802,  3806,  3810,  3814,  3818,  3822,  3826,
+    3830,  3834,  3835,  3841,  3848,  3840,  3861,  3869,  3877,  3877,
+    3877,  3884,  3884,  3884,  3891,  3897,  3902,  3904,  3901,  3913,
+    3911,  3929,  3934,  3927,  3951,  3949,  3965,  3975,  3986,  3990,
+    3994,  3998,  4004,  4011,  4012,  4013,  4016,  4017,  4020,  4021,
+    4029,  4030,  4036,  4040,  4043,  4047,  4051,  4055,  4060,  4064,
+    4068,  4072,  4078,  4077,  4087,  4091,  4095,  4099,  4105,  4110,
+    4115,  4119,  4123,  4127,  4131,  4135,  4139,  4143,  4147,  4151,
+    4155,  4159,  4163,  4167,  4171,  4177,  4182,  4189,  4189,  4193,
+    4198,  4205,  4209,  4215,  4216,  4219,  4224,  4227,  4231,  4237,
+    4241,  4248,  4247,  4264,  4269,  4273,  4278,  4285,  4289,  4293,
+    4297,  4301,  4305,  4309,  4313,  4317,  4324,  4323,  4338,  4337,
+    4353,  4361,  4370,  4373,  4380,  4383,  4387,  4388,  4391,  4395,
+    4398,  4402,  4405,  4406,  4407,  4408,  4411,  4412,  4418,  4423,
+    4428,  4433,  4439,  4440,  4446,  4452,  4451,  4463,  4467,  4473,
+    4477,  4483,  4492,  4503,  4506,  4507,  4510,  4516,  4522,  4523,
+    4526,  4533,  4532,  4547,  4551,  4560,  4564,  4576,  4583,  4590,
+    4591,  4592,  4593,  4594,  4598,  4604,  4608,  4616,  4617,  4618,
+    4622,  4628,  4632,  4636,  4640,  4644,  4650,  4654,  4660,  4664,
+    4668,  4672,  4676,  4680,  4684,  4692,  4699,  4705,  4706,  4710,
+    4714,  4713,  4730,  4731,  4734,  4740,  4744,  4750,  4751,  4755,
+    4759,  4765,  4769,  4775,  4781,  4788,  4794,  4801,  4805,  4811,
+    4815,  4821,  4822,  4825,  4829,  4835,  4839,  4843,  4847,  4853,
+    4858,  4863,  4867,  4871,  4875,  4879,  4883,  4887,  4891,  4895,
+    4899,  4903,  4907,  4911,  4915,  4920,  4926,  4931,  4936,  4941,
+    4946,  4953,  4957,  4964,  4969,  4968,  4980,  4984,  4990,  4998,
+    5006,  5014,  5018,  5024,  5028,  5034,  5035,  5038,  5043,  5050,
+    5051,  5054,  5058,  5064,  5068,  5074,  5080,  5080,  5087,  5088,
+    5094,  5098,  5104,  5110,  5115,  5119,  5124,  5129,  5145,  5150,
+    5156,  5157,  5158,  5161,  5162,  5163,  5164,  5167,  5168,  5169,
+    5172,  5173,  5176,  5180,  5186,  5187,  5193,  5194,  5197,  5198,
+    5201,  5204,  5205,  5206,  5209,  5210,  5213,  5218,  5221,  5222,
+    5226
 };
 #endif
 
@@ -7566,7 +7563,7 @@ YYLTYPE yylloc = yyloc_default;
 
 
 
-#line 7570 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7567 "mrbgems/mruby-compiler/core/y.tab.c"
 
   yylsp[0] = yylloc;
   goto yysetstate;
@@ -7779,84 +7776,84 @@ yyreduce:
   switch (yyn)
     {
   case 2: /* $@1: %empty  */
-#line 2707 "mrbgems/mruby-compiler/core/parse.y"
+#line 2704 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       p->lstate = EXPR_BEG;
                       if (!p->locals) p->locals = cons(0,0);
                     }
-#line 7788 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7785 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 3: /* program: $@1 top_compstmt  */
-#line 2712 "mrbgems/mruby-compiler/core/parse.y"
+#line 2709 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       p->tree = new_scope(p, (yyvsp[0].nd));
                     }
-#line 7796 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7793 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 4: /* top_compstmt: top_stmts opt_terms  */
-#line 2718 "mrbgems/mruby-compiler/core/parse.y"
+#line 2715 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-1].nd);
                     }
-#line 7804 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7801 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 5: /* top_stmts: none  */
-#line 2724 "mrbgems/mruby-compiler/core/parse.y"
+#line 2721 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_stmts(p, 0);
                     }
-#line 7812 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7809 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 6: /* top_stmts: top_stmt  */
-#line 2728 "mrbgems/mruby-compiler/core/parse.y"
+#line 2725 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_stmts(p, (yyvsp[0].nd));
                     }
-#line 7820 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7817 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 7: /* top_stmts: top_stmts terms top_stmt  */
-#line 2732 "mrbgems/mruby-compiler/core/parse.y"
+#line 2729 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push((yyvsp[-2].nd), newline_node((yyvsp[0].nd)));
                     }
-#line 7828 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7825 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 8: /* top_stmts: error top_stmt  */
-#line 2736 "mrbgems/mruby-compiler/core/parse.y"
+#line 2733 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_stmts(p, 0);
                     }
-#line 7836 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7833 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 10: /* @2: %empty  */
-#line 2743 "mrbgems/mruby-compiler/core/parse.y"
+#line 2740 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = local_switch(p);
                       nvars_block(p);
                     }
-#line 7845 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7842 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 11: /* top_stmt: "'BEGIN'" @2 '{' top_compstmt '}'  */
-#line 2748 "mrbgems/mruby-compiler/core/parse.y"
+#line 2745 "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 7856 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7853 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 12: /* bodystmt: compstmt opt_rescue opt_else opt_ensure  */
-#line 2760 "mrbgems/mruby-compiler/core/parse.y"
+#line 2757 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       if ((yyvsp[-2].nd)) {
                         (yyval.nd) = new_rescue(p, (yyvsp[-3].nd), (yyvsp[-2].nd), (yyvsp[-1].nd));
@@ -7877,89 +7874,89 @@ yyreduce:
                         }
                       }
                     }
-#line 7881 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7878 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 13: /* compstmt: stmts opt_terms  */
-#line 2783 "mrbgems/mruby-compiler/core/parse.y"
+#line 2780 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-1].nd);
                     }
-#line 7889 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7886 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 14: /* stmts: none  */
-#line 2789 "mrbgems/mruby-compiler/core/parse.y"
+#line 2786 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_stmts(p, 0);
                     }
-#line 7897 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7894 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 15: /* stmts: stmt  */
-#line 2793 "mrbgems/mruby-compiler/core/parse.y"
+#line 2790 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_stmts(p, (yyvsp[0].nd));
                     }
-#line 7905 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7902 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 16: /* stmts: stmts terms stmt  */
-#line 2797 "mrbgems/mruby-compiler/core/parse.y"
+#line 2794 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push((yyvsp[-2].nd), newline_node((yyvsp[0].nd)));
                     }
-#line 7913 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7910 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 17: /* stmts: error stmt  */
-#line 2801 "mrbgems/mruby-compiler/core/parse.y"
+#line 2798 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_stmts(p, (yyvsp[0].nd));
                     }
-#line 7921 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7918 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 18: /* $@3: %empty  */
-#line 2806 "mrbgems/mruby-compiler/core/parse.y"
+#line 2803 "mrbgems/mruby-compiler/core/parse.y"
                                      {p->lstate = EXPR_FNAME;}
-#line 7927 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7924 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 19: /* stmt: "'alias'" fsym $@3 fsym  */
-#line 2807 "mrbgems/mruby-compiler/core/parse.y"
+#line 2804 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_alias(p, (yyvsp[-2].id), (yyvsp[0].id));
                     }
-#line 7935 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7932 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 20: /* stmt: "'undef'" undef_list  */
-#line 2811 "mrbgems/mruby-compiler/core/parse.y"
+#line 2808 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_undef(p, (yyvsp[0].nd));
                     }
-#line 7943 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7940 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 21: /* stmt: stmt "'if' modifier" expr_value  */
-#line 2815 "mrbgems/mruby-compiler/core/parse.y"
+#line 2812 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_if(p, cond((yyvsp[0].nd)), (yyvsp[-2].nd), 0);
                     }
-#line 7951 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7948 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 22: /* stmt: stmt "'unless' modifier" expr_value  */
-#line 2819 "mrbgems/mruby-compiler/core/parse.y"
+#line 2816 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_unless(p, cond((yyvsp[0].nd)), (yyvsp[-2].nd), 0);
                     }
-#line 7959 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7956 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 23: /* stmt: stmt "'while' modifier" expr_value  */
-#line 2823 "mrbgems/mruby-compiler/core/parse.y"
+#line 2820 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       if ((yyvsp[-2].nd) && node_to_type((yyvsp[-2].nd)->car) == NODE_BEGIN) {
                         (yyval.nd) = new_while_mod(p, cond((yyvsp[0].nd)), (yyvsp[-2].nd));
@@ -7968,11 +7965,11 @@ yyreduce:
                         (yyval.nd) = new_while(p, cond((yyvsp[0].nd)), (yyvsp[-2].nd));
                       }
                     }
-#line 7972 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7969 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 24: /* stmt: stmt "'until' modifier" expr_value  */
-#line 2832 "mrbgems/mruby-compiler/core/parse.y"
+#line 2829 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       if ((yyvsp[-2].nd) && node_to_type((yyvsp[-2].nd)->car) == NODE_BEGIN) {
                         (yyval.nd) = new_until_mod(p, cond((yyvsp[0].nd)), (yyvsp[-2].nd));
@@ -7981,127 +7978,127 @@ yyreduce:
                         (yyval.nd) = new_until(p, cond((yyvsp[0].nd)), (yyvsp[-2].nd));
                       }
                     }
-#line 7985 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7982 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 25: /* stmt: stmt "'rescue' modifier" stmt  */
-#line 2841 "mrbgems/mruby-compiler/core/parse.y"
+#line 2838 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_mod_rescue(p, (yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 7993 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7990 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 26: /* stmt: "'END'" '{' compstmt '}'  */
-#line 2845 "mrbgems/mruby-compiler/core/parse.y"
+#line 2842 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       yyerror(&(yylsp[-3]), p, "END not supported");
                       (yyval.nd) = new_postexe(p, (yyvsp[-1].nd));
                     }
-#line 8002 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7999 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 28: /* stmt: mlhs '=' command_call  */
-#line 2851 "mrbgems/mruby-compiler/core/parse.y"
+#line 2848 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_masgn(p, (yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 8010 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8007 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 29: /* stmt: lhs '=' mrhs  */
-#line 2855 "mrbgems/mruby-compiler/core/parse.y"
+#line 2852 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_asgn(p, (yyvsp[-2].nd), new_array(p, (yyvsp[0].nd)));
                     }
-#line 8018 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8015 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 30: /* stmt: mlhs '=' arg  */
-#line 2859 "mrbgems/mruby-compiler/core/parse.y"
+#line 2856 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_masgn(p, (yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 8026 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8023 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 31: /* stmt: mlhs '=' mrhs  */
-#line 2863 "mrbgems/mruby-compiler/core/parse.y"
+#line 2860 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_masgn(p, (yyvsp[-2].nd), new_array(p, (yyvsp[0].nd)));
                     }
-#line 8034 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8031 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 32: /* stmt: arg "=>" "local variable or method"  */
-#line 2867 "mrbgems/mruby-compiler/core/parse.y"
+#line 2864 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       node *lhs = new_lvar(p, (yyvsp[0].id));
                       assignable(p, lhs);
                       (yyval.nd) = new_asgn(p, lhs, (yyvsp[-2].nd));
                     }
-#line 8044 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8041 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 34: /* command_asgn: lhs '=' command_rhs  */
-#line 2876 "mrbgems/mruby-compiler/core/parse.y"
+#line 2873 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_asgn(p, (yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 8052 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8049 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 35: /* command_asgn: var_lhs tOP_ASGN command_rhs  */
-#line 2880 "mrbgems/mruby-compiler/core/parse.y"
+#line 2877 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_op_asgn(p, (yyvsp[-2].nd), (yyvsp[-1].id), (yyvsp[0].nd));
                     }
-#line 8060 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8057 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 36: /* command_asgn: primary_value '[' opt_call_args ']' tOP_ASGN command_rhs  */
-#line 2884 "mrbgems/mruby-compiler/core/parse.y"
+#line 2881 "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 8068 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8065 "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 2888 "mrbgems/mruby-compiler/core/parse.y"
+#line 2885 "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 8076 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8073 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 38: /* command_asgn: primary_value call_op "constant" tOP_ASGN command_rhs  */
-#line 2892 "mrbgems/mruby-compiler/core/parse.y"
+#line 2889 "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 8084 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8081 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 39: /* command_asgn: primary_value "::" "constant" tOP_ASGN command_call  */
-#line 2896 "mrbgems/mruby-compiler/core/parse.y"
+#line 2893 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       yyerror(&(yylsp[-4]), p, "constant re-assignment");
                       (yyval.nd) = 0;
                     }
-#line 8093 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8090 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 40: /* command_asgn: primary_value "::" "local variable or method" tOP_ASGN command_rhs  */
-#line 2901 "mrbgems/mruby-compiler/core/parse.y"
+#line 2898 "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 8101 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8098 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 41: /* command_asgn: defn_head f_opt_arglist_paren '=' command  */
-#line 2905 "mrbgems/mruby-compiler/core/parse.y"
+#line 2902 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-3].nd);
                       endless_method_name(p, (yyvsp[-3].nd));
@@ -8110,11 +8107,11 @@ yyreduce:
                       nvars_unnest(p);
                       p->in_def--;
                     }
-#line 8114 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8111 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 42: /* command_asgn: defn_head f_opt_arglist_paren '=' command "'rescue' modifier" arg  */
-#line 2914 "mrbgems/mruby-compiler/core/parse.y"
+#line 2911 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-5].nd);
                       endless_method_name(p, (yyvsp[-5].nd));
@@ -8123,11 +8120,11 @@ yyreduce:
                       nvars_unnest(p);
                       p->in_def--;
                     }
-#line 8127 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8124 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 43: /* command_asgn: defs_head f_opt_arglist_paren '=' command  */
-#line 2923 "mrbgems/mruby-compiler/core/parse.y"
+#line 2920 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-3].nd);
                       void_expr_error(p, (yyvsp[0].nd));
@@ -8136,11 +8133,11 @@ yyreduce:
                       p->in_def--;
                       p->in_single--;
                     }
-#line 8140 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8137 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 44: /* command_asgn: defs_head f_opt_arglist_paren '=' command "'rescue' modifier" arg  */
-#line 2932 "mrbgems/mruby-compiler/core/parse.y"
+#line 2929 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-5].nd);
                       void_expr_error(p, (yyvsp[-2].nd));
@@ -8149,79 +8146,79 @@ yyreduce:
                       p->in_def--;
                       p->in_single--;
                     }
-#line 8153 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8150 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 45: /* command_asgn: backref tOP_ASGN command_rhs  */
-#line 2941 "mrbgems/mruby-compiler/core/parse.y"
+#line 2938 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       backref_error(p, (yyvsp[-2].nd));
                       (yyval.nd) = new_stmts(p, 0);
                     }
-#line 8162 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8159 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 47: /* command_rhs: command_call "'rescue' modifier" stmt  */
-#line 2949 "mrbgems/mruby-compiler/core/parse.y"
+#line 2946 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_mod_rescue(p, (yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 8170 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8167 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 50: /* expr: expr "'and'" expr  */
-#line 2958 "mrbgems/mruby-compiler/core/parse.y"
+#line 2955 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_and(p, (yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 8178 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8175 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 51: /* expr: expr "'or'" expr  */
-#line 2962 "mrbgems/mruby-compiler/core/parse.y"
+#line 2959 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_or(p, (yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 8186 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8183 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 52: /* expr: "'not'" opt_nl expr  */
-#line 2966 "mrbgems/mruby-compiler/core/parse.y"
+#line 2963 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_uni_op(p, cond((yyvsp[0].nd)), "!");
                     }
-#line 8194 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8191 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 53: /* expr: '!' command_call  */
-#line 2970 "mrbgems/mruby-compiler/core/parse.y"
+#line 2967 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_uni_op(p, cond((yyvsp[0].nd)), "!");
                     }
-#line 8202 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8199 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 55: /* defn_head: "'def'" fname  */
-#line 2978 "mrbgems/mruby-compiler/core/parse.y"
+#line 2975 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_def(p, (yyvsp[0].id), int_to_node(p->cmdarg_stack), local_switch(p));
                       p->cmdarg_stack = 0;
                       p->in_def++;
                       nvars_block(p);
                     }
-#line 8213 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8210 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 56: /* $@4: %empty  */
-#line 2987 "mrbgems/mruby-compiler/core/parse.y"
+#line 2984 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       p->lstate = EXPR_FNAME;
                     }
-#line 8221 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8218 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 57: /* defs_head: "'def'" singleton dot_or_colon $@4 fname  */
-#line 2991 "mrbgems/mruby-compiler/core/parse.y"
+#line 2988 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_sdef(p, (yyvsp[-3].nd), (yyvsp[0].id), int_to_node(p->cmdarg_stack), local_switch(p));
                       p->cmdarg_stack = 0;
@@ -8230,1054 +8227,1054 @@ yyreduce:
                       nvars_block(p);
                       p->lstate = EXPR_ENDFN; /* force for args */
                     }
-#line 8234 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8231 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 58: /* expr_value: expr  */
-#line 3002 "mrbgems/mruby-compiler/core/parse.y"
+#line 2999 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       if (!(yyvsp[0].nd)) (yyval.nd) = new_nil(p);
                       else {
                         (yyval.nd) = (yyvsp[0].nd);
                       }
                     }
-#line 8245 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8242 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 62: /* block_command: block_call call_op2 operation2 command_args  */
-#line 3016 "mrbgems/mruby-compiler/core/parse.y"
+#line 3013 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-3].nd), (yyvsp[-1].id), (yyvsp[0].nd), (yyvsp[-2].num));
                     }
-#line 8253 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8250 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 63: /* $@5: %empty  */
-#line 3022 "mrbgems/mruby-compiler/core/parse.y"
+#line 3019 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       local_nest(p);
                       nvars_nest(p);
                     }
-#line 8262 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8259 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 64: /* cmd_brace_block: "{" $@5 opt_block_param compstmt '}'  */
-#line 3029 "mrbgems/mruby-compiler/core/parse.y"
+#line 3026 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_block(p, (yyvsp[-2].nd), (yyvsp[-1].nd));
                       local_unnest(p);
                       nvars_unnest(p);
                     }
-#line 8272 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8269 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 65: /* command: operation command_args  */
-#line 3037 "mrbgems/mruby-compiler/core/parse.y"
+#line 3034 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_fcall(p, (yyvsp[-1].id), (yyvsp[0].nd));
                     }
-#line 8280 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8277 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 66: /* command: operation command_args cmd_brace_block  */
-#line 3041 "mrbgems/mruby-compiler/core/parse.y"
+#line 3038 "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 8289 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8286 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 67: /* command: primary_value call_op operation2 command_args  */
-#line 3046 "mrbgems/mruby-compiler/core/parse.y"
+#line 3043 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-3].nd), (yyvsp[-1].id), (yyvsp[0].nd), (yyvsp[-2].num));
                     }
-#line 8297 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8294 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 68: /* command: primary_value call_op operation2 command_args cmd_brace_block  */
-#line 3050 "mrbgems/mruby-compiler/core/parse.y"
+#line 3047 "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 8306 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8303 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 69: /* command: primary_value "::" operation2 command_args  */
-#line 3055 "mrbgems/mruby-compiler/core/parse.y"
+#line 3052 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-3].nd), (yyvsp[-1].id), (yyvsp[0].nd), tCOLON2);
                     }
-#line 8314 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8311 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 70: /* command: primary_value "::" operation2 command_args cmd_brace_block  */
-#line 3059 "mrbgems/mruby-compiler/core/parse.y"
+#line 3056 "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 8323 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8320 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 71: /* command: "'super'" command_args  */
-#line 3064 "mrbgems/mruby-compiler/core/parse.y"
+#line 3061 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_super(p, (yyvsp[0].nd));
                     }
-#line 8331 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8328 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 72: /* command: "'yield'" command_args  */
-#line 3068 "mrbgems/mruby-compiler/core/parse.y"
+#line 3065 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_yield(p, (yyvsp[0].nd));
                     }
-#line 8339 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8336 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 73: /* command: "'return'" call_args  */
-#line 3072 "mrbgems/mruby-compiler/core/parse.y"
+#line 3069 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_return(p, ret_args(p, (yyvsp[0].nd)));
                     }
-#line 8347 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8344 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 74: /* command: "'break'" call_args  */
-#line 3076 "mrbgems/mruby-compiler/core/parse.y"
+#line 3073 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_break(p, ret_args(p, (yyvsp[0].nd)));
                     }
-#line 8355 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8352 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 75: /* command: "'next'" call_args  */
-#line 3080 "mrbgems/mruby-compiler/core/parse.y"
+#line 3077 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_next(p, ret_args(p, (yyvsp[0].nd)));
                     }
-#line 8363 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8360 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 76: /* mlhs: mlhs_basic  */
-#line 3086 "mrbgems/mruby-compiler/core/parse.y"
+#line 3083 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[0].nd);
                     }
-#line 8371 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8368 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 77: /* mlhs: tLPAREN mlhs_inner rparen  */
-#line 3090 "mrbgems/mruby-compiler/core/parse.y"
+#line 3087 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-1].nd);
                     }
-#line 8379 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8376 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 79: /* mlhs_inner: tLPAREN mlhs_inner rparen  */
-#line 3097 "mrbgems/mruby-compiler/core/parse.y"
+#line 3094 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-1].nd);
                     }
-#line 8387 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8384 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 80: /* mlhs_basic: mlhs_list  */
-#line 3103 "mrbgems/mruby-compiler/core/parse.y"
+#line 3100 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1((yyvsp[0].nd));
                     }
-#line 8395 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8392 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 81: /* mlhs_basic: mlhs_list mlhs_item  */
-#line 3107 "mrbgems/mruby-compiler/core/parse.y"
+#line 3104 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1(push((yyvsp[-1].nd),(yyvsp[0].nd)));
                     }
-#line 8403 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8400 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 82: /* mlhs_basic: mlhs_list "*" mlhs_node  */
-#line 3111 "mrbgems/mruby-compiler/core/parse.y"
+#line 3108 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list2((yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 8411 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8408 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 83: /* mlhs_basic: mlhs_list "*" mlhs_node ',' mlhs_post  */
-#line 3115 "mrbgems/mruby-compiler/core/parse.y"
+#line 3112 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list3((yyvsp[-4].nd), (yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 8419 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8416 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 84: /* mlhs_basic: mlhs_list "*"  */
-#line 3119 "mrbgems/mruby-compiler/core/parse.y"
+#line 3116 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list2((yyvsp[-1].nd), new_nil(p));
                     }
-#line 8427 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8424 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 85: /* mlhs_basic: mlhs_list "*" ',' mlhs_post  */
-#line 3123 "mrbgems/mruby-compiler/core/parse.y"
+#line 3120 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list3((yyvsp[-3].nd), new_nil(p), (yyvsp[0].nd));
                     }
-#line 8435 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8432 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 86: /* mlhs_basic: "*" mlhs_node  */
-#line 3127 "mrbgems/mruby-compiler/core/parse.y"
+#line 3124 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list2(0, (yyvsp[0].nd));
                     }
-#line 8443 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8440 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 87: /* mlhs_basic: "*" mlhs_node ',' mlhs_post  */
-#line 3131 "mrbgems/mruby-compiler/core/parse.y"
+#line 3128 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list3(0, (yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 8451 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8448 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 88: /* mlhs_basic: "*"  */
-#line 3135 "mrbgems/mruby-compiler/core/parse.y"
+#line 3132 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list2(0, new_nil(p));
                     }
-#line 8459 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8456 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 89: /* mlhs_basic: "*" ',' mlhs_post  */
-#line 3139 "mrbgems/mruby-compiler/core/parse.y"
+#line 3136 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list3(0, new_nil(p), (yyvsp[0].nd));
                     }
-#line 8467 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8464 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 91: /* mlhs_item: tLPAREN mlhs_inner rparen  */
-#line 3146 "mrbgems/mruby-compiler/core/parse.y"
+#line 3143 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_masgn(p, (yyvsp[-1].nd), NULL);
                     }
-#line 8475 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8472 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 92: /* mlhs_list: mlhs_item ','  */
-#line 3152 "mrbgems/mruby-compiler/core/parse.y"
+#line 3149 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1((yyvsp[-1].nd));
                     }
-#line 8483 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8480 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 93: /* mlhs_list: mlhs_list mlhs_item ','  */
-#line 3156 "mrbgems/mruby-compiler/core/parse.y"
+#line 3153 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push((yyvsp[-2].nd), (yyvsp[-1].nd));
                     }
-#line 8491 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8488 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 94: /* mlhs_post: mlhs_item  */
-#line 3162 "mrbgems/mruby-compiler/core/parse.y"
+#line 3159 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1((yyvsp[0].nd));
                     }
-#line 8499 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8496 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 95: /* mlhs_post: mlhs_list mlhs_item  */
-#line 3166 "mrbgems/mruby-compiler/core/parse.y"
+#line 3163 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push((yyvsp[-1].nd), (yyvsp[0].nd));
                     }
-#line 8507 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8504 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 96: /* mlhs_node: variable  */
-#line 3172 "mrbgems/mruby-compiler/core/parse.y"
+#line 3169 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       assignable(p, (yyvsp[0].nd));
                     }
-#line 8515 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8512 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 97: /* mlhs_node: primary_value '[' opt_call_args ']'  */
-#line 3176 "mrbgems/mruby-compiler/core/parse.y"
+#line 3173 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-3].nd), intern_op(aref), (yyvsp[-1].nd), '.');
                     }
-#line 8523 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8520 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 98: /* mlhs_node: primary_value call_op "local variable or method"  */
-#line 3180 "mrbgems/mruby-compiler/core/parse.y"
+#line 3177 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-2].nd), (yyvsp[0].id), 0, (yyvsp[-1].num));
                     }
-#line 8531 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8528 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 99: /* mlhs_node: primary_value "::" "local variable or method"  */
-#line 3184 "mrbgems/mruby-compiler/core/parse.y"
+#line 3181 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-2].nd), (yyvsp[0].id), 0, tCOLON2);
                     }
-#line 8539 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8536 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 100: /* mlhs_node: primary_value call_op "constant"  */
-#line 3188 "mrbgems/mruby-compiler/core/parse.y"
+#line 3185 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-2].nd), (yyvsp[0].id), 0, (yyvsp[-1].num));
                     }
-#line 8547 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8544 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 101: /* mlhs_node: primary_value "::" "constant"  */
-#line 3192 "mrbgems/mruby-compiler/core/parse.y"
+#line 3189 "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 8557 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8554 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 102: /* mlhs_node: tCOLON3 "constant"  */
-#line 3198 "mrbgems/mruby-compiler/core/parse.y"
+#line 3195 "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 8567 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8564 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 103: /* mlhs_node: backref  */
-#line 3204 "mrbgems/mruby-compiler/core/parse.y"
+#line 3201 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       backref_error(p, (yyvsp[0].nd));
                       (yyval.nd) = 0;
                     }
-#line 8576 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8573 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 104: /* lhs: variable  */
-#line 3211 "mrbgems/mruby-compiler/core/parse.y"
+#line 3208 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       assignable(p, (yyvsp[0].nd));
                     }
-#line 8584 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8581 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 105: /* lhs: primary_value '[' opt_call_args ']'  */
-#line 3215 "mrbgems/mruby-compiler/core/parse.y"
+#line 3212 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-3].nd), intern_op(aref), (yyvsp[-1].nd), '.');
                     }
-#line 8592 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8589 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 106: /* lhs: primary_value call_op "local variable or method"  */
-#line 3219 "mrbgems/mruby-compiler/core/parse.y"
+#line 3216 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-2].nd), (yyvsp[0].id), 0, (yyvsp[-1].num));
                     }
-#line 8600 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8597 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 107: /* lhs: primary_value "::" "local variable or method"  */
-#line 3223 "mrbgems/mruby-compiler/core/parse.y"
+#line 3220 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-2].nd), (yyvsp[0].id), 0, tCOLON2);
                     }
-#line 8608 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8605 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 108: /* lhs: primary_value call_op "constant"  */
-#line 3227 "mrbgems/mruby-compiler/core/parse.y"
+#line 3224 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-2].nd), (yyvsp[0].id), 0, (yyvsp[-1].num));
                     }
-#line 8616 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8613 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 109: /* lhs: primary_value "::" "constant"  */
-#line 3231 "mrbgems/mruby-compiler/core/parse.y"
+#line 3228 "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 8626 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8623 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 110: /* lhs: tCOLON3 "constant"  */
-#line 3237 "mrbgems/mruby-compiler/core/parse.y"
+#line 3234 "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 8636 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8633 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 111: /* lhs: backref  */
-#line 3243 "mrbgems/mruby-compiler/core/parse.y"
+#line 3240 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       backref_error(p, (yyvsp[0].nd));
                       (yyval.nd) = 0;
                     }
-#line 8645 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8642 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 112: /* lhs: "numbered parameter"  */
-#line 3248 "mrbgems/mruby-compiler/core/parse.y"
+#line 3245 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       yyerror(&(yylsp[0]), p, "can't assign to numbered parameter");
                     }
-#line 8653 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8650 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 113: /* cname: "local variable or method"  */
-#line 3254 "mrbgems/mruby-compiler/core/parse.y"
+#line 3251 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       yyerror(&(yylsp[0]), p, "class/module name must be CONSTANT");
                     }
-#line 8661 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8658 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 115: /* cpath: tCOLON3 cname  */
-#line 3261 "mrbgems/mruby-compiler/core/parse.y"
+#line 3258 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = cons(int_to_node(1), sym_to_node((yyvsp[0].id)));
                     }
-#line 8669 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8666 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 116: /* cpath: cname  */
-#line 3265 "mrbgems/mruby-compiler/core/parse.y"
+#line 3262 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = cons(int_to_node(0), sym_to_node((yyvsp[0].id)));
                     }
-#line 8677 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8674 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 117: /* cpath: primary_value "::" cname  */
-#line 3269 "mrbgems/mruby-compiler/core/parse.y"
+#line 3266 "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 8686 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8683 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 121: /* fname: op  */
-#line 3279 "mrbgems/mruby-compiler/core/parse.y"
+#line 3276 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       p->lstate = EXPR_ENDFN;
                       (yyval.id) = (yyvsp[0].id);
                     }
-#line 8695 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8692 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 122: /* fname: reswords  */
-#line 3284 "mrbgems/mruby-compiler/core/parse.y"
+#line 3281 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       p->lstate = EXPR_ENDFN;
                       (yyval.id) = (yyvsp[0].id);
                     }
-#line 8704 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8701 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 125: /* undef_list: fsym  */
-#line 3295 "mrbgems/mruby-compiler/core/parse.y"
+#line 3292 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = cons(sym_to_node((yyvsp[0].id)), 0);
                     }
-#line 8712 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8709 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 126: /* $@6: %empty  */
-#line 3298 "mrbgems/mruby-compiler/core/parse.y"
+#line 3295 "mrbgems/mruby-compiler/core/parse.y"
                                  {p->lstate = EXPR_FNAME;}
-#line 8718 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8715 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 127: /* undef_list: undef_list ',' $@6 fsym  */
-#line 3299 "mrbgems/mruby-compiler/core/parse.y"
+#line 3296 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push((yyvsp[-3].nd), sym_to_node((yyvsp[0].id)));
                     }
-#line 8726 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8723 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 128: /* op: '|'  */
-#line 3304 "mrbgems/mruby-compiler/core/parse.y"
+#line 3301 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(or);     }
-#line 8732 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8729 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 129: /* op: '^'  */
-#line 3305 "mrbgems/mruby-compiler/core/parse.y"
+#line 3302 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(xor);    }
-#line 8738 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8735 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 130: /* op: '&'  */
-#line 3306 "mrbgems/mruby-compiler/core/parse.y"
+#line 3303 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(and);    }
-#line 8744 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8741 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 131: /* op: "<=>"  */
-#line 3307 "mrbgems/mruby-compiler/core/parse.y"
+#line 3304 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(cmp);    }
-#line 8750 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8747 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 132: /* op: "=="  */
-#line 3308 "mrbgems/mruby-compiler/core/parse.y"
+#line 3305 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(eq);     }
-#line 8756 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8753 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 133: /* op: "==="  */
-#line 3309 "mrbgems/mruby-compiler/core/parse.y"
+#line 3306 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(eqq);    }
-#line 8762 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8759 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 134: /* op: "=~"  */
-#line 3310 "mrbgems/mruby-compiler/core/parse.y"
+#line 3307 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(match);  }
-#line 8768 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8765 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 135: /* op: "!~"  */
-#line 3311 "mrbgems/mruby-compiler/core/parse.y"
+#line 3308 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(nmatch); }
-#line 8774 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8771 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 136: /* op: '>'  */
-#line 3312 "mrbgems/mruby-compiler/core/parse.y"
+#line 3309 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(gt);     }
-#line 8780 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8777 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 137: /* op: ">="  */
-#line 3313 "mrbgems/mruby-compiler/core/parse.y"
+#line 3310 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(ge);     }
-#line 8786 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8783 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 138: /* op: '<'  */
-#line 3314 "mrbgems/mruby-compiler/core/parse.y"
+#line 3311 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(lt);     }
-#line 8792 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8789 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 139: /* op: "<="  */
-#line 3315 "mrbgems/mruby-compiler/core/parse.y"
+#line 3312 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(le);     }
-#line 8798 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8795 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 140: /* op: "!="  */
-#line 3316 "mrbgems/mruby-compiler/core/parse.y"
+#line 3313 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(neq);    }
-#line 8804 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8801 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 141: /* op: "<<"  */
-#line 3317 "mrbgems/mruby-compiler/core/parse.y"
+#line 3314 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(lshift); }
-#line 8810 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8807 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 142: /* op: ">>"  */
-#line 3318 "mrbgems/mruby-compiler/core/parse.y"
+#line 3315 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(rshift); }
-#line 8816 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8813 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 143: /* op: '+'  */
-#line 3319 "mrbgems/mruby-compiler/core/parse.y"
+#line 3316 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(add);    }
-#line 8822 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8819 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 144: /* op: '-'  */
-#line 3320 "mrbgems/mruby-compiler/core/parse.y"
+#line 3317 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(sub);    }
-#line 8828 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8825 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 145: /* op: '*'  */
-#line 3321 "mrbgems/mruby-compiler/core/parse.y"
+#line 3318 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(mul);    }
-#line 8834 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8831 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 146: /* op: "*"  */
-#line 3322 "mrbgems/mruby-compiler/core/parse.y"
+#line 3319 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(mul);    }
-#line 8840 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8837 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 147: /* op: '/'  */
-#line 3323 "mrbgems/mruby-compiler/core/parse.y"
+#line 3320 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(div);    }
-#line 8846 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8843 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 148: /* op: '%'  */
-#line 3324 "mrbgems/mruby-compiler/core/parse.y"
+#line 3321 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(mod);    }
-#line 8852 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8849 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 149: /* op: tPOW  */
-#line 3325 "mrbgems/mruby-compiler/core/parse.y"
+#line 3322 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(pow);    }
-#line 8858 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8855 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 150: /* op: "**"  */
-#line 3326 "mrbgems/mruby-compiler/core/parse.y"
+#line 3323 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(pow);    }
-#line 8864 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8861 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 151: /* op: '!'  */
-#line 3327 "mrbgems/mruby-compiler/core/parse.y"
+#line 3324 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(not);    }
-#line 8870 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8867 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 152: /* op: '~'  */
-#line 3328 "mrbgems/mruby-compiler/core/parse.y"
+#line 3325 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(neg);    }
-#line 8876 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8873 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 153: /* op: "unary plus"  */
-#line 3329 "mrbgems/mruby-compiler/core/parse.y"
+#line 3326 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(plus);   }
-#line 8882 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8879 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 154: /* op: "unary minus"  */
-#line 3330 "mrbgems/mruby-compiler/core/parse.y"
+#line 3327 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(minus);  }
-#line 8888 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8885 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 155: /* op: tAREF  */
-#line 3331 "mrbgems/mruby-compiler/core/parse.y"
+#line 3328 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(aref);   }
-#line 8894 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8891 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 156: /* op: tASET  */
-#line 3332 "mrbgems/mruby-compiler/core/parse.y"
+#line 3329 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(aset);   }
-#line 8900 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8897 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 157: /* op: '`'  */
-#line 3333 "mrbgems/mruby-compiler/core/parse.y"
+#line 3330 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(tick);   }
-#line 8906 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8903 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 198: /* arg: lhs '=' arg_rhs  */
-#line 3351 "mrbgems/mruby-compiler/core/parse.y"
+#line 3348 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_asgn(p, (yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 8914 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8911 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 199: /* arg: var_lhs tOP_ASGN arg_rhs  */
-#line 3355 "mrbgems/mruby-compiler/core/parse.y"
+#line 3352 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_op_asgn(p, (yyvsp[-2].nd), (yyvsp[-1].id), (yyvsp[0].nd));
                     }
-#line 8922 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8919 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 200: /* arg: primary_value '[' opt_call_args ']' tOP_ASGN arg_rhs  */
-#line 3359 "mrbgems/mruby-compiler/core/parse.y"
+#line 3356 "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 8930 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8927 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 201: /* arg: primary_value call_op "local variable or method" tOP_ASGN arg_rhs  */
-#line 3363 "mrbgems/mruby-compiler/core/parse.y"
+#line 3360 "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 8938 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8935 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 202: /* arg: primary_value call_op "constant" tOP_ASGN arg_rhs  */
-#line 3367 "mrbgems/mruby-compiler/core/parse.y"
+#line 3364 "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 8946 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8943 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 203: /* arg: primary_value "::" "local variable or method" tOP_ASGN arg_rhs  */
-#line 3371 "mrbgems/mruby-compiler/core/parse.y"
+#line 3368 "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 8954 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8951 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 204: /* arg: primary_value "::" "constant" tOP_ASGN arg_rhs  */
-#line 3375 "mrbgems/mruby-compiler/core/parse.y"
+#line 3372 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       yyerror(&(yylsp[-4]), p, "constant re-assignment");
                       (yyval.nd) = new_stmts(p, 0);
                     }
-#line 8963 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8960 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 205: /* arg: tCOLON3 "constant" tOP_ASGN arg_rhs  */
-#line 3380 "mrbgems/mruby-compiler/core/parse.y"
+#line 3377 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       yyerror(&(yylsp[-3]), p, "constant re-assignment");
                       (yyval.nd) = new_stmts(p, 0);
                     }
-#line 8972 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8969 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 206: /* arg: backref tOP_ASGN arg_rhs  */
-#line 3385 "mrbgems/mruby-compiler/core/parse.y"
+#line 3382 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       backref_error(p, (yyvsp[-2].nd));
                       (yyval.nd) = new_stmts(p, 0);
                     }
-#line 8981 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8978 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 207: /* arg: arg ".." arg  */
-#line 3390 "mrbgems/mruby-compiler/core/parse.y"
+#line 3387 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_dot2(p, (yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 8989 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8986 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 208: /* arg: arg ".."  */
-#line 3394 "mrbgems/mruby-compiler/core/parse.y"
+#line 3391 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_dot2(p, (yyvsp[-1].nd), new_nil(p));
                     }
-#line 8997 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8994 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 209: /* arg: tBDOT2 arg  */
-#line 3398 "mrbgems/mruby-compiler/core/parse.y"
+#line 3395 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_dot2(p, new_nil(p), (yyvsp[0].nd));
                     }
-#line 9005 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9002 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 210: /* arg: arg "..." arg  */
-#line 3402 "mrbgems/mruby-compiler/core/parse.y"
+#line 3399 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_dot3(p, (yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 9013 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9010 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 211: /* arg: arg "..."  */
-#line 3406 "mrbgems/mruby-compiler/core/parse.y"
+#line 3403 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_dot3(p, (yyvsp[-1].nd), new_nil(p));
                     }
-#line 9021 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9018 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 212: /* arg: tBDOT3 arg  */
-#line 3410 "mrbgems/mruby-compiler/core/parse.y"
+#line 3407 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_dot3(p, new_nil(p), (yyvsp[0].nd));
                     }
-#line 9029 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9026 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 213: /* arg: arg '+' arg  */
-#line 3414 "mrbgems/mruby-compiler/core/parse.y"
+#line 3411 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "+", (yyvsp[0].nd));
                     }
-#line 9037 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9034 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 214: /* arg: arg '-' arg  */
-#line 3418 "mrbgems/mruby-compiler/core/parse.y"
+#line 3415 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "-", (yyvsp[0].nd));
                     }
-#line 9045 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9042 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 215: /* arg: arg '*' arg  */
-#line 3422 "mrbgems/mruby-compiler/core/parse.y"
+#line 3419 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "*", (yyvsp[0].nd));
                     }
-#line 9053 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9050 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 216: /* arg: arg '/' arg  */
-#line 3426 "mrbgems/mruby-compiler/core/parse.y"
+#line 3423 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "/", (yyvsp[0].nd));
                     }
-#line 9061 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9058 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 217: /* arg: arg '%' arg  */
-#line 3430 "mrbgems/mruby-compiler/core/parse.y"
+#line 3427 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "%", (yyvsp[0].nd));
                     }
-#line 9069 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9066 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 218: /* arg: arg tPOW arg  */
-#line 3434 "mrbgems/mruby-compiler/core/parse.y"
+#line 3431 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "**", (yyvsp[0].nd));
                     }
-#line 9077 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9074 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 219: /* arg: tUMINUS_NUM "integer literal" tPOW arg  */
-#line 3438 "mrbgems/mruby-compiler/core/parse.y"
+#line 3435 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_negate(p, call_bin_op(p, (yyvsp[-2].nd), "**", (yyvsp[0].nd)));
                     }
-#line 9085 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9082 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 220: /* arg: tUMINUS_NUM "float literal" tPOW arg  */
-#line 3442 "mrbgems/mruby-compiler/core/parse.y"
+#line 3439 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_negate(p, call_bin_op(p, (yyvsp[-2].nd), "**", (yyvsp[0].nd)));
                     }
-#line 9093 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9090 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 221: /* arg: "unary plus" arg  */
-#line 3446 "mrbgems/mruby-compiler/core/parse.y"
+#line 3443 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_uni_op(p, (yyvsp[0].nd), "+@");
                     }
-#line 9101 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9098 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 222: /* arg: "unary minus" arg  */
-#line 3450 "mrbgems/mruby-compiler/core/parse.y"
+#line 3447 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_negate(p, (yyvsp[0].nd));
                     }
-#line 9109 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9106 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 223: /* arg: arg '|' arg  */
-#line 3454 "mrbgems/mruby-compiler/core/parse.y"
+#line 3451 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "|", (yyvsp[0].nd));
                     }
-#line 9117 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9114 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 224: /* arg: arg '^' arg  */
-#line 3458 "mrbgems/mruby-compiler/core/parse.y"
+#line 3455 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "^", (yyvsp[0].nd));
                     }
-#line 9125 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9122 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 225: /* arg: arg '&' arg  */
-#line 3462 "mrbgems/mruby-compiler/core/parse.y"
+#line 3459 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "&", (yyvsp[0].nd));
                     }
-#line 9133 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9130 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 226: /* arg: arg "<=>" arg  */
-#line 3466 "mrbgems/mruby-compiler/core/parse.y"
+#line 3463 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "<=>", (yyvsp[0].nd));
                     }
-#line 9141 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9138 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 227: /* arg: arg '>' arg  */
-#line 3470 "mrbgems/mruby-compiler/core/parse.y"
+#line 3467 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), ">", (yyvsp[0].nd));
                     }
-#line 9149 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9146 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 228: /* arg: arg ">=" arg  */
-#line 3474 "mrbgems/mruby-compiler/core/parse.y"
+#line 3471 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), ">=", (yyvsp[0].nd));
                     }
-#line 9157 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9154 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 229: /* arg: arg '<' arg  */
-#line 3478 "mrbgems/mruby-compiler/core/parse.y"
+#line 3475 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "<", (yyvsp[0].nd));
                     }
-#line 9165 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9162 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 230: /* arg: arg "<=" arg  */
-#line 3482 "mrbgems/mruby-compiler/core/parse.y"
+#line 3479 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "<=", (yyvsp[0].nd));
                     }
-#line 9173 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9170 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 231: /* arg: arg "==" arg  */
-#line 3486 "mrbgems/mruby-compiler/core/parse.y"
+#line 3483 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "==", (yyvsp[0].nd));
                     }
-#line 9181 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9178 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 232: /* arg: arg "===" arg  */
-#line 3490 "mrbgems/mruby-compiler/core/parse.y"
+#line 3487 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "===", (yyvsp[0].nd));
                     }
-#line 9189 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9186 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 233: /* arg: arg "!=" arg  */
-#line 3494 "mrbgems/mruby-compiler/core/parse.y"
+#line 3491 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "!=", (yyvsp[0].nd));
                     }
-#line 9197 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9194 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 234: /* arg: arg "=~" arg  */
-#line 3498 "mrbgems/mruby-compiler/core/parse.y"
+#line 3495 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "=~", (yyvsp[0].nd));
                     }
-#line 9205 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9202 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 235: /* arg: arg "!~" arg  */
-#line 3502 "mrbgems/mruby-compiler/core/parse.y"
+#line 3499 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "!~", (yyvsp[0].nd));
                     }
-#line 9213 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9210 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 236: /* arg: '!' arg  */
-#line 3506 "mrbgems/mruby-compiler/core/parse.y"
+#line 3503 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_uni_op(p, cond((yyvsp[0].nd)), "!");
                     }
-#line 9221 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9218 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 237: /* arg: '~' arg  */
-#line 3510 "mrbgems/mruby-compiler/core/parse.y"
+#line 3507 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_uni_op(p, cond((yyvsp[0].nd)), "~");
                     }
-#line 9229 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9226 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 238: /* arg: arg "<<" arg  */
-#line 3514 "mrbgems/mruby-compiler/core/parse.y"
+#line 3511 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "<<", (yyvsp[0].nd));
                     }
-#line 9237 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9234 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 239: /* arg: arg ">>" arg  */
-#line 3518 "mrbgems/mruby-compiler/core/parse.y"
+#line 3515 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), ">>", (yyvsp[0].nd));
                     }
-#line 9245 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9242 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 240: /* arg: arg "&&" arg  */
-#line 3522 "mrbgems/mruby-compiler/core/parse.y"
+#line 3519 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_and(p, (yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 9253 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9250 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 241: /* arg: arg "||" arg  */
-#line 3526 "mrbgems/mruby-compiler/core/parse.y"
+#line 3523 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_or(p, (yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 9261 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9258 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 242: /* arg: arg '?' arg opt_nl ':' arg  */
-#line 3530 "mrbgems/mruby-compiler/core/parse.y"
+#line 3527 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_if(p, cond((yyvsp[-5].nd)), (yyvsp[-3].nd), (yyvsp[0].nd));
                     }
-#line 9269 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9266 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 243: /* arg: arg '?' arg opt_nl "label" arg  */
-#line 3534 "mrbgems/mruby-compiler/core/parse.y"
+#line 3531 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_if(p, cond((yyvsp[-5].nd)), (yyvsp[-3].nd), (yyvsp[0].nd));
                     }
-#line 9277 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9274 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 244: /* arg: defn_head f_opt_arglist_paren '=' arg  */
-#line 3538 "mrbgems/mruby-compiler/core/parse.y"
+#line 3535 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-3].nd);
                       endless_method_name(p, (yyvsp[-3].nd));
@@ -9286,11 +9283,11 @@ yyreduce:
                       nvars_unnest(p);
                       p->in_def--;
                     }
-#line 9290 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9287 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 245: /* arg: defn_head f_opt_arglist_paren '=' arg "'rescue' modifier" arg  */
-#line 3547 "mrbgems/mruby-compiler/core/parse.y"
+#line 3544 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-5].nd);
                       endless_method_name(p, (yyvsp[-5].nd));
@@ -9299,11 +9296,11 @@ yyreduce:
                       nvars_unnest(p);
                       p->in_def--;
                     }
-#line 9303 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9300 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 246: /* arg: defs_head f_opt_arglist_paren '=' arg  */
-#line 3556 "mrbgems/mruby-compiler/core/parse.y"
+#line 3553 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-3].nd);
                       void_expr_error(p, (yyvsp[0].nd));
@@ -9312,11 +9309,11 @@ yyreduce:
                       p->in_def--;
                       p->in_single--;
                     }
-#line 9316 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9313 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 247: /* arg: defs_head f_opt_arglist_paren '=' arg "'rescue' modifier" arg  */
-#line 3565 "mrbgems/mruby-compiler/core/parse.y"
+#line 3562 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-5].nd);
                       void_expr_error(p, (yyvsp[-2].nd));
@@ -9325,68 +9322,68 @@ yyreduce:
                       p->in_def--;
                       p->in_single--;
                     }
-#line 9329 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9326 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 248: /* arg: primary  */
-#line 3574 "mrbgems/mruby-compiler/core/parse.y"
+#line 3571 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[0].nd);
                     }
-#line 9337 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9334 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 250: /* aref_args: args trailer  */
-#line 3581 "mrbgems/mruby-compiler/core/parse.y"
+#line 3578 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-1].nd);
                     }
-#line 9345 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9342 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 251: /* aref_args: args comma assocs trailer  */
-#line 3585 "mrbgems/mruby-compiler/core/parse.y"
+#line 3582 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push((yyvsp[-3].nd), new_hash(p, (yyvsp[-1].nd)));
                     }
-#line 9353 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9350 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 252: /* aref_args: assocs trailer  */
-#line 3589 "mrbgems/mruby-compiler/core/parse.y"
+#line 3586 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = cons(new_kw_hash(p, (yyvsp[-1].nd)), 0);
                     }
-#line 9361 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9358 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 253: /* arg_rhs: arg  */
-#line 3595 "mrbgems/mruby-compiler/core/parse.y"
+#line 3592 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[0].nd);
                     }
-#line 9369 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9366 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 254: /* arg_rhs: arg "'rescue' modifier" arg  */
-#line 3599 "mrbgems/mruby-compiler/core/parse.y"
+#line 3596 "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 9378 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9375 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 255: /* paren_args: '(' opt_call_args ')'  */
-#line 3606 "mrbgems/mruby-compiler/core/parse.y"
+#line 3603 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-1].nd);
                     }
-#line 9386 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9383 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 256: /* paren_args: '(' args comma tBDOT3 rparen  */
-#line 3610 "mrbgems/mruby-compiler/core/parse.y"
+#line 3607 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       mrb_sym r = intern_op(mul);
                       mrb_sym k = intern_op(pow);
@@ -9395,11 +9392,11 @@ yyreduce:
                                         new_kw_hash(p, list1(cons(new_kw_rest_args(p, 0), new_lvar(p, k)))),
                                         new_block_arg(p, new_lvar(p, b)));
                     }
-#line 9399 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9396 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 257: /* paren_args: '(' tBDOT3 rparen  */
-#line 3619 "mrbgems/mruby-compiler/core/parse.y"
+#line 3616 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       mrb_sym r = intern_op(mul);
                       mrb_sym k = intern_op(pow);
@@ -9414,390 +9411,390 @@ yyreduce:
                         (yyval.nd) = 0;
                       }
                     }
-#line 9418 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9415 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 262: /* opt_call_args: args comma  */
-#line 3642 "mrbgems/mruby-compiler/core/parse.y"
+#line 3639 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_callargs(p,(yyvsp[-1].nd),0,0);
                     }
-#line 9426 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9423 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 263: /* opt_call_args: args comma assocs comma  */
-#line 3646 "mrbgems/mruby-compiler/core/parse.y"
+#line 3643 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_callargs(p,(yyvsp[-3].nd),new_kw_hash(p,(yyvsp[-1].nd)),0);
                     }
-#line 9434 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9431 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 264: /* opt_call_args: assocs comma  */
-#line 3650 "mrbgems/mruby-compiler/core/parse.y"
+#line 3647 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_callargs(p,0,new_kw_hash(p,(yyvsp[-1].nd)),0);
                     }
-#line 9442 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9439 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 265: /* call_args: command  */
-#line 3656 "mrbgems/mruby-compiler/core/parse.y"
+#line 3653 "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 9451 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9448 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 266: /* call_args: args opt_block_arg  */
-#line 3661 "mrbgems/mruby-compiler/core/parse.y"
+#line 3658 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_callargs(p, (yyvsp[-1].nd), 0, (yyvsp[0].nd));
                     }
-#line 9459 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9456 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 267: /* call_args: assocs opt_block_arg  */
-#line 3665 "mrbgems/mruby-compiler/core/parse.y"
+#line 3662 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_callargs(p, 0, new_kw_hash(p, (yyvsp[-1].nd)), (yyvsp[0].nd));
                     }
-#line 9467 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9464 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 268: /* call_args: args comma assocs opt_block_arg  */
-#line 3669 "mrbgems/mruby-compiler/core/parse.y"
+#line 3666 "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 9475 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9472 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 269: /* call_args: block_arg  */
-#line 3673 "mrbgems/mruby-compiler/core/parse.y"
+#line 3670 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_callargs(p, 0, 0, (yyvsp[0].nd));
                     }
-#line 9483 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9480 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 270: /* @7: %empty  */
-#line 3678 "mrbgems/mruby-compiler/core/parse.y"
+#line 3675 "mrbgems/mruby-compiler/core/parse.y"
                    {
                       (yyval.stack) = p->cmdarg_stack;
                       CMDARG_PUSH(1);
                     }
-#line 9492 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9489 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 271: /* command_args: @7 call_args  */
-#line 3683 "mrbgems/mruby-compiler/core/parse.y"
+#line 3680 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       p->cmdarg_stack = (yyvsp[-1].stack);
                       (yyval.nd) = (yyvsp[0].nd);
                     }
-#line 9501 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9498 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 272: /* block_arg: "&" arg  */
-#line 3690 "mrbgems/mruby-compiler/core/parse.y"
+#line 3687 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_block_arg(p, (yyvsp[0].nd));
                     }
-#line 9509 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9506 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 273: /* block_arg: "&"  */
-#line 3694 "mrbgems/mruby-compiler/core/parse.y"
+#line 3691 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_block_arg(p, 0);
                     }
-#line 9517 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9514 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 274: /* opt_block_arg: comma block_arg  */
-#line 3700 "mrbgems/mruby-compiler/core/parse.y"
+#line 3697 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[0].nd);
                     }
-#line 9525 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9522 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 275: /* opt_block_arg: none  */
-#line 3704 "mrbgems/mruby-compiler/core/parse.y"
+#line 3701 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = 0;
                     }
-#line 9533 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9530 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 277: /* args: arg  */
-#line 3713 "mrbgems/mruby-compiler/core/parse.y"
+#line 3710 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       void_expr_error(p, (yyvsp[0].nd));
                       (yyval.nd) = list1((yyvsp[0].nd));
                     }
-#line 9542 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9539 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 278: /* args: "*"  */
-#line 3718 "mrbgems/mruby-compiler/core/parse.y"
+#line 3715 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1(new_splat(p, new_lvar(p, intern_op(mul))));
                     }
-#line 9550 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9547 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 279: /* args: "*" arg  */
-#line 3722 "mrbgems/mruby-compiler/core/parse.y"
+#line 3719 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1(new_splat(p, (yyvsp[0].nd)));
                     }
-#line 9558 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9555 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 280: /* args: args comma arg  */
-#line 3726 "mrbgems/mruby-compiler/core/parse.y"
+#line 3723 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       void_expr_error(p, (yyvsp[0].nd));
                       (yyval.nd) = push((yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 9567 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9564 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 281: /* args: args comma "*"  */
-#line 3731 "mrbgems/mruby-compiler/core/parse.y"
+#line 3728 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push((yyvsp[-2].nd), new_splat(p, new_lvar(p, intern_op(mul))));
                     }
-#line 9575 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9572 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 282: /* args: args comma "*" arg  */
-#line 3735 "mrbgems/mruby-compiler/core/parse.y"
+#line 3732 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push((yyvsp[-3].nd), new_splat(p, (yyvsp[0].nd)));
                     }
-#line 9583 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9580 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 283: /* mrhs: args comma arg  */
-#line 3741 "mrbgems/mruby-compiler/core/parse.y"
+#line 3738 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       void_expr_error(p, (yyvsp[0].nd));
                       (yyval.nd) = push((yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 9592 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9589 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 284: /* mrhs: args comma "*" arg  */
-#line 3746 "mrbgems/mruby-compiler/core/parse.y"
+#line 3743 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push((yyvsp[-3].nd), new_splat(p, (yyvsp[0].nd)));
                     }
-#line 9600 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9597 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 285: /* mrhs: "*" arg  */
-#line 3750 "mrbgems/mruby-compiler/core/parse.y"
+#line 3747 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1(new_splat(p, (yyvsp[0].nd)));
                     }
-#line 9608 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9605 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 287: /* primary: string  */
-#line 3757 "mrbgems/mruby-compiler/core/parse.y"
+#line 3754 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_str(p, (yyvsp[0].nd));
                     }
-#line 9616 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9613 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 288: /* primary: xstring  */
-#line 3761 "mrbgems/mruby-compiler/core/parse.y"
+#line 3758 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_xstr(p, (yyvsp[0].nd));
                     }
-#line 9624 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9621 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 293: /* primary: "method"  */
-#line 3769 "mrbgems/mruby-compiler/core/parse.y"
+#line 3766 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_fcall(p, (yyvsp[0].id), 0);
                     }
-#line 9632 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9629 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 294: /* @8: %empty  */
-#line 3773 "mrbgems/mruby-compiler/core/parse.y"
+#line 3770 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.stack) = p->cmdarg_stack;
                       p->cmdarg_stack = 0;
                     }
-#line 9641 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9638 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 295: /* primary: "'begin'" @8 bodystmt "'end'"  */
-#line 3779 "mrbgems/mruby-compiler/core/parse.y"
+#line 3776 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       p->cmdarg_stack = (yyvsp[-2].stack);
                       (yyval.nd) = new_begin(p, (yyvsp[-1].nd));
                     }
-#line 9650 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9647 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 296: /* @9: %empty  */
-#line 3784 "mrbgems/mruby-compiler/core/parse.y"
+#line 3781 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.stack) = p->cmdarg_stack;
                       p->cmdarg_stack = 0;
                     }
-#line 9659 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9656 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 297: /* $@10: %empty  */
-#line 3788 "mrbgems/mruby-compiler/core/parse.y"
+#line 3785 "mrbgems/mruby-compiler/core/parse.y"
                        {p->lstate = EXPR_ENDARG;}
-#line 9665 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9662 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 298: /* primary: "(" @9 stmt $@10 rparen  */
-#line 3789 "mrbgems/mruby-compiler/core/parse.y"
+#line 3786 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       p->cmdarg_stack = (yyvsp[-3].stack);
                       (yyval.nd) = (yyvsp[-2].nd);
                     }
-#line 9674 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9671 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 299: /* $@11: %empty  */
-#line 3793 "mrbgems/mruby-compiler/core/parse.y"
+#line 3790 "mrbgems/mruby-compiler/core/parse.y"
                               {p->lstate = EXPR_ENDARG;}
-#line 9680 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9677 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 300: /* primary: "(" $@11 rparen  */
-#line 3794 "mrbgems/mruby-compiler/core/parse.y"
+#line 3791 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_nil(p);
                     }
-#line 9688 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9685 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 301: /* primary: tLPAREN compstmt ')'  */
-#line 3798 "mrbgems/mruby-compiler/core/parse.y"
+#line 3795 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-1].nd);
                     }
-#line 9696 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9693 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 302: /* primary: primary_value "::" "constant"  */
-#line 3802 "mrbgems/mruby-compiler/core/parse.y"
+#line 3799 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_colon2(p, (yyvsp[-2].nd), (yyvsp[0].id));
                     }
-#line 9704 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9701 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 303: /* primary: tCOLON3 "constant"  */
-#line 3806 "mrbgems/mruby-compiler/core/parse.y"
+#line 3803 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_colon3(p, (yyvsp[0].id));
                     }
-#line 9712 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9709 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 304: /* primary: "[" aref_args ']'  */
-#line 3810 "mrbgems/mruby-compiler/core/parse.y"
+#line 3807 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_array(p, (yyvsp[-1].nd));
                     }
-#line 9720 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9717 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 305: /* primary: tLBRACE assoc_list '}'  */
-#line 3814 "mrbgems/mruby-compiler/core/parse.y"
+#line 3811 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_hash(p, (yyvsp[-1].nd));
                     }
-#line 9728 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9725 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 306: /* primary: "'return'"  */
-#line 3818 "mrbgems/mruby-compiler/core/parse.y"
+#line 3815 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_return(p, 0);
                     }
-#line 9736 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9733 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 307: /* primary: "'yield'" opt_paren_args  */
-#line 3822 "mrbgems/mruby-compiler/core/parse.y"
+#line 3819 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_yield(p, (yyvsp[0].nd));
                     }
-#line 9744 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9741 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 308: /* primary: "'not'" '(' expr rparen  */
-#line 3826 "mrbgems/mruby-compiler/core/parse.y"
+#line 3823 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_uni_op(p, cond((yyvsp[-1].nd)), "!");
                     }
-#line 9752 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9749 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 309: /* primary: "'not'" '(' rparen  */
-#line 3830 "mrbgems/mruby-compiler/core/parse.y"
+#line 3827 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_uni_op(p, new_nil(p), "!");
                     }
-#line 9760 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9757 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 310: /* primary: operation brace_block  */
-#line 3834 "mrbgems/mruby-compiler/core/parse.y"
+#line 3831 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_fcall(p, (yyvsp[-1].id), new_callargs(p, 0, 0, (yyvsp[0].nd)));
                     }
-#line 9768 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9765 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 312: /* primary: method_call brace_block  */
-#line 3839 "mrbgems/mruby-compiler/core/parse.y"
+#line 3836 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       call_with_block(p, (yyvsp[-1].nd), (yyvsp[0].nd));
                       (yyval.nd) = (yyvsp[-1].nd);
                     }
-#line 9777 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9774 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 313: /* @12: %empty  */
-#line 3844 "mrbgems/mruby-compiler/core/parse.y"
+#line 3841 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       local_nest(p);
                       nvars_nest(p);
                       (yyval.num) = p->lpar_beg;
                       p->lpar_beg = ++p->paren_nest;
                     }
-#line 9788 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9785 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 314: /* @13: %empty  */
-#line 3851 "mrbgems/mruby-compiler/core/parse.y"
+#line 3848 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.stack) = p->cmdarg_stack;
                       p->cmdarg_stack = 0;
                     }
-#line 9797 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9794 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 315: /* primary: "->" @12 f_larglist @13 lambda_body  */
-#line 3856 "mrbgems/mruby-compiler/core/parse.y"
+#line 3853 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       p->lpar_beg = (yyvsp[-3].num);
                       (yyval.nd) = new_lambda(p, (yyvsp[-2].nd), (yyvsp[0].nd));
@@ -9806,149 +9803,149 @@ yyreduce:
                       p->cmdarg_stack = (yyvsp[-1].stack);
                       CMDARG_LEXPOP();
                     }
-#line 9810 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9807 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 316: /* primary: "'if'" expr_value then compstmt if_tail "'end'"  */
-#line 3868 "mrbgems/mruby-compiler/core/parse.y"
+#line 3865 "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 9819 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9816 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 317: /* primary: "'unless'" expr_value then compstmt opt_else "'end'"  */
-#line 3876 "mrbgems/mruby-compiler/core/parse.y"
+#line 3873 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_unless(p, cond((yyvsp[-4].nd)), (yyvsp[-2].nd), (yyvsp[-1].nd));
                       SET_LINENO((yyval.nd), (yyvsp[-5].num));
                     }
-#line 9828 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9825 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 318: /* $@14: %empty  */
-#line 3880 "mrbgems/mruby-compiler/core/parse.y"
+#line 3877 "mrbgems/mruby-compiler/core/parse.y"
                                 {COND_PUSH(1);}
-#line 9834 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9831 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 319: /* $@15: %empty  */
-#line 3880 "mrbgems/mruby-compiler/core/parse.y"
+#line 3877 "mrbgems/mruby-compiler/core/parse.y"
                                                               {COND_POP();}
-#line 9840 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9837 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 320: /* primary: "'while'" $@14 expr_value do $@15 compstmt "'end'"  */
-#line 3883 "mrbgems/mruby-compiler/core/parse.y"
+#line 3880 "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 9849 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9846 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 321: /* $@16: %empty  */
-#line 3887 "mrbgems/mruby-compiler/core/parse.y"
+#line 3884 "mrbgems/mruby-compiler/core/parse.y"
                                 {COND_PUSH(1);}
-#line 9855 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9852 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 322: /* $@17: %empty  */
-#line 3887 "mrbgems/mruby-compiler/core/parse.y"
+#line 3884 "mrbgems/mruby-compiler/core/parse.y"
                                                               {COND_POP();}
-#line 9861 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9858 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 323: /* primary: "'until'" $@16 expr_value do $@17 compstmt "'end'"  */
-#line 3890 "mrbgems/mruby-compiler/core/parse.y"
+#line 3887 "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 9870 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9867 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 324: /* primary: "'case'" expr_value opt_terms case_body "'end'"  */
-#line 3897 "mrbgems/mruby-compiler/core/parse.y"
+#line 3894 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_case(p, (yyvsp[-3].nd), (yyvsp[-1].nd));
                     }
-#line 9878 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9875 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 325: /* primary: "'case'" opt_terms case_body "'end'"  */
-#line 3901 "mrbgems/mruby-compiler/core/parse.y"
+#line 3898 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_case(p, 0, (yyvsp[-1].nd));
                     }
-#line 9886 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9883 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 326: /* $@18: %empty  */
-#line 3905 "mrbgems/mruby-compiler/core/parse.y"
+#line 3902 "mrbgems/mruby-compiler/core/parse.y"
                   {COND_PUSH(1);}
-#line 9892 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9889 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 327: /* $@19: %empty  */
-#line 3907 "mrbgems/mruby-compiler/core/parse.y"
+#line 3904 "mrbgems/mruby-compiler/core/parse.y"
                   {COND_POP();}
-#line 9898 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9895 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 328: /* primary: "'for'" for_var "'in'" $@18 expr_value do $@19 compstmt "'end'"  */
-#line 3910 "mrbgems/mruby-compiler/core/parse.y"
+#line 3907 "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 9907 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9904 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 329: /* @20: %empty  */
-#line 3916 "mrbgems/mruby-compiler/core/parse.y"
+#line 3913 "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 9918 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9915 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 330: /* primary: "'class'" cpath superclass @20 bodystmt "'end'"  */
-#line 3924 "mrbgems/mruby-compiler/core/parse.y"
+#line 3921 "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 9929 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9926 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 331: /* @21: %empty  */
-#line 3932 "mrbgems/mruby-compiler/core/parse.y"
+#line 3929 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.num) = p->in_def;
                       p->in_def = 0;
                     }
-#line 9938 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9935 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 332: /* @22: %empty  */
-#line 3937 "mrbgems/mruby-compiler/core/parse.y"
+#line 3934 "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 9948 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9945 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 333: /* primary: "'class'" "<<" expr @21 term @22 bodystmt "'end'"  */
-#line 3944 "mrbgems/mruby-compiler/core/parse.y"
+#line 3941 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_sclass(p, (yyvsp[-5].nd), (yyvsp[-1].nd));
                       SET_LINENO((yyval.nd), (yyvsp[-7].num));
@@ -9957,44 +9954,44 @@ yyreduce:
                       p->in_def = (yyvsp[-4].num);
                       p->in_single = node_to_int((yyvsp[-2].nd)->cdr);
                     }
-#line 9961 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9958 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 334: /* @23: %empty  */
-#line 3954 "mrbgems/mruby-compiler/core/parse.y"
+#line 3951 "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 9972 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9969 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 335: /* primary: "'module'" cpath @23 bodystmt "'end'"  */
-#line 3962 "mrbgems/mruby-compiler/core/parse.y"
+#line 3959 "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 9983 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9980 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 336: /* primary: defn_head f_arglist bodystmt "'end'"  */
-#line 3972 "mrbgems/mruby-compiler/core/parse.y"
+#line 3969 "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 9994 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9991 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 337: /* primary: defs_head f_arglist bodystmt "'end'"  */
-#line 3982 "mrbgems/mruby-compiler/core/parse.y"
+#line 3979 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-3].nd);
                       defs_setup(p, (yyval.nd), (yyvsp[-2].nd), (yyvsp[-1].nd));
@@ -10002,610 +9999,610 @@ yyreduce:
                       p->in_def--;
                       p->in_single--;
                     }
-#line 10006 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10003 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 338: /* primary: "'break'"  */
-#line 3990 "mrbgems/mruby-compiler/core/parse.y"
+#line 3987 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_break(p, 0);
                     }
-#line 10014 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10011 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 339: /* primary: "'next'"  */
-#line 3994 "mrbgems/mruby-compiler/core/parse.y"
+#line 3991 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_next(p, 0);
                     }
-#line 10022 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10019 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 340: /* primary: "'redo'"  */
-#line 3998 "mrbgems/mruby-compiler/core/parse.y"
+#line 3995 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_redo(p);
                     }
-#line 10030 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10027 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 341: /* primary: "'retry'"  */
-#line 4002 "mrbgems/mruby-compiler/core/parse.y"
+#line 3999 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_retry(p);
                     }
-#line 10038 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10035 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 342: /* primary_value: primary  */
-#line 4008 "mrbgems/mruby-compiler/core/parse.y"
+#line 4005 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[0].nd);
                       if (!(yyval.nd)) (yyval.nd) = new_nil(p);
                     }
-#line 10047 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10044 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 349: /* if_tail: "'elsif'" expr_value then compstmt if_tail  */
-#line 4027 "mrbgems/mruby-compiler/core/parse.y"
+#line 4024 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_if(p, cond((yyvsp[-3].nd)), (yyvsp[-1].nd), (yyvsp[0].nd));
                     }
-#line 10055 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10052 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 351: /* opt_else: "'else'" compstmt  */
-#line 4034 "mrbgems/mruby-compiler/core/parse.y"
+#line 4031 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[0].nd);
                     }
-#line 10063 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10060 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 352: /* for_var: lhs  */
-#line 4040 "mrbgems/mruby-compiler/core/parse.y"
+#line 4037 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1(list1((yyvsp[0].nd)));
                     }
-#line 10071 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10068 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 354: /* f_margs: f_arg  */
-#line 4047 "mrbgems/mruby-compiler/core/parse.y"
+#line 4044 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list3((yyvsp[0].nd),0,0);
                     }
-#line 10079 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10076 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 355: /* f_margs: f_arg ',' "*" f_norm_arg  */
-#line 4051 "mrbgems/mruby-compiler/core/parse.y"
+#line 4048 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list3((yyvsp[-3].nd), new_arg(p, (yyvsp[0].id)), 0);
                     }
-#line 10087 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10084 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 356: /* f_margs: f_arg ',' "*" f_norm_arg ',' f_arg  */
-#line 4055 "mrbgems/mruby-compiler/core/parse.y"
+#line 4052 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list3((yyvsp[-5].nd), new_arg(p, (yyvsp[-2].id)), (yyvsp[0].nd));
                     }
-#line 10095 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10092 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 357: /* f_margs: f_arg ',' "*"  */
-#line 4059 "mrbgems/mruby-compiler/core/parse.y"
+#line 4056 "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 10104 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10101 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 358: /* f_margs: f_arg ',' "*" ',' f_arg  */
-#line 4064 "mrbgems/mruby-compiler/core/parse.y"
+#line 4061 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list3((yyvsp[-4].nd), int_to_node(-1), (yyvsp[0].nd));
                     }
-#line 10112 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10109 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 359: /* f_margs: "*" f_norm_arg  */
-#line 4068 "mrbgems/mruby-compiler/core/parse.y"
+#line 4065 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list3(0, new_arg(p, (yyvsp[0].id)), 0);
                     }
-#line 10120 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10117 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 360: /* f_margs: "*" f_norm_arg ',' f_arg  */
-#line 4072 "mrbgems/mruby-compiler/core/parse.y"
+#line 4069 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list3(0, new_arg(p, (yyvsp[-2].id)), (yyvsp[0].nd));
                     }
-#line 10128 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10125 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 361: /* f_margs: "*"  */
-#line 4076 "mrbgems/mruby-compiler/core/parse.y"
+#line 4073 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       local_add_f(p, intern_op(mul));
                       (yyval.nd) = list3(0, int_to_node(-1), 0);
                     }
-#line 10137 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10134 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 362: /* $@24: %empty  */
-#line 4081 "mrbgems/mruby-compiler/core/parse.y"
+#line 4078 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       local_add_f(p, intern_op(mul));
                     }
-#line 10145 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10142 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 363: /* f_margs: "*" ',' $@24 f_arg  */
-#line 4085 "mrbgems/mruby-compiler/core/parse.y"
+#line 4082 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list3(0, int_to_node(-1), (yyvsp[0].nd));
                     }
-#line 10153 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10150 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 364: /* block_args_tail: f_block_kwarg ',' f_kwrest opt_f_block_arg  */
-#line 4091 "mrbgems/mruby-compiler/core/parse.y"
+#line 4088 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args_tail(p, (yyvsp[-3].nd), (yyvsp[-1].nd), (yyvsp[0].id));
                     }
-#line 10161 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10158 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 365: /* block_args_tail: f_block_kwarg opt_f_block_arg  */
-#line 4095 "mrbgems/mruby-compiler/core/parse.y"
+#line 4092 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args_tail(p, (yyvsp[-1].nd), 0, (yyvsp[0].id));
                     }
-#line 10169 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10166 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 366: /* block_args_tail: f_kwrest opt_f_block_arg  */
-#line 4099 "mrbgems/mruby-compiler/core/parse.y"
+#line 4096 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args_tail(p, 0, (yyvsp[-1].nd), (yyvsp[0].id));
                     }
-#line 10177 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10174 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 367: /* block_args_tail: f_block_arg  */
-#line 4103 "mrbgems/mruby-compiler/core/parse.y"
+#line 4100 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args_tail(p, 0, 0, (yyvsp[0].id));
                     }
-#line 10185 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10182 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 368: /* opt_block_args_tail: ',' block_args_tail  */
-#line 4109 "mrbgems/mruby-compiler/core/parse.y"
+#line 4106 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[0].nd);
                     }
-#line 10193 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10190 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 369: /* opt_block_args_tail: %empty  */
-#line 4113 "mrbgems/mruby-compiler/core/parse.y"
+#line 4110 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args_tail(p, 0, 0, 0);
                     }
-#line 10201 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10198 "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 4119 "mrbgems/mruby-compiler/core/parse.y"
+#line 4116 "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 10209 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10206 "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 4123 "mrbgems/mruby-compiler/core/parse.y"
+#line 4120 "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 10217 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10214 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 372: /* block_param: f_arg ',' f_block_optarg opt_block_args_tail  */
-#line 4127 "mrbgems/mruby-compiler/core/parse.y"
+#line 4124 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, (yyvsp[-3].nd), (yyvsp[-1].nd), 0, 0, (yyvsp[0].nd));
                     }
-#line 10225 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10222 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 373: /* block_param: f_arg ',' f_block_optarg ',' f_arg opt_block_args_tail  */
-#line 4131 "mrbgems/mruby-compiler/core/parse.y"
+#line 4128 "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 10233 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10230 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 374: /* block_param: f_arg ',' f_rest_arg opt_block_args_tail  */
-#line 4135 "mrbgems/mruby-compiler/core/parse.y"
+#line 4132 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, (yyvsp[-3].nd), 0, (yyvsp[-1].id), 0, (yyvsp[0].nd));
                     }
-#line 10241 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10238 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 375: /* block_param: f_arg ',' opt_block_args_tail  */
-#line 4139 "mrbgems/mruby-compiler/core/parse.y"
+#line 4136 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, (yyvsp[-2].nd), 0, 0, 0, (yyvsp[0].nd));
                     }
-#line 10249 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10246 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 376: /* block_param: f_arg ',' f_rest_arg ',' f_arg opt_block_args_tail  */
-#line 4143 "mrbgems/mruby-compiler/core/parse.y"
+#line 4140 "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 10257 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10254 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 377: /* block_param: f_arg opt_block_args_tail  */
-#line 4147 "mrbgems/mruby-compiler/core/parse.y"
+#line 4144 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, (yyvsp[-1].nd), 0, 0, 0, (yyvsp[0].nd));
                     }
-#line 10265 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10262 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 378: /* block_param: f_block_optarg ',' f_rest_arg opt_block_args_tail  */
-#line 4151 "mrbgems/mruby-compiler/core/parse.y"
+#line 4148 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, 0, (yyvsp[-3].nd), (yyvsp[-1].id), 0, (yyvsp[0].nd));
                     }
-#line 10273 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10270 "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 4155 "mrbgems/mruby-compiler/core/parse.y"
+#line 4152 "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 10281 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10278 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 380: /* block_param: f_block_optarg opt_block_args_tail  */
-#line 4159 "mrbgems/mruby-compiler/core/parse.y"
+#line 4156 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, 0, (yyvsp[-1].nd), 0, 0, (yyvsp[0].nd));
                     }
-#line 10289 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10286 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 381: /* block_param: f_block_optarg ',' f_arg opt_block_args_tail  */
-#line 4163 "mrbgems/mruby-compiler/core/parse.y"
+#line 4160 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, 0, (yyvsp[-3].nd), 0, (yyvsp[-1].nd), (yyvsp[0].nd));
                     }
-#line 10297 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10294 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 382: /* block_param: f_rest_arg opt_block_args_tail  */
-#line 4167 "mrbgems/mruby-compiler/core/parse.y"
+#line 4164 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, 0, 0, (yyvsp[-1].id), 0, (yyvsp[0].nd));
                     }
-#line 10305 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10302 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 383: /* block_param: f_rest_arg ',' f_arg opt_block_args_tail  */
-#line 4171 "mrbgems/mruby-compiler/core/parse.y"
+#line 4168 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, 0, 0, (yyvsp[-3].id), (yyvsp[-1].nd), (yyvsp[0].nd));
                     }
-#line 10313 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10310 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 384: /* block_param: block_args_tail  */
-#line 4175 "mrbgems/mruby-compiler/core/parse.y"
+#line 4172 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, 0, 0, 0, 0, (yyvsp[0].nd));
                     }
-#line 10321 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10318 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 385: /* opt_block_param: none  */
-#line 4181 "mrbgems/mruby-compiler/core/parse.y"
+#line 4178 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       local_add_blk(p);
                       (yyval.nd) = 0;
                     }
-#line 10330 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10327 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 386: /* opt_block_param: block_param_def  */
-#line 4186 "mrbgems/mruby-compiler/core/parse.y"
+#line 4183 "mrbgems/mruby-compiler/core/parse.y"
                    {
                       p->cmd_start = TRUE;
                       (yyval.nd) = (yyvsp[0].nd);
                     }
-#line 10339 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10336 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 387: /* $@25: %empty  */
-#line 4192 "mrbgems/mruby-compiler/core/parse.y"
+#line 4189 "mrbgems/mruby-compiler/core/parse.y"
                       {local_add_blk(p);}
-#line 10345 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10342 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 388: /* block_param_def: '|' $@25 opt_bv_decl '|'  */
-#line 4193 "mrbgems/mruby-compiler/core/parse.y"
+#line 4190 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = 0;
                     }
-#line 10353 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10350 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 389: /* block_param_def: "||"  */
-#line 4197 "mrbgems/mruby-compiler/core/parse.y"
+#line 4194 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       local_add_blk(p);
                       (yyval.nd) = 0;
                     }
-#line 10362 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10359 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 390: /* block_param_def: '|' block_param opt_bv_decl '|'  */
-#line 4202 "mrbgems/mruby-compiler/core/parse.y"
+#line 4199 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-2].nd);
                     }
-#line 10370 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10367 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 391: /* opt_bv_decl: opt_nl  */
-#line 4209 "mrbgems/mruby-compiler/core/parse.y"
+#line 4206 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = 0;
                     }
-#line 10378 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10375 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 392: /* opt_bv_decl: opt_nl ';' bv_decls opt_nl  */
-#line 4213 "mrbgems/mruby-compiler/core/parse.y"
+#line 4210 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = 0;
                     }
-#line 10386 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10383 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 395: /* bvar: "local variable or method"  */
-#line 4223 "mrbgems/mruby-compiler/core/parse.y"
+#line 4220 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       local_add_f(p, (yyvsp[0].id));
                       new_bv(p, (yyvsp[0].id));
                     }
-#line 10395 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10392 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 397: /* f_larglist: '(' f_args opt_bv_decl ')'  */
-#line 4231 "mrbgems/mruby-compiler/core/parse.y"
+#line 4228 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-2].nd);
                     }
-#line 10403 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10400 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 398: /* f_larglist: f_args  */
-#line 4235 "mrbgems/mruby-compiler/core/parse.y"
+#line 4232 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[0].nd);
                     }
-#line 10411 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10408 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 399: /* lambda_body: tLAMBEG compstmt '}'  */
-#line 4241 "mrbgems/mruby-compiler/core/parse.y"
+#line 4238 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-1].nd);
                     }
-#line 10419 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10416 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 400: /* lambda_body: "'do' for lambda" bodystmt "'end'"  */
-#line 4245 "mrbgems/mruby-compiler/core/parse.y"
+#line 4242 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-1].nd);
                     }
-#line 10427 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10424 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 401: /* @26: %empty  */
-#line 4251 "mrbgems/mruby-compiler/core/parse.y"
+#line 4248 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       local_nest(p);
                       nvars_nest(p);
                       (yyval.num) = p->lineno;
                     }
-#line 10437 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10434 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 402: /* do_block: "'do' for block" @26 opt_block_param bodystmt "'end'"  */
-#line 4259 "mrbgems/mruby-compiler/core/parse.y"
+#line 4256 "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 10448 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10445 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 403: /* block_call: command do_block  */
-#line 4268 "mrbgems/mruby-compiler/core/parse.y"
+#line 4265 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       call_with_block(p, (yyvsp[-1].nd), (yyvsp[0].nd));
                       (yyval.nd) = (yyvsp[-1].nd);
                     }
-#line 10457 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10454 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 404: /* block_call: block_call call_op2 operation2 opt_paren_args  */
-#line 4273 "mrbgems/mruby-compiler/core/parse.y"
+#line 4270 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-3].nd), (yyvsp[-1].id), (yyvsp[0].nd), (yyvsp[-2].num));
                     }
-#line 10465 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10462 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 405: /* block_call: block_call call_op2 operation2 opt_paren_args brace_block  */
-#line 4277 "mrbgems/mruby-compiler/core/parse.y"
+#line 4274 "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 10474 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10471 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 406: /* block_call: block_call call_op2 operation2 command_args do_block  */
-#line 4282 "mrbgems/mruby-compiler/core/parse.y"
+#line 4279 "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 10483 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10480 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 407: /* method_call: operation paren_args  */
-#line 4289 "mrbgems/mruby-compiler/core/parse.y"
+#line 4286 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_fcall(p, (yyvsp[-1].id), (yyvsp[0].nd));
                     }
-#line 10491 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10488 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 408: /* method_call: primary_value call_op operation2 opt_paren_args  */
-#line 4293 "mrbgems/mruby-compiler/core/parse.y"
+#line 4290 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-3].nd), (yyvsp[-1].id), (yyvsp[0].nd), (yyvsp[-2].num));
                     }
-#line 10499 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10496 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 409: /* method_call: primary_value "::" operation2 paren_args  */
-#line 4297 "mrbgems/mruby-compiler/core/parse.y"
+#line 4294 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-3].nd), (yyvsp[-1].id), (yyvsp[0].nd), tCOLON2);
                     }
-#line 10507 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10504 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 410: /* method_call: primary_value "::" operation3  */
-#line 4301 "mrbgems/mruby-compiler/core/parse.y"
+#line 4298 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-2].nd), (yyvsp[0].id), 0, tCOLON2);
                     }
-#line 10515 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10512 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 411: /* method_call: primary_value call_op paren_args  */
-#line 4305 "mrbgems/mruby-compiler/core/parse.y"
+#line 4302 "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 10523 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10520 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 412: /* method_call: primary_value "::" paren_args  */
-#line 4309 "mrbgems/mruby-compiler/core/parse.y"
+#line 4306 "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 10531 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10528 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 413: /* method_call: "'super'" paren_args  */
-#line 4313 "mrbgems/mruby-compiler/core/parse.y"
+#line 4310 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_super(p, (yyvsp[0].nd));
                     }
-#line 10539 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10536 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 414: /* method_call: "'super'"  */
-#line 4317 "mrbgems/mruby-compiler/core/parse.y"
+#line 4314 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_zsuper(p);
                     }
-#line 10547 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10544 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 415: /* method_call: primary_value '[' opt_call_args ']'  */
-#line 4321 "mrbgems/mruby-compiler/core/parse.y"
+#line 4318 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-3].nd), intern_op(aref), (yyvsp[-1].nd), '.');
                     }
-#line 10555 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10552 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 416: /* @27: %empty  */
-#line 4327 "mrbgems/mruby-compiler/core/parse.y"
+#line 4324 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       local_nest(p);
                       nvars_nest(p);
                       (yyval.num) = p->lineno;
                     }
-#line 10565 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10562 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 417: /* brace_block: '{' @27 opt_block_param compstmt '}'  */
-#line 4334 "mrbgems/mruby-compiler/core/parse.y"
+#line 4331 "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 10576 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10573 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 418: /* @28: %empty  */
-#line 4341 "mrbgems/mruby-compiler/core/parse.y"
+#line 4338 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       local_nest(p);
                       nvars_nest(p);
                       (yyval.num) = p->lineno;
                     }
-#line 10586 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10583 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 419: /* brace_block: "'do'" @28 opt_block_param bodystmt "'end'"  */
-#line 4348 "mrbgems/mruby-compiler/core/parse.y"
+#line 4345 "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 10597 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10594 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 420: /* case_body: "'when'" args then compstmt cases  */
-#line 4359 "mrbgems/mruby-compiler/core/parse.y"
+#line 4356 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = cons(cons((yyvsp[-3].nd), (yyvsp[-1].nd)), (yyvsp[0].nd));
                     }
-#line 10605 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10602 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 421: /* cases: opt_else  */
-#line 4365 "mrbgems/mruby-compiler/core/parse.y"
+#line 4362 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       if ((yyvsp[0].nd)) {
                         (yyval.nd) = cons(cons(0, (yyvsp[0].nd)), 0);
@@ -10614,155 +10611,155 @@ yyreduce:
                         (yyval.nd) = 0;
                       }
                     }
-#line 10618 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10615 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 423: /* opt_rescue: "'rescue'" exc_list exc_var then compstmt opt_rescue  */
-#line 4379 "mrbgems/mruby-compiler/core/parse.y"
+#line 4376 "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 10627 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10624 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 425: /* exc_list: arg  */
-#line 4387 "mrbgems/mruby-compiler/core/parse.y"
+#line 4384 "mrbgems/mruby-compiler/core/parse.y"
                     {
                         (yyval.nd) = list1((yyvsp[0].nd));
                     }
-#line 10635 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10632 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 428: /* exc_var: "=>" lhs  */
-#line 4395 "mrbgems/mruby-compiler/core/parse.y"
+#line 4392 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[0].nd);
                     }
-#line 10643 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10640 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 430: /* opt_ensure: "'ensure'" compstmt  */
-#line 4402 "mrbgems/mruby-compiler/core/parse.y"
+#line 4399 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[0].nd);
                     }
-#line 10651 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10648 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 437: /* string: string string_fragment  */
-#line 4416 "mrbgems/mruby-compiler/core/parse.y"
+#line 4413 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = append((yyvsp[-1].nd), (yyvsp[0].nd));
                     }
-#line 10659 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10656 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 438: /* string_fragment: "character literal"  */
-#line 4422 "mrbgems/mruby-compiler/core/parse.y"
+#line 4419 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       /* tCHAR is (len . str), wrap as cons list */
                       (yyval.nd) = list1((yyvsp[0].nd));
                     }
-#line 10668 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10665 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 439: /* string_fragment: tSTRING  */
-#line 4427 "mrbgems/mruby-compiler/core/parse.y"
+#line 4424 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       /* tSTRING is (len . str), wrap as cons list */
                       (yyval.nd) = list1((yyvsp[0].nd));
                     }
-#line 10677 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10674 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 440: /* string_fragment: "string literal" tSTRING  */
-#line 4432 "mrbgems/mruby-compiler/core/parse.y"
+#line 4429 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       /* $2 is (len . str), wrap as cons list */
                       (yyval.nd) = list1((yyvsp[0].nd));
                     }
-#line 10686 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10683 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 441: /* string_fragment: "string literal" string_rep tSTRING  */
-#line 4437 "mrbgems/mruby-compiler/core/parse.y"
+#line 4434 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push((yyvsp[-1].nd), (yyvsp[0].nd));
                     }
-#line 10694 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10691 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 443: /* string_rep: string_rep string_interp  */
-#line 4444 "mrbgems/mruby-compiler/core/parse.y"
+#line 4441 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = append((yyvsp[-1].nd), (yyvsp[0].nd));
                     }
-#line 10702 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10699 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 444: /* string_interp: tSTRING_MID  */
-#line 4450 "mrbgems/mruby-compiler/core/parse.y"
+#line 4447 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       /* $1 is already in (len . str) format */
                       (yyval.nd) = list1((yyvsp[0].nd));
                     }
-#line 10711 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10708 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 445: /* @29: %empty  */
-#line 4455 "mrbgems/mruby-compiler/core/parse.y"
+#line 4452 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push_strterm(p);
                     }
-#line 10719 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10716 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 446: /* string_interp: tSTRING_PART @29 compstmt '}'  */
-#line 4460 "mrbgems/mruby-compiler/core/parse.y"
+#line 4457 "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 10730 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10727 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 447: /* string_interp: tLITERAL_DELIM  */
-#line 4467 "mrbgems/mruby-compiler/core/parse.y"
+#line 4464 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1(new_literal_delim(p));
                     }
-#line 10738 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10735 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 448: /* string_interp: tHD_LITERAL_DELIM heredoc_bodies  */
-#line 4471 "mrbgems/mruby-compiler/core/parse.y"
+#line 4468 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1(new_literal_delim(p));
                     }
-#line 10746 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10743 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 449: /* xstring: tXSTRING_BEG tXSTRING  */
-#line 4477 "mrbgems/mruby-compiler/core/parse.y"
+#line 4474 "mrbgems/mruby-compiler/core/parse.y"
                     {
                         (yyval.nd) = cons((yyvsp[0].nd), (node*)NULL);
                     }
-#line 10754 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10751 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 450: /* xstring: tXSTRING_BEG string_rep tXSTRING  */
-#line 4481 "mrbgems/mruby-compiler/core/parse.y"
+#line 4478 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push((yyvsp[-1].nd), (yyvsp[0].nd));
                     }
-#line 10762 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10759 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 451: /* regexp: tREGEXP_BEG tREGEXP  */
-#line 4487 "mrbgems/mruby-compiler/core/parse.y"
+#line 4484 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       node *data = (yyvsp[0].nd);  /* ((len . pattern) . (flags . encoding)) */
                       const char *flags = (const char*)data->cdr->car;
@@ -10771,11 +10768,11 @@ yyreduce:
                       node *pattern_list = cons(data->car, (node*)NULL);
                       (yyval.nd) = new_dregx(p, pattern_list, flags, encoding);
                     }
-#line 10775 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10772 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 452: /* regexp: tREGEXP_BEG string_rep tREGEXP  */
-#line 4496 "mrbgems/mruby-compiler/core/parse.y"
+#line 4493 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       node *data = (yyvsp[0].nd);  /* ((len . pattern) . (flags . encoding)) */
                       const char *flags = (const char*)data->cdr->car;
@@ -10784,47 +10781,47 @@ yyreduce:
                       node *complete_list = push((yyvsp[-1].nd), data->car);
                       (yyval.nd) = new_dregx(p, complete_list, flags, encoding);
                     }
-#line 10788 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10785 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 456: /* heredoc_body: tHEREDOC_END  */
-#line 4514 "mrbgems/mruby-compiler/core/parse.y"
+#line 4511 "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 10798 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10795 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 457: /* heredoc_body: heredoc_string_rep tHEREDOC_END  */
-#line 4520 "mrbgems/mruby-compiler/core/parse.y"
+#line 4517 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       heredoc_end(p);
                     }
-#line 10806 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10803 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 460: /* heredoc_string_interp: tHD_STRING_MID  */
-#line 4530 "mrbgems/mruby-compiler/core/parse.y"
+#line 4527 "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 10816 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10813 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 461: /* @30: %empty  */
-#line 4536 "mrbgems/mruby-compiler/core/parse.y"
+#line 4533 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push_strterm(p);
                     }
-#line 10824 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10821 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 462: /* heredoc_string_interp: tHD_STRING_PART @30 compstmt '}'  */
-#line 4541 "mrbgems/mruby-compiler/core/parse.y"
+#line 4538 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       pop_strterm(p, (yyvsp[-2].nd));
                       parser_heredoc_info *info = parsing_heredoc_info(p);
@@ -10832,37 +10829,37 @@ yyreduce:
                       node *expr_elem = cons(int_to_node(-1), (yyvsp[-1].nd));
                       info->doc = push(push(info->doc, (yyvsp[-3].nd)), expr_elem);
                     }
-#line 10836 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10833 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 463: /* words: tWORDS_BEG tSTRING  */
-#line 4551 "mrbgems/mruby-compiler/core/parse.y"
+#line 4548 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_words(p, list1((yyvsp[0].nd)));
                     }
-#line 10844 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10841 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 464: /* words: tWORDS_BEG string_rep tSTRING  */
-#line 4555 "mrbgems/mruby-compiler/core/parse.y"
+#line 4552 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       node *n = (yyvsp[-1].nd);
                       n = push(n, (yyvsp[0].nd));
                       (yyval.nd) = new_words(p, n);
                     }
-#line 10854 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10851 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 465: /* symbol: basic_symbol  */
-#line 4564 "mrbgems/mruby-compiler/core/parse.y"
+#line 4561 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_sym(p, (yyvsp[0].id));
                     }
-#line 10862 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10859 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 466: /* symbol: "symbol" "string literal" string_rep tSTRING  */
-#line 4568 "mrbgems/mruby-compiler/core/parse.y"
+#line 4565 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       node *n = (yyvsp[-1].nd);
                       p->lstate = EXPR_ENDARG;
@@ -10874,183 +10871,183 @@ yyreduce:
                       }
                       (yyval.nd) = new_dsym(p, new_str(p, n));
                     }
-#line 10878 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10875 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 467: /* symbol: "symbol" "numbered parameter"  */
-#line 4580 "mrbgems/mruby-compiler/core/parse.y"
+#line 4577 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       mrb_sym sym = intern_numparam((yyvsp[0].num));
                       (yyval.nd) = new_sym(p, sym);
                     }
-#line 10887 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10884 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 468: /* basic_symbol: "symbol" sym  */
-#line 4587 "mrbgems/mruby-compiler/core/parse.y"
+#line 4584 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       p->lstate = EXPR_END;
                       (yyval.id) = (yyvsp[0].id);
                     }
-#line 10896 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10893 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 473: /* sym: tSTRING  */
-#line 4598 "mrbgems/mruby-compiler/core/parse.y"
+#line 4595 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.id) = new_strsym(p, (yyvsp[0].nd));
                     }
-#line 10904 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10901 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 474: /* sym: "string literal" tSTRING  */
-#line 4602 "mrbgems/mruby-compiler/core/parse.y"
+#line 4599 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.id) = new_strsym(p, (yyvsp[0].nd));
                     }
-#line 10912 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10909 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 475: /* symbols: tSYMBOLS_BEG tSTRING  */
-#line 4608 "mrbgems/mruby-compiler/core/parse.y"
+#line 4605 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_symbols(p, list1((yyvsp[0].nd)));
                     }
-#line 10920 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10917 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 476: /* symbols: tSYMBOLS_BEG string_rep tSTRING  */
-#line 4612 "mrbgems/mruby-compiler/core/parse.y"
+#line 4609 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       node *n = (yyvsp[-1].nd);
                       n = push(n, (yyvsp[0].nd));
                       (yyval.nd) = new_symbols(p, n);
                     }
-#line 10930 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10927 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 479: /* numeric: tUMINUS_NUM "integer literal"  */
-#line 4622 "mrbgems/mruby-compiler/core/parse.y"
+#line 4619 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_negate(p, (yyvsp[0].nd));
                     }
-#line 10938 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10935 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 480: /* numeric: tUMINUS_NUM "float literal"  */
-#line 4626 "mrbgems/mruby-compiler/core/parse.y"
+#line 4623 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_negate(p, (yyvsp[0].nd));
                     }
-#line 10946 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10943 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 481: /* variable: "local variable or method"  */
-#line 4632 "mrbgems/mruby-compiler/core/parse.y"
+#line 4629 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_lvar(p, (yyvsp[0].id));
                     }
-#line 10954 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10951 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 482: /* variable: "instance variable"  */
-#line 4636 "mrbgems/mruby-compiler/core/parse.y"
+#line 4633 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_ivar(p, (yyvsp[0].id));
                     }
-#line 10962 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10959 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 483: /* variable: "global variable"  */
-#line 4640 "mrbgems/mruby-compiler/core/parse.y"
+#line 4637 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_gvar(p, (yyvsp[0].id));
                     }
-#line 10970 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10967 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 484: /* variable: "class variable"  */
-#line 4644 "mrbgems/mruby-compiler/core/parse.y"
+#line 4641 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_cvar(p, (yyvsp[0].id));
                     }
-#line 10978 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10975 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 485: /* variable: "constant"  */
-#line 4648 "mrbgems/mruby-compiler/core/parse.y"
+#line 4645 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_const(p, (yyvsp[0].id));
                     }
-#line 10986 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10983 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 486: /* var_lhs: variable  */
-#line 4654 "mrbgems/mruby-compiler/core/parse.y"
+#line 4651 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       assignable(p, (yyvsp[0].nd));
                     }
-#line 10994 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10991 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 487: /* var_lhs: "numbered parameter"  */
-#line 4658 "mrbgems/mruby-compiler/core/parse.y"
+#line 4655 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       yyerror(&(yylsp[0]), p, "can't assign to numbered parameter");
                     }
-#line 11002 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10999 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 488: /* var_ref: variable  */
-#line 4664 "mrbgems/mruby-compiler/core/parse.y"
+#line 4661 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = var_reference(p, (yyvsp[0].nd));
                     }
-#line 11010 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11007 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 489: /* var_ref: "numbered parameter"  */
-#line 4668 "mrbgems/mruby-compiler/core/parse.y"
+#line 4665 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_nvar(p, (yyvsp[0].num));
                     }
-#line 11018 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11015 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 490: /* var_ref: "'nil'"  */
-#line 4672 "mrbgems/mruby-compiler/core/parse.y"
+#line 4669 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_nil(p);
                     }
-#line 11026 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11023 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 491: /* var_ref: "'self'"  */
-#line 4676 "mrbgems/mruby-compiler/core/parse.y"
+#line 4673 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_self(p);
                     }
-#line 11034 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11031 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 492: /* var_ref: "'true'"  */
-#line 4680 "mrbgems/mruby-compiler/core/parse.y"
+#line 4677 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_true(p);
                     }
-#line 11042 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11039 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 493: /* var_ref: "'false'"  */
-#line 4684 "mrbgems/mruby-compiler/core/parse.y"
+#line 4681 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_false(p);
                     }
-#line 11050 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11047 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 494: /* var_ref: "'__FILE__'"  */
-#line 4688 "mrbgems/mruby-compiler/core/parse.y"
+#line 4685 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       const char *fn = mrb_sym_name_len(p->mrb, p->filename_sym, NULL);
                       if (!fn) {
@@ -11058,686 +11055,686 @@ yyreduce:
                       }
                       (yyval.nd) = new_str(p, cons(cons(int_to_node(strlen(fn)), (node*)fn), (node*)NULL));
                     }
-#line 11062 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11059 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 495: /* var_ref: "'__LINE__'"  */
-#line 4696 "mrbgems/mruby-compiler/core/parse.y"
+#line 4693 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       char buf[16];
 
                       dump_int(p->lineno, buf);
                       (yyval.nd) = new_int(p, buf, 10, 0);
                     }
-#line 11073 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11070 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 496: /* var_ref: "'__ENCODING__'"  */
-#line 4703 "mrbgems/mruby-compiler/core/parse.y"
+#line 4700 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_fcall(p, MRB_SYM_2(p->mrb, __ENCODING__), 0);
                     }
-#line 11081 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11078 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 499: /* superclass: %empty  */
-#line 4713 "mrbgems/mruby-compiler/core/parse.y"
+#line 4710 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = 0;
                     }
-#line 11089 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11086 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 500: /* $@31: %empty  */
-#line 4717 "mrbgems/mruby-compiler/core/parse.y"
+#line 4714 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       p->lstate = EXPR_BEG;
                       p->cmd_start = TRUE;
                     }
-#line 11098 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11095 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 501: /* superclass: '<' $@31 expr_value term  */
-#line 4722 "mrbgems/mruby-compiler/core/parse.y"
+#line 4719 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-1].nd);
                     }
-#line 11106 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11103 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 504: /* f_arglist_paren: '(' f_args rparen  */
-#line 4738 "mrbgems/mruby-compiler/core/parse.y"
+#line 4735 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-1].nd);
                       p->lstate = EXPR_BEG;
                       p->cmd_start = TRUE;
                     }
-#line 11116 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11113 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 505: /* f_arglist_paren: '(' f_arg ',' tBDOT3 rparen  */
-#line 4744 "mrbgems/mruby-compiler/core/parse.y"
+#line 4741 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args_dots(p, (yyvsp[-3].nd));
                     }
-#line 11124 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11121 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 506: /* f_arglist_paren: '(' tBDOT3 rparen  */
-#line 4748 "mrbgems/mruby-compiler/core/parse.y"
+#line 4745 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args_dots(p, 0);
                     }
-#line 11132 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11129 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 508: /* f_arglist: f_args term  */
-#line 4755 "mrbgems/mruby-compiler/core/parse.y"
+#line 4752 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-1].nd);
                     }
-#line 11140 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11137 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 509: /* f_arglist: f_arg ',' tBDOT3 term  */
-#line 4759 "mrbgems/mruby-compiler/core/parse.y"
+#line 4756 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args_dots(p, (yyvsp[-3].nd));
                     }
-#line 11148 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11145 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 510: /* f_arglist: "..." term  */
-#line 4763 "mrbgems/mruby-compiler/core/parse.y"
+#line 4760 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args_dots(p, 0);
                     }
-#line 11156 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11153 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 511: /* f_label: "local variable or method" "label"  */
-#line 4769 "mrbgems/mruby-compiler/core/parse.y"
+#line 4766 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       local_nest(p);
                     }
-#line 11164 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11161 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 512: /* f_label: "numbered parameter" "label"  */
-#line 4773 "mrbgems/mruby-compiler/core/parse.y"
+#line 4770 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       local_nest(p);
                     }
-#line 11172 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11169 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 513: /* f_kw: f_label arg  */
-#line 4779 "mrbgems/mruby-compiler/core/parse.y"
+#line 4776 "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 11182 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11179 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 514: /* f_kw: f_label  */
-#line 4785 "mrbgems/mruby-compiler/core/parse.y"
+#line 4782 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_kw_arg(p, (yyvsp[0].id), 0);
                       local_unnest(p);
                     }
-#line 11191 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11188 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 515: /* f_block_kw: f_label primary_value  */
-#line 4792 "mrbgems/mruby-compiler/core/parse.y"
+#line 4789 "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 11201 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11198 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 516: /* f_block_kw: f_label  */
-#line 4798 "mrbgems/mruby-compiler/core/parse.y"
+#line 4795 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_kw_arg(p, (yyvsp[0].id), 0);
                       local_unnest(p);
                     }
-#line 11210 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11207 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 517: /* f_block_kwarg: f_block_kw  */
-#line 4805 "mrbgems/mruby-compiler/core/parse.y"
+#line 4802 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1((yyvsp[0].nd));
                     }
-#line 11218 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11215 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 518: /* f_block_kwarg: f_block_kwarg ',' f_block_kw  */
-#line 4809 "mrbgems/mruby-compiler/core/parse.y"
+#line 4806 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push((yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 11226 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11223 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 519: /* f_kwarg: f_kw  */
-#line 4815 "mrbgems/mruby-compiler/core/parse.y"
+#line 4812 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1((yyvsp[0].nd));
                     }
-#line 11234 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11231 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 520: /* f_kwarg: f_kwarg ',' f_kw  */
-#line 4819 "mrbgems/mruby-compiler/core/parse.y"
+#line 4816 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push((yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 11242 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11239 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 523: /* f_kwrest: kwrest_mark "local variable or method"  */
-#line 4829 "mrbgems/mruby-compiler/core/parse.y"
+#line 4826 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_kw_rest_args(p, (yyvsp[0].id));
                     }
-#line 11250 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11247 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 524: /* f_kwrest: kwrest_mark  */
-#line 4833 "mrbgems/mruby-compiler/core/parse.y"
+#line 4830 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_kw_rest_args(p, 0);
                     }
-#line 11258 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11255 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 525: /* args_tail: f_kwarg ',' f_kwrest opt_f_block_arg  */
-#line 4839 "mrbgems/mruby-compiler/core/parse.y"
+#line 4836 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args_tail(p, (yyvsp[-3].nd), (yyvsp[-1].nd), (yyvsp[0].id));
                     }
-#line 11266 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11263 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 526: /* args_tail: f_kwarg opt_f_block_arg  */
-#line 4843 "mrbgems/mruby-compiler/core/parse.y"
+#line 4840 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args_tail(p, (yyvsp[-1].nd), 0, (yyvsp[0].id));
                     }
-#line 11274 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11271 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 527: /* args_tail: f_kwrest opt_f_block_arg  */
-#line 4847 "mrbgems/mruby-compiler/core/parse.y"
+#line 4844 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args_tail(p, 0, (yyvsp[-1].nd), (yyvsp[0].id));
                     }
-#line 11282 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11279 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 528: /* args_tail: f_block_arg  */
-#line 4851 "mrbgems/mruby-compiler/core/parse.y"
+#line 4848 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args_tail(p, 0, 0, (yyvsp[0].id));
                     }
-#line 11290 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11287 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 529: /* opt_args_tail: ',' args_tail  */
-#line 4857 "mrbgems/mruby-compiler/core/parse.y"
+#line 4854 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[0].nd);
                     }
-#line 11298 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11295 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 530: /* opt_args_tail: %empty  */
-#line 4861 "mrbgems/mruby-compiler/core/parse.y"
+#line 4858 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args_tail(p, 0, 0, 0);
                     }
-#line 11306 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11303 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 531: /* f_args: f_arg ',' f_optarg ',' f_rest_arg opt_args_tail  */
-#line 4867 "mrbgems/mruby-compiler/core/parse.y"
+#line 4864 "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 11314 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11311 "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 4871 "mrbgems/mruby-compiler/core/parse.y"
+#line 4868 "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 11322 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11319 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 533: /* f_args: f_arg ',' f_optarg opt_args_tail  */
-#line 4875 "mrbgems/mruby-compiler/core/parse.y"
+#line 4872 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, (yyvsp[-3].nd), (yyvsp[-1].nd), 0, 0, (yyvsp[0].nd));
                     }
-#line 11330 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11327 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 534: /* f_args: f_arg ',' f_optarg ',' f_arg opt_args_tail  */
-#line 4879 "mrbgems/mruby-compiler/core/parse.y"
+#line 4876 "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 11338 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11335 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 535: /* f_args: f_arg ',' f_rest_arg opt_args_tail  */
-#line 4883 "mrbgems/mruby-compiler/core/parse.y"
+#line 4880 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, (yyvsp[-3].nd), 0, (yyvsp[-1].id), 0, (yyvsp[0].nd));
                     }
-#line 11346 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11343 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 536: /* f_args: f_arg ',' f_rest_arg ',' f_arg opt_args_tail  */
-#line 4887 "mrbgems/mruby-compiler/core/parse.y"
+#line 4884 "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 11354 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11351 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 537: /* f_args: f_arg opt_args_tail  */
-#line 4891 "mrbgems/mruby-compiler/core/parse.y"
+#line 4888 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, (yyvsp[-1].nd), 0, 0, 0, (yyvsp[0].nd));
                     }
-#line 11362 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11359 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 538: /* f_args: f_optarg ',' f_rest_arg opt_args_tail  */
-#line 4895 "mrbgems/mruby-compiler/core/parse.y"
+#line 4892 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, 0, (yyvsp[-3].nd), (yyvsp[-1].id), 0, (yyvsp[0].nd));
                     }
-#line 11370 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11367 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 539: /* f_args: f_optarg ',' f_rest_arg ',' f_arg opt_args_tail  */
-#line 4899 "mrbgems/mruby-compiler/core/parse.y"
+#line 4896 "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 11378 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11375 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 540: /* f_args: f_optarg opt_args_tail  */
-#line 4903 "mrbgems/mruby-compiler/core/parse.y"
+#line 4900 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, 0, (yyvsp[-1].nd), 0, 0, (yyvsp[0].nd));
                     }
-#line 11386 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11383 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 541: /* f_args: f_optarg ',' f_arg opt_args_tail  */
-#line 4907 "mrbgems/mruby-compiler/core/parse.y"
+#line 4904 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, 0, (yyvsp[-3].nd), 0, (yyvsp[-1].nd), (yyvsp[0].nd));
                     }
-#line 11394 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11391 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 542: /* f_args: f_rest_arg opt_args_tail  */
-#line 4911 "mrbgems/mruby-compiler/core/parse.y"
+#line 4908 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, 0, 0, (yyvsp[-1].id), 0, (yyvsp[0].nd));
                     }
-#line 11402 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11399 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 543: /* f_args: f_rest_arg ',' f_arg opt_args_tail  */
-#line 4915 "mrbgems/mruby-compiler/core/parse.y"
+#line 4912 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, 0, 0, (yyvsp[-3].id), (yyvsp[-1].nd), (yyvsp[0].nd));
                     }
-#line 11410 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11407 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 544: /* f_args: args_tail  */
-#line 4919 "mrbgems/mruby-compiler/core/parse.y"
+#line 4916 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, 0, 0, 0, 0, (yyvsp[0].nd));
                     }
-#line 11418 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11415 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 545: /* f_args: %empty  */
-#line 4923 "mrbgems/mruby-compiler/core/parse.y"
+#line 4920 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       local_add_f(p, 0);
                       (yyval.nd) = new_args(p, 0, 0, 0, 0, 0);
                     }
-#line 11427 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11424 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 546: /* f_bad_arg: "constant"  */
-#line 4930 "mrbgems/mruby-compiler/core/parse.y"
+#line 4927 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       yyerror(&(yylsp[0]), p, "formal argument cannot be a constant");
                       (yyval.nd) = 0;
                     }
-#line 11436 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11433 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 547: /* f_bad_arg: "instance variable"  */
-#line 4935 "mrbgems/mruby-compiler/core/parse.y"
+#line 4932 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       yyerror(&(yylsp[0]), p, "formal argument cannot be an instance variable");
                       (yyval.nd) = 0;
                     }
-#line 11445 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11442 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 548: /* f_bad_arg: "global variable"  */
-#line 4940 "mrbgems/mruby-compiler/core/parse.y"
+#line 4937 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       yyerror(&(yylsp[0]), p, "formal argument cannot be a global variable");
                       (yyval.nd) = 0;
                     }
-#line 11454 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11451 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 549: /* f_bad_arg: "class variable"  */
-#line 4945 "mrbgems/mruby-compiler/core/parse.y"
+#line 4942 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       yyerror(&(yylsp[0]), p, "formal argument cannot be a class variable");
                       (yyval.nd) = 0;
                     }
-#line 11463 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11460 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 550: /* f_bad_arg: "numbered parameter"  */
-#line 4950 "mrbgems/mruby-compiler/core/parse.y"
+#line 4947 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       yyerror(&(yylsp[0]), p, "formal argument cannot be a numbered parameter");
                       (yyval.nd) = 0;
                     }
-#line 11472 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11469 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 551: /* f_norm_arg: f_bad_arg  */
-#line 4957 "mrbgems/mruby-compiler/core/parse.y"
+#line 4954 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.id) = 0;
                     }
-#line 11480 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11477 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 552: /* f_norm_arg: "local variable or method"  */
-#line 4961 "mrbgems/mruby-compiler/core/parse.y"
+#line 4958 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       local_add_f(p, (yyvsp[0].id));
                       (yyval.id) = (yyvsp[0].id);
                     }
-#line 11489 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11486 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 553: /* f_arg_item: f_norm_arg  */
-#line 4968 "mrbgems/mruby-compiler/core/parse.y"
+#line 4965 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_arg(p, (yyvsp[0].id));
                     }
-#line 11497 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11494 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 554: /* @32: %empty  */
-#line 4972 "mrbgems/mruby-compiler/core/parse.y"
+#line 4969 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = local_switch(p);
                     }
-#line 11505 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11502 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 555: /* f_arg_item: tLPAREN @32 f_margs rparen  */
-#line 4976 "mrbgems/mruby-compiler/core/parse.y"
+#line 4973 "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 11515 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11512 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 556: /* f_arg: f_arg_item  */
-#line 4984 "mrbgems/mruby-compiler/core/parse.y"
+#line 4981 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1((yyvsp[0].nd));
                     }
-#line 11523 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11520 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 557: /* f_arg: f_arg ',' f_arg_item  */
-#line 4988 "mrbgems/mruby-compiler/core/parse.y"
+#line 4985 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push((yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 11531 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11528 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 558: /* f_opt_asgn: "local variable or method" '='  */
-#line 4994 "mrbgems/mruby-compiler/core/parse.y"
+#line 4991 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       local_add_f(p, (yyvsp[-1].id));
                       local_nest(p);
                       (yyval.id) = (yyvsp[-1].id);
                     }
-#line 11541 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11538 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 559: /* f_opt: f_opt_asgn arg  */
-#line 5002 "mrbgems/mruby-compiler/core/parse.y"
+#line 4999 "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 11551 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11548 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 560: /* f_block_opt: f_opt_asgn primary_value  */
-#line 5010 "mrbgems/mruby-compiler/core/parse.y"
+#line 5007 "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 11561 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11558 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 561: /* f_block_optarg: f_block_opt  */
-#line 5018 "mrbgems/mruby-compiler/core/parse.y"
+#line 5015 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1((yyvsp[0].nd));
                     }
-#line 11569 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11566 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 562: /* f_block_optarg: f_block_optarg ',' f_block_opt  */
-#line 5022 "mrbgems/mruby-compiler/core/parse.y"
+#line 5019 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push((yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 11577 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11574 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 563: /* f_optarg: f_opt  */
-#line 5028 "mrbgems/mruby-compiler/core/parse.y"
+#line 5025 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1((yyvsp[0].nd));
                     }
-#line 11585 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11582 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 564: /* f_optarg: f_optarg ',' f_opt  */
-#line 5032 "mrbgems/mruby-compiler/core/parse.y"
+#line 5029 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push((yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 11593 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11590 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 567: /* f_rest_arg: restarg_mark "local variable or method"  */
-#line 5042 "mrbgems/mruby-compiler/core/parse.y"
+#line 5039 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       local_add_f(p, (yyvsp[0].id));
                       (yyval.id) = (yyvsp[0].id);
                     }
-#line 11602 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11599 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 568: /* f_rest_arg: restarg_mark  */
-#line 5047 "mrbgems/mruby-compiler/core/parse.y"
+#line 5044 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.id) = intern_op(mul);
                       local_add_f(p, (yyval.id));
                     }
-#line 11611 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11608 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 571: /* f_block_arg: blkarg_mark "local variable or method"  */
-#line 5058 "mrbgems/mruby-compiler/core/parse.y"
+#line 5055 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.id) = (yyvsp[0].id);
                     }
-#line 11619 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11616 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 572: /* f_block_arg: blkarg_mark  */
-#line 5062 "mrbgems/mruby-compiler/core/parse.y"
+#line 5059 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.id) = intern_op(and);
                     }
-#line 11627 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11624 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 573: /* opt_f_block_arg: ',' f_block_arg  */
-#line 5068 "mrbgems/mruby-compiler/core/parse.y"
+#line 5065 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.id) = (yyvsp[0].id);
                     }
-#line 11635 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11632 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 574: /* opt_f_block_arg: none  */
-#line 5072 "mrbgems/mruby-compiler/core/parse.y"
+#line 5069 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.id) = 0;
                     }
-#line 11643 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11640 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 575: /* singleton: var_ref  */
-#line 5078 "mrbgems/mruby-compiler/core/parse.y"
+#line 5075 "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 11653 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11650 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 576: /* $@33: %empty  */
-#line 5083 "mrbgems/mruby-compiler/core/parse.y"
+#line 5080 "mrbgems/mruby-compiler/core/parse.y"
                       {p->lstate = EXPR_BEG;}
-#line 11659 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11656 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 577: /* singleton: '(' $@33 expr rparen  */
-#line 5084 "mrbgems/mruby-compiler/core/parse.y"
+#line 5081 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       prohibit_literals(p, (yyvsp[-1].nd));
                       (yyval.nd) = (yyvsp[-1].nd);
                     }
-#line 11668 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11665 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 579: /* assoc_list: assocs trailer  */
-#line 5092 "mrbgems/mruby-compiler/core/parse.y"
+#line 5089 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-1].nd);
                     }
-#line 11676 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11673 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 580: /* assocs: assoc  */
-#line 5098 "mrbgems/mruby-compiler/core/parse.y"
+#line 5095 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1((yyvsp[0].nd));
                     }
-#line 11684 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11681 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 581: /* assocs: assocs comma assoc  */
-#line 5102 "mrbgems/mruby-compiler/core/parse.y"
+#line 5099 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push((yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 11692 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11689 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 582: /* assoc: arg "=>" arg  */
-#line 5108 "mrbgems/mruby-compiler/core/parse.y"
+#line 5105 "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 11702 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11699 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 583: /* assoc: "local variable or method" "label" arg  */
-#line 5114 "mrbgems/mruby-compiler/core/parse.y"
+#line 5111 "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 11711 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11708 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 584: /* assoc: "local variable or method" "label"  */
-#line 5119 "mrbgems/mruby-compiler/core/parse.y"
+#line 5116 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = cons(new_sym(p, (yyvsp[-1].id)), label_reference(p, (yyvsp[-1].id)));
                     }
-#line 11719 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11716 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 585: /* assoc: "numbered parameter" "label"  */
-#line 5123 "mrbgems/mruby-compiler/core/parse.y"
+#line 5120 "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 11728 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11725 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 586: /* assoc: "numbered parameter" "label" arg  */
-#line 5128 "mrbgems/mruby-compiler/core/parse.y"
+#line 5125 "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 11737 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11734 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 587: /* assoc: string_fragment "label" arg  */
-#line 5133 "mrbgems/mruby-compiler/core/parse.y"
+#line 5130 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       void_expr_error(p, (yyvsp[0].nd));
                       if ((yyvsp[-2].nd)->cdr) {
@@ -11753,75 +11750,75 @@ yyreduce:
                         (yyval.nd) = cons(new_sym(p, new_strsym(p, (yyvsp[-2].nd)->car)), (yyvsp[0].nd));
                       }
                     }
-#line 11757 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11754 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 588: /* assoc: "**" arg  */
-#line 5149 "mrbgems/mruby-compiler/core/parse.y"
+#line 5146 "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 11766 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11763 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 589: /* assoc: "**"  */
-#line 5154 "mrbgems/mruby-compiler/core/parse.y"
+#line 5151 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = cons(new_kw_rest_args(p, 0), new_lvar(p, intern_op(pow)));
                     }
-#line 11774 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11771 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 602: /* call_op: '.'  */
-#line 5180 "mrbgems/mruby-compiler/core/parse.y"
+#line 5177 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.num) = '.';
                     }
-#line 11782 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11779 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 603: /* call_op: "&."  */
-#line 5184 "mrbgems/mruby-compiler/core/parse.y"
+#line 5181 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.num) = 0;
                     }
-#line 11790 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11787 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 605: /* call_op2: "::"  */
-#line 5191 "mrbgems/mruby-compiler/core/parse.y"
+#line 5188 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.num) = tCOLON2;
                     }
-#line 11798 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11795 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 614: /* term: ';'  */
-#line 5212 "mrbgems/mruby-compiler/core/parse.y"
+#line 5209 "mrbgems/mruby-compiler/core/parse.y"
                       {yyerrok;}
-#line 11804 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11801 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 616: /* nl: '\n'  */
-#line 5217 "mrbgems/mruby-compiler/core/parse.y"
+#line 5214 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       p->lineno += (yyvsp[0].num);
                       p->column = 0;
                     }
-#line 11813 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11810 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 620: /* none: %empty  */
-#line 5229 "mrbgems/mruby-compiler/core/parse.y"
+#line 5226 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = 0;
                     }
-#line 11821 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11818 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
 
-#line 11825 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11822 "mrbgems/mruby-compiler/core/y.tab.c"
 
       default: break;
     }
@@ -12054,7 +12051,7 @@ yyreturnlab:
   return yyresult;
 }
 
-#line 5233 "mrbgems/mruby-compiler/core/parse.y"
+#line 5230 "mrbgems/mruby-compiler/core/parse.y"
 
 #define pylval  (*((YYSTYPE*)(p->ylval)))