diff --git a/mrbgems/mruby-compiler/core/codegen.c b/mrbgems/mruby-compiler/core/codegen.c
index 1d9006530..48d7c44f3 100644
--- a/mrbgems/mruby-compiler/core/codegen.c
+++ b/mrbgems/mruby-compiler/core/codegen.c
@@ -5653,8 +5653,8 @@ static void
 gen_dregx_var(codegen_scope *s, node *varnode, int val)
 {
   struct mrb_ast_dregx_node *n = (struct mrb_ast_dregx_node*)varnode;
-  // Stack allocation for compatibility with existing codegen
-  struct mrb_ast_node temp_tree = { .car = n->list, .cdr = int_to_node(n->options) };
+  // Reconstruct the traditional structure: (list . regx)
+  struct mrb_ast_node temp_tree = { .car = (node*)n->list, .cdr = (node*)n->regx };
   codegen_dregx(s, (node*)&temp_tree, val);
 }
 
diff --git a/mrbgems/mruby-compiler/core/node.h b/mrbgems/mruby-compiler/core/node.h
index 4af977f6b..8eddbc4f7 100644
--- a/mrbgems/mruby-compiler/core/node.h
+++ b/mrbgems/mruby-compiler/core/node.h
@@ -708,7 +708,7 @@ struct mrb_ast_dxstr_node {
 struct mrb_ast_dregx_node {
   struct mrb_ast_var_header hdr;
   struct mrb_ast_node *list;
-  int options;
+  struct mrb_ast_node *regx;
 };
 
 struct mrb_ast_dregx_once_node {
diff --git a/mrbgems/mruby-compiler/core/parse.y b/mrbgems/mruby-compiler/core/parse.y
index aa3b4ce84..6c8b62dd9 100644
--- a/mrbgems/mruby-compiler/core/parse.y
+++ b/mrbgems/mruby-compiler/core/parse.y
@@ -2444,17 +2444,16 @@ new_regx(parser_state *p, const char *p1, const char* p2, const char* p3)
 static node*
 new_dregx(parser_state *p, node *a, node *b)
 {
-  if (!p->var_nodes_enabled) {
-    return cons_head((node*)NODE_DREGX, cons(a, b));
-  }
-
   size_t total_size = sizeof(struct mrb_ast_dregx_node);
   enum mrb_ast_size_class class = size_to_class(total_size);
   struct mrb_ast_dregx_node *n = (struct mrb_ast_dregx_node*)
     parser_alloc_var(p, total_size, class);
   init_var_header(&n->hdr, p, NODE_DREGX, class);
   n->list = a;
-  n->options = (int)(intptr_t)b;
+
+  // Store the whole regx structure for codegen
+  // b is (NODE_REGX . (pattern . (flags . encoding)))
+  n->regx = (struct mrb_ast_node*)b;
   return cons_head((node*)NODE_VARIABLE, (node*)n);
 }
 
@@ -4698,7 +4697,10 @@ string_fragment : tCHAR
                 | tSTRING
                 | tSTRING_BEG tSTRING
                     {
-                      $$ = $2;
+                      node *data = $2->cdr;  /* (string . length) */
+                      const char *string = (const char*)data->car;
+                      size_t len = (size_t)node_to_int(data->cdr);
+                      $$ = new_str(p, string, len);
                     }
                 | tSTRING_BEG string_rep tSTRING
                     {
@@ -4763,7 +4765,11 @@ xstring         : tXSTRING_BEG tXSTRING
 
 regexp          : tREGEXP_BEG tREGEXP
                     {
-                        $$ = $2;
+                      node *data = $2->cdr;  /* (pattern . (flags . encoding)) */
+                      const char *pattern = (const char*)data->car;
+                      const char *flags = (const char*)data->cdr->car;
+                      const char *encoding = (const char*)data->cdr->cdr;
+                      $$ = new_regx(p, pattern, flags, encoding);
                     }
                 | tREGEXP_BEG string_rep tREGEXP
                     {
@@ -6454,11 +6460,11 @@ parse_string(parser_state *p)
     else {
       encp = NULL;
     }
-    pylval.nd = new_regx(p, s, dup, encp);
+    pylval.nd = cons_head((node*)NODE_REGX, cons((node*)s, cons((node*)dup, (node*)encp)));
 
     return tREGEXP;
   }
-  pylval.nd = new_str(p, tok(p), toklen(p));
+  pylval.nd = cons_head((node*)NODE_STR, cons((node*)strndup(tok(p), toklen(p)), int_to_node(toklen(p))));
 
   return tSTRING;
 }
diff --git a/mrbgems/mruby-compiler/core/y.tab.c b/mrbgems/mruby-compiler/core/y.tab.c
index 7de6855cf..9ef72fbd4 100644
--- a/mrbgems/mruby-compiler/core/y.tab.c
+++ b/mrbgems/mruby-compiler/core/y.tab.c
@@ -2506,17 +2506,16 @@ new_regx(parser_state *p, const char *p1, const char* p2, const char* p3)
 static node*
 new_dregx(parser_state *p, node *a, node *b)
 {
-  if (!p->var_nodes_enabled) {
-    return cons_head((node*)NODE_DREGX, cons(a, b));
-  }
-
   size_t total_size = sizeof(struct mrb_ast_dregx_node);
   enum mrb_ast_size_class class = size_to_class(total_size);
   struct mrb_ast_dregx_node *n = (struct mrb_ast_dregx_node*)
     parser_alloc_var(p, total_size, class);
   init_var_header(&n->hdr, p, NODE_DREGX, class);
   n->list = a;
-  n->options = (int)(intptr_t)b;
+
+  // Store the whole regx structure for codegen
+  // b is (NODE_REGX . (pattern . (flags . encoding)))
+  n->regx = (struct mrb_ast_node*)b;
   return cons_head((node*)NODE_VARIABLE, (node*)n);
 }
 
@@ -2866,7 +2865,7 @@ prohibit_literals(parser_state *p, node *n)
 /* xxx ----------------------------- */
 
 
-#line 2870 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 2869 "mrbgems/mruby-compiler/core/y.tab.c"
 
 # ifndef YY_CAST
 #  ifdef __cplusplus
@@ -3037,7 +3036,7 @@ extern int yydebug;
 #if ! defined YYSTYPE && ! defined YYSTYPE_IS_DECLARED
 union YYSTYPE
 {
-#line 2813 "mrbgems/mruby-compiler/core/parse.y"
+#line 2812 "mrbgems/mruby-compiler/core/parse.y"
 
     node *nd;
     mrb_sym id;
@@ -3045,7 +3044,7 @@ union YYSTYPE
     stack_type stack;
     const struct vtable *vars;
 
-#line 3049 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 3048 "mrbgems/mruby-compiler/core/y.tab.c"
 
 };
 typedef union YYSTYPE YYSTYPE;
@@ -3804,69 +3803,69 @@ static const yytype_uint8 yytranslate[] =
 /* YYRLINE[YYN] -- Source line where rule number YYN was defined.  */
 static const yytype_int16 yyrline[] =
 {
-       0,  2984,  2984,  2984,  2994,  3000,  3004,  3008,  3012,  3018,
-    3020,  3019,  3033,  3059,  3065,  3069,  3073,  3077,  3083,  3083,
-    3087,  3091,  3095,  3099,  3108,  3117,  3121,  3126,  3127,  3131,
-    3135,  3139,  3143,  3149,  3152,  3156,  3160,  3164,  3168,  3172,
-    3177,  3181,  3190,  3199,  3208,  3217,  3224,  3225,  3229,  3233,
-    3234,  3238,  3242,  3246,  3250,  3254,  3264,  3263,  3278,  3287,
-    3288,  3291,  3292,  3299,  3298,  3313,  3317,  3322,  3326,  3331,
-    3335,  3340,  3344,  3348,  3352,  3356,  3362,  3366,  3372,  3373,
-    3379,  3383,  3387,  3391,  3395,  3399,  3403,  3407,  3411,  3415,
-    3421,  3422,  3428,  3432,  3438,  3442,  3448,  3452,  3456,  3460,
-    3464,  3468,  3474,  3480,  3487,  3491,  3495,  3499,  3503,  3507,
-    3513,  3519,  3524,  3530,  3534,  3537,  3541,  3545,  3552,  3553,
-    3554,  3555,  3560,  3567,  3568,  3571,  3575,  3575,  3581,  3582,
-    3583,  3584,  3585,  3586,  3587,  3588,  3589,  3590,  3591,  3592,
-    3593,  3594,  3595,  3596,  3597,  3598,  3599,  3600,  3601,  3602,
-    3603,  3604,  3605,  3606,  3607,  3608,  3609,  3610,  3613,  3613,
-    3613,  3614,  3614,  3615,  3615,  3615,  3616,  3616,  3616,  3616,
-    3617,  3617,  3617,  3618,  3618,  3618,  3619,  3619,  3619,  3619,
-    3620,  3620,  3620,  3620,  3621,  3621,  3621,  3621,  3622,  3622,
-    3622,  3622,  3623,  3623,  3623,  3623,  3624,  3624,  3627,  3631,
-    3635,  3639,  3643,  3647,  3651,  3656,  3661,  3666,  3670,  3674,
-    3678,  3682,  3686,  3690,  3694,  3698,  3702,  3706,  3710,  3714,
-    3718,  3722,  3726,  3730,  3734,  3738,  3742,  3746,  3750,  3754,
-    3758,  3762,  3766,  3770,  3774,  3778,  3782,  3786,  3790,  3794,
-    3798,  3802,  3806,  3810,  3814,  3823,  3832,  3841,  3850,  3856,
-    3857,  3861,  3865,  3871,  3875,  3882,  3886,  3895,  3912,  3913,
-    3916,  3917,  3918,  3922,  3926,  3932,  3937,  3941,  3945,  3949,
-    3955,  3955,  3966,  3970,  3976,  3980,  3986,  3989,  3994,  3998,
-    4002,  4007,  4011,  4017,  4022,  4026,  4032,  4033,  4034,  4035,
-    4036,  4037,  4038,  4039,  4044,  4043,  4055,  4059,  4054,  4064,
-    4064,  4068,  4072,  4076,  4080,  4084,  4088,  4092,  4096,  4100,
-    4104,  4108,  4109,  4115,  4122,  4114,  4135,  4143,  4151,  4151,
-    4151,  4158,  4158,  4158,  4165,  4171,  4176,  4178,  4175,  4187,
-    4185,  4203,  4208,  4201,  4225,  4223,  4239,  4249,  4260,  4264,
-    4268,  4272,  4278,  4285,  4286,  4287,  4290,  4291,  4294,  4295,
-    4303,  4304,  4310,  4314,  4317,  4321,  4325,  4329,  4334,  4338,
-    4342,  4346,  4352,  4351,  4361,  4365,  4369,  4373,  4379,  4384,
-    4389,  4393,  4397,  4401,  4405,  4409,  4413,  4417,  4421,  4425,
-    4429,  4433,  4437,  4441,  4445,  4451,  4456,  4463,  4463,  4467,
-    4472,  4479,  4483,  4489,  4490,  4493,  4498,  4501,  4505,  4511,
-    4515,  4522,  4521,  4538,  4548,  4552,  4557,  4564,  4568,  4572,
-    4576,  4580,  4584,  4588,  4592,  4596,  4603,  4602,  4617,  4616,
-    4632,  4640,  4649,  4652,  4659,  4662,  4666,  4667,  4670,  4674,
-    4677,  4681,  4684,  4685,  4686,  4687,  4690,  4691,  4697,  4698,
-    4699,  4703,  4716,  4717,  4723,  4728,  4727,  4737,  4741,  4747,
-    4751,  4764,  4768,  4774,  4777,  4778,  4781,  4787,  4793,  4794,
-    4797,  4804,  4803,  4816,  4820,  4834,  4838,  4850,  4857,  4864,
-    4865,  4866,  4867,  4868,  4872,  4878,  4882,  4892,  4893,  4894,
-    4898,  4904,  4908,  4912,  4916,  4920,  4926,  4930,  4936,  4940,
-    4944,  4948,  4952,  4956,  4960,  4968,  4975,  4981,  4982,  4986,
-    4990,  4989,  5006,  5007,  5010,  5016,  5020,  5026,  5027,  5031,
-    5035,  5041,  5045,  5051,  5057,  5064,  5070,  5077,  5081,  5087,
-    5091,  5097,  5098,  5101,  5105,  5111,  5115,  5119,  5123,  5129,
-    5134,  5139,  5143,  5147,  5151,  5155,  5159,  5163,  5167,  5171,
-    5175,  5179,  5183,  5187,  5191,  5196,  5202,  5207,  5212,  5217,
-    5222,  5229,  5233,  5240,  5245,  5244,  5256,  5260,  5266,  5274,
-    5282,  5290,  5294,  5300,  5304,  5310,  5311,  5314,  5319,  5326,
-    5327,  5330,  5334,  5340,  5344,  5350,  5356,  5356,  5363,  5364,
-    5370,  5374,  5380,  5386,  5391,  5395,  5400,  5405,  5415,  5420,
-    5426,  5427,  5428,  5431,  5432,  5433,  5434,  5437,  5438,  5439,
-    5442,  5443,  5446,  5450,  5456,  5457,  5463,  5464,  5467,  5468,
-    5471,  5474,  5475,  5476,  5479,  5480,  5483,  5488,  5491,  5492,
-    5496
+       0,  2983,  2983,  2983,  2993,  2999,  3003,  3007,  3011,  3017,
+    3019,  3018,  3032,  3058,  3064,  3068,  3072,  3076,  3082,  3082,
+    3086,  3090,  3094,  3098,  3107,  3116,  3120,  3125,  3126,  3130,
+    3134,  3138,  3142,  3148,  3151,  3155,  3159,  3163,  3167,  3171,
+    3176,  3180,  3189,  3198,  3207,  3216,  3223,  3224,  3228,  3232,
+    3233,  3237,  3241,  3245,  3249,  3253,  3263,  3262,  3277,  3286,
+    3287,  3290,  3291,  3298,  3297,  3312,  3316,  3321,  3325,  3330,
+    3334,  3339,  3343,  3347,  3351,  3355,  3361,  3365,  3371,  3372,
+    3378,  3382,  3386,  3390,  3394,  3398,  3402,  3406,  3410,  3414,
+    3420,  3421,  3427,  3431,  3437,  3441,  3447,  3451,  3455,  3459,
+    3463,  3467,  3473,  3479,  3486,  3490,  3494,  3498,  3502,  3506,
+    3512,  3518,  3523,  3529,  3533,  3536,  3540,  3544,  3551,  3552,
+    3553,  3554,  3559,  3566,  3567,  3570,  3574,  3574,  3580,  3581,
+    3582,  3583,  3584,  3585,  3586,  3587,  3588,  3589,  3590,  3591,
+    3592,  3593,  3594,  3595,  3596,  3597,  3598,  3599,  3600,  3601,
+    3602,  3603,  3604,  3605,  3606,  3607,  3608,  3609,  3612,  3612,
+    3612,  3613,  3613,  3614,  3614,  3614,  3615,  3615,  3615,  3615,
+    3616,  3616,  3616,  3617,  3617,  3617,  3618,  3618,  3618,  3618,
+    3619,  3619,  3619,  3619,  3620,  3620,  3620,  3620,  3621,  3621,
+    3621,  3621,  3622,  3622,  3622,  3622,  3623,  3623,  3626,  3630,
+    3634,  3638,  3642,  3646,  3650,  3655,  3660,  3665,  3669,  3673,
+    3677,  3681,  3685,  3689,  3693,  3697,  3701,  3705,  3709,  3713,
+    3717,  3721,  3725,  3729,  3733,  3737,  3741,  3745,  3749,  3753,
+    3757,  3761,  3765,  3769,  3773,  3777,  3781,  3785,  3789,  3793,
+    3797,  3801,  3805,  3809,  3813,  3822,  3831,  3840,  3849,  3855,
+    3856,  3860,  3864,  3870,  3874,  3881,  3885,  3894,  3911,  3912,
+    3915,  3916,  3917,  3921,  3925,  3931,  3936,  3940,  3944,  3948,
+    3954,  3954,  3965,  3969,  3975,  3979,  3985,  3988,  3993,  3997,
+    4001,  4006,  4010,  4016,  4021,  4025,  4031,  4032,  4033,  4034,
+    4035,  4036,  4037,  4038,  4043,  4042,  4054,  4058,  4053,  4063,
+    4063,  4067,  4071,  4075,  4079,  4083,  4087,  4091,  4095,  4099,
+    4103,  4107,  4108,  4114,  4121,  4113,  4134,  4142,  4150,  4150,
+    4150,  4157,  4157,  4157,  4164,  4170,  4175,  4177,  4174,  4186,
+    4184,  4202,  4207,  4200,  4224,  4222,  4238,  4248,  4259,  4263,
+    4267,  4271,  4277,  4284,  4285,  4286,  4289,  4290,  4293,  4294,
+    4302,  4303,  4309,  4313,  4316,  4320,  4324,  4328,  4333,  4337,
+    4341,  4345,  4351,  4350,  4360,  4364,  4368,  4372,  4378,  4383,
+    4388,  4392,  4396,  4400,  4404,  4408,  4412,  4416,  4420,  4424,
+    4428,  4432,  4436,  4440,  4444,  4450,  4455,  4462,  4462,  4466,
+    4471,  4478,  4482,  4488,  4489,  4492,  4497,  4500,  4504,  4510,
+    4514,  4521,  4520,  4537,  4547,  4551,  4556,  4563,  4567,  4571,
+    4575,  4579,  4583,  4587,  4591,  4595,  4602,  4601,  4616,  4615,
+    4631,  4639,  4648,  4651,  4658,  4661,  4665,  4666,  4669,  4673,
+    4676,  4680,  4683,  4684,  4685,  4686,  4689,  4690,  4696,  4697,
+    4698,  4705,  4718,  4719,  4725,  4730,  4729,  4739,  4743,  4749,
+    4753,  4766,  4774,  4780,  4783,  4784,  4787,  4793,  4799,  4800,
+    4803,  4810,  4809,  4822,  4826,  4840,  4844,  4856,  4863,  4870,
+    4871,  4872,  4873,  4874,  4878,  4884,  4888,  4898,  4899,  4900,
+    4904,  4910,  4914,  4918,  4922,  4926,  4932,  4936,  4942,  4946,
+    4950,  4954,  4958,  4962,  4966,  4974,  4981,  4987,  4988,  4992,
+    4996,  4995,  5012,  5013,  5016,  5022,  5026,  5032,  5033,  5037,
+    5041,  5047,  5051,  5057,  5063,  5070,  5076,  5083,  5087,  5093,
+    5097,  5103,  5104,  5107,  5111,  5117,  5121,  5125,  5129,  5135,
+    5140,  5145,  5149,  5153,  5157,  5161,  5165,  5169,  5173,  5177,
+    5181,  5185,  5189,  5193,  5197,  5202,  5208,  5213,  5218,  5223,
+    5228,  5235,  5239,  5246,  5251,  5250,  5262,  5266,  5272,  5280,
+    5288,  5296,  5300,  5306,  5310,  5316,  5317,  5320,  5325,  5332,
+    5333,  5336,  5340,  5346,  5350,  5356,  5362,  5362,  5369,  5370,
+    5376,  5380,  5386,  5392,  5397,  5401,  5406,  5411,  5421,  5426,
+    5432,  5433,  5434,  5437,  5438,  5439,  5440,  5443,  5444,  5445,
+    5448,  5449,  5452,  5456,  5462,  5463,  5469,  5470,  5473,  5474,
+    5477,  5480,  5481,  5482,  5485,  5486,  5489,  5494,  5497,  5498,
+    5502
 };
 #endif
 
@@ -7843,7 +7842,7 @@ YYLTYPE yylloc = yyloc_default;
 
 
 
-#line 7847 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7846 "mrbgems/mruby-compiler/core/y.tab.c"
 
   yylsp[0] = yylloc;
   goto yysetstate;
@@ -8056,84 +8055,84 @@ yyreduce:
   switch (yyn)
     {
   case 2: /* $@1: %empty  */
-#line 2984 "mrbgems/mruby-compiler/core/parse.y"
+#line 2983 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       p->lstate = EXPR_BEG;
                       if (!p->locals) p->locals = cons(0,0);
                     }
-#line 8065 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8064 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 3: /* program: $@1 top_compstmt  */
-#line 2989 "mrbgems/mruby-compiler/core/parse.y"
+#line 2988 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       p->tree = new_scope(p, (yyvsp[0].nd));
                     }
-#line 8073 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8072 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 4: /* top_compstmt: top_stmts opt_terms  */
-#line 2995 "mrbgems/mruby-compiler/core/parse.y"
+#line 2994 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-1].nd);
                     }
-#line 8081 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8080 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 5: /* top_stmts: none  */
-#line 3001 "mrbgems/mruby-compiler/core/parse.y"
+#line 3000 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_stmts(p, 0);
                     }
-#line 8089 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8088 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 6: /* top_stmts: top_stmt  */
-#line 3005 "mrbgems/mruby-compiler/core/parse.y"
+#line 3004 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_stmts(p, (yyvsp[0].nd));
                     }
-#line 8097 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8096 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 7: /* top_stmts: top_stmts terms top_stmt  */
-#line 3009 "mrbgems/mruby-compiler/core/parse.y"
+#line 3008 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push((yyvsp[-2].nd), newline_node((yyvsp[0].nd)));
                     }
-#line 8105 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8104 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 8: /* top_stmts: error top_stmt  */
-#line 3013 "mrbgems/mruby-compiler/core/parse.y"
+#line 3012 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_stmts(p, 0);
                     }
-#line 8113 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8112 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 10: /* @2: %empty  */
-#line 3020 "mrbgems/mruby-compiler/core/parse.y"
+#line 3019 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = local_switch(p);
                       nvars_block(p);
                     }
-#line 8122 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8121 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 11: /* top_stmt: "'BEGIN'" @2 '{' top_compstmt '}'  */
-#line 3025 "mrbgems/mruby-compiler/core/parse.y"
+#line 3024 "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 8133 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8132 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 12: /* bodystmt: compstmt opt_rescue opt_else opt_ensure  */
-#line 3037 "mrbgems/mruby-compiler/core/parse.y"
+#line 3036 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       if ((yyvsp[-2].nd)) {
                         (yyval.nd) = new_rescue(p, (yyvsp[-3].nd), (yyvsp[-2].nd), (yyvsp[-1].nd));
@@ -8154,89 +8153,89 @@ yyreduce:
                         }
                       }
                     }
-#line 8158 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8157 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 13: /* compstmt: stmts opt_terms  */
-#line 3060 "mrbgems/mruby-compiler/core/parse.y"
+#line 3059 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-1].nd);
                     }
-#line 8166 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8165 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 14: /* stmts: none  */
-#line 3066 "mrbgems/mruby-compiler/core/parse.y"
+#line 3065 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_stmts(p, 0);
                     }
-#line 8174 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8173 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 15: /* stmts: stmt  */
-#line 3070 "mrbgems/mruby-compiler/core/parse.y"
+#line 3069 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_stmts(p, (yyvsp[0].nd));
                     }
-#line 8182 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8181 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 16: /* stmts: stmts terms stmt  */
-#line 3074 "mrbgems/mruby-compiler/core/parse.y"
+#line 3073 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push((yyvsp[-2].nd), newline_node((yyvsp[0].nd)));
                     }
-#line 8190 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8189 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 17: /* stmts: error stmt  */
-#line 3078 "mrbgems/mruby-compiler/core/parse.y"
+#line 3077 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_stmts(p, (yyvsp[0].nd));
                     }
-#line 8198 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8197 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 18: /* $@3: %empty  */
-#line 3083 "mrbgems/mruby-compiler/core/parse.y"
+#line 3082 "mrbgems/mruby-compiler/core/parse.y"
                                      {p->lstate = EXPR_FNAME;}
-#line 8204 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8203 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 19: /* stmt: "'alias'" fsym $@3 fsym  */
-#line 3084 "mrbgems/mruby-compiler/core/parse.y"
+#line 3083 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_alias(p, (yyvsp[-2].id), (yyvsp[0].id));
                     }
-#line 8212 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8211 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 20: /* stmt: "'undef'" undef_list  */
-#line 3088 "mrbgems/mruby-compiler/core/parse.y"
+#line 3087 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_undef(p, (yyvsp[0].nd));
                     }
-#line 8220 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8219 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 21: /* stmt: stmt "'if' modifier" expr_value  */
-#line 3092 "mrbgems/mruby-compiler/core/parse.y"
+#line 3091 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_if(p, cond((yyvsp[0].nd)), (yyvsp[-2].nd), 0);
                     }
-#line 8228 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8227 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 22: /* stmt: stmt "'unless' modifier" expr_value  */
-#line 3096 "mrbgems/mruby-compiler/core/parse.y"
+#line 3095 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_unless(p, cond((yyvsp[0].nd)), (yyvsp[-2].nd), 0);
                     }
-#line 8236 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8235 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 23: /* stmt: stmt "'while' modifier" expr_value  */
-#line 3100 "mrbgems/mruby-compiler/core/parse.y"
+#line 3099 "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));
@@ -8245,11 +8244,11 @@ yyreduce:
                         (yyval.nd) = new_while(p, cond((yyvsp[0].nd)), (yyvsp[-2].nd));
                       }
                     }
-#line 8249 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8248 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 24: /* stmt: stmt "'until' modifier" expr_value  */
-#line 3109 "mrbgems/mruby-compiler/core/parse.y"
+#line 3108 "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));
@@ -8258,127 +8257,127 @@ yyreduce:
                         (yyval.nd) = new_until(p, cond((yyvsp[0].nd)), (yyvsp[-2].nd));
                       }
                     }
-#line 8262 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8261 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 25: /* stmt: stmt "'rescue' modifier" stmt  */
-#line 3118 "mrbgems/mruby-compiler/core/parse.y"
+#line 3117 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_mod_rescue(p, (yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 8270 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8269 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 26: /* stmt: "'END'" '{' compstmt '}'  */
-#line 3122 "mrbgems/mruby-compiler/core/parse.y"
+#line 3121 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       yyerror(&(yylsp[-3]), p, "END not supported");
                       (yyval.nd) = new_postexe(p, (yyvsp[-1].nd));
                     }
-#line 8279 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8278 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 28: /* stmt: mlhs '=' command_call  */
-#line 3128 "mrbgems/mruby-compiler/core/parse.y"
+#line 3127 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_masgn(p, (yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 8287 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8286 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 29: /* stmt: lhs '=' mrhs  */
-#line 3132 "mrbgems/mruby-compiler/core/parse.y"
+#line 3131 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_asgn(p, (yyvsp[-2].nd), new_array(p, (yyvsp[0].nd)));
                     }
-#line 8295 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8294 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 30: /* stmt: mlhs '=' arg  */
-#line 3136 "mrbgems/mruby-compiler/core/parse.y"
+#line 3135 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_masgn(p, (yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 8303 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8302 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 31: /* stmt: mlhs '=' mrhs  */
-#line 3140 "mrbgems/mruby-compiler/core/parse.y"
+#line 3139 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_masgn(p, (yyvsp[-2].nd), new_array(p, (yyvsp[0].nd)));
                     }
-#line 8311 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8310 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 32: /* stmt: arg "=>" "local variable or method"  */
-#line 3144 "mrbgems/mruby-compiler/core/parse.y"
+#line 3143 "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 8321 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8320 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 34: /* command_asgn: lhs '=' command_rhs  */
-#line 3153 "mrbgems/mruby-compiler/core/parse.y"
+#line 3152 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_asgn(p, (yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 8329 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8328 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 35: /* command_asgn: var_lhs tOP_ASGN command_rhs  */
-#line 3157 "mrbgems/mruby-compiler/core/parse.y"
+#line 3156 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_op_asgn(p, (yyvsp[-2].nd), (yyvsp[-1].id), (yyvsp[0].nd));
                     }
-#line 8337 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8336 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 36: /* command_asgn: primary_value '[' opt_call_args ']' tOP_ASGN command_rhs  */
-#line 3161 "mrbgems/mruby-compiler/core/parse.y"
+#line 3160 "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 8345 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8344 "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 3165 "mrbgems/mruby-compiler/core/parse.y"
+#line 3164 "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 8353 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8352 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 38: /* command_asgn: primary_value call_op "constant" tOP_ASGN command_rhs  */
-#line 3169 "mrbgems/mruby-compiler/core/parse.y"
+#line 3168 "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 8361 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8360 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 39: /* command_asgn: primary_value "::" "constant" tOP_ASGN command_call  */
-#line 3173 "mrbgems/mruby-compiler/core/parse.y"
+#line 3172 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       yyerror(&(yylsp[-4]), p, "constant re-assignment");
                       (yyval.nd) = 0;
                     }
-#line 8370 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8369 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 40: /* command_asgn: primary_value "::" "local variable or method" tOP_ASGN command_rhs  */
-#line 3178 "mrbgems/mruby-compiler/core/parse.y"
+#line 3177 "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 8378 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8377 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 41: /* command_asgn: defn_head f_opt_arglist_paren '=' command  */
-#line 3182 "mrbgems/mruby-compiler/core/parse.y"
+#line 3181 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-3].nd);
                       endless_method_name(p, (yyvsp[-3].nd));
@@ -8387,11 +8386,11 @@ yyreduce:
                       nvars_unnest(p);
                       p->in_def--;
                     }
-#line 8391 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8390 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 42: /* command_asgn: defn_head f_opt_arglist_paren '=' command "'rescue' modifier" arg  */
-#line 3191 "mrbgems/mruby-compiler/core/parse.y"
+#line 3190 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-5].nd);
                       endless_method_name(p, (yyvsp[-5].nd));
@@ -8400,11 +8399,11 @@ yyreduce:
                       nvars_unnest(p);
                       p->in_def--;
                     }
-#line 8404 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8403 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 43: /* command_asgn: defs_head f_opt_arglist_paren '=' command  */
-#line 3200 "mrbgems/mruby-compiler/core/parse.y"
+#line 3199 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-3].nd);
                       void_expr_error(p, (yyvsp[0].nd));
@@ -8413,11 +8412,11 @@ yyreduce:
                       p->in_def--;
                       p->in_single--;
                     }
-#line 8417 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8416 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 44: /* command_asgn: defs_head f_opt_arglist_paren '=' command "'rescue' modifier" arg  */
-#line 3209 "mrbgems/mruby-compiler/core/parse.y"
+#line 3208 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-5].nd);
                       void_expr_error(p, (yyvsp[-2].nd));
@@ -8426,79 +8425,79 @@ yyreduce:
                       p->in_def--;
                       p->in_single--;
                     }
-#line 8430 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8429 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 45: /* command_asgn: backref tOP_ASGN command_rhs  */
-#line 3218 "mrbgems/mruby-compiler/core/parse.y"
+#line 3217 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       backref_error(p, (yyvsp[-2].nd));
                       (yyval.nd) = new_stmts(p, 0);
                     }
-#line 8439 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8438 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 47: /* command_rhs: command_call "'rescue' modifier" stmt  */
-#line 3226 "mrbgems/mruby-compiler/core/parse.y"
+#line 3225 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_mod_rescue(p, (yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 8447 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8446 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 50: /* expr: expr "'and'" expr  */
-#line 3235 "mrbgems/mruby-compiler/core/parse.y"
+#line 3234 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_and(p, (yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 8455 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8454 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 51: /* expr: expr "'or'" expr  */
-#line 3239 "mrbgems/mruby-compiler/core/parse.y"
+#line 3238 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_or(p, (yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 8463 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8462 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 52: /* expr: "'not'" opt_nl expr  */
-#line 3243 "mrbgems/mruby-compiler/core/parse.y"
+#line 3242 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_uni_op(p, cond((yyvsp[0].nd)), "!");
                     }
-#line 8471 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8470 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 53: /* expr: '!' command_call  */
-#line 3247 "mrbgems/mruby-compiler/core/parse.y"
+#line 3246 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_uni_op(p, cond((yyvsp[0].nd)), "!");
                     }
-#line 8479 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8478 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 55: /* defn_head: "'def'" fname  */
-#line 3255 "mrbgems/mruby-compiler/core/parse.y"
+#line 3254 "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 8490 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8489 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 56: /* $@4: %empty  */
-#line 3264 "mrbgems/mruby-compiler/core/parse.y"
+#line 3263 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       p->lstate = EXPR_FNAME;
                     }
-#line 8498 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8497 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 57: /* defs_head: "'def'" singleton dot_or_colon $@4 fname  */
-#line 3268 "mrbgems/mruby-compiler/core/parse.y"
+#line 3267 "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;
@@ -8507,1054 +8506,1054 @@ yyreduce:
                       nvars_block(p);
                       p->lstate = EXPR_ENDFN; /* force for args */
                     }
-#line 8511 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8510 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 58: /* expr_value: expr  */
-#line 3279 "mrbgems/mruby-compiler/core/parse.y"
+#line 3278 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       if (!(yyvsp[0].nd)) (yyval.nd) = new_nil(p);
                       else {
                         (yyval.nd) = (yyvsp[0].nd);
                       }
                     }
-#line 8522 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8521 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 62: /* block_command: block_call call_op2 operation2 command_args  */
-#line 3293 "mrbgems/mruby-compiler/core/parse.y"
+#line 3292 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-3].nd), (yyvsp[-1].id), (yyvsp[0].nd), (yyvsp[-2].num));
                     }
-#line 8530 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8529 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 63: /* $@5: %empty  */
-#line 3299 "mrbgems/mruby-compiler/core/parse.y"
+#line 3298 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       local_nest(p);
                       nvars_nest(p);
                     }
-#line 8539 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8538 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 64: /* cmd_brace_block: "{" $@5 opt_block_param compstmt '}'  */
-#line 3306 "mrbgems/mruby-compiler/core/parse.y"
+#line 3305 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_block(p, (yyvsp[-2].nd), (yyvsp[-1].nd));
                       local_unnest(p);
                       nvars_unnest(p);
                     }
-#line 8549 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8548 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 65: /* command: operation command_args  */
-#line 3314 "mrbgems/mruby-compiler/core/parse.y"
+#line 3313 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_fcall(p, (yyvsp[-1].id), (yyvsp[0].nd));
                     }
-#line 8557 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8556 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 66: /* command: operation command_args cmd_brace_block  */
-#line 3318 "mrbgems/mruby-compiler/core/parse.y"
+#line 3317 "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 8566 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8565 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 67: /* command: primary_value call_op operation2 command_args  */
-#line 3323 "mrbgems/mruby-compiler/core/parse.y"
+#line 3322 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-3].nd), (yyvsp[-1].id), (yyvsp[0].nd), (yyvsp[-2].num));
                     }
-#line 8574 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8573 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 68: /* command: primary_value call_op operation2 command_args cmd_brace_block  */
-#line 3327 "mrbgems/mruby-compiler/core/parse.y"
+#line 3326 "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 8583 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8582 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 69: /* command: primary_value "::" operation2 command_args  */
-#line 3332 "mrbgems/mruby-compiler/core/parse.y"
+#line 3331 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-3].nd), (yyvsp[-1].id), (yyvsp[0].nd), tCOLON2);
                     }
-#line 8591 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8590 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 70: /* command: primary_value "::" operation2 command_args cmd_brace_block  */
-#line 3336 "mrbgems/mruby-compiler/core/parse.y"
+#line 3335 "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 8600 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8599 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 71: /* command: "'super'" command_args  */
-#line 3341 "mrbgems/mruby-compiler/core/parse.y"
+#line 3340 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_super(p, (yyvsp[0].nd));
                     }
-#line 8608 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8607 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 72: /* command: "'yield'" command_args  */
-#line 3345 "mrbgems/mruby-compiler/core/parse.y"
+#line 3344 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_yield(p, (yyvsp[0].nd));
                     }
-#line 8616 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8615 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 73: /* command: "'return'" call_args  */
-#line 3349 "mrbgems/mruby-compiler/core/parse.y"
+#line 3348 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_return(p, ret_args(p, (yyvsp[0].nd)));
                     }
-#line 8624 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8623 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 74: /* command: "'break'" call_args  */
-#line 3353 "mrbgems/mruby-compiler/core/parse.y"
+#line 3352 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_break(p, ret_args(p, (yyvsp[0].nd)));
                     }
-#line 8632 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8631 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 75: /* command: "'next'" call_args  */
-#line 3357 "mrbgems/mruby-compiler/core/parse.y"
+#line 3356 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_next(p, ret_args(p, (yyvsp[0].nd)));
                     }
-#line 8640 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8639 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 76: /* mlhs: mlhs_basic  */
-#line 3363 "mrbgems/mruby-compiler/core/parse.y"
+#line 3362 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[0].nd);
                     }
-#line 8648 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8647 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 77: /* mlhs: tLPAREN mlhs_inner rparen  */
-#line 3367 "mrbgems/mruby-compiler/core/parse.y"
+#line 3366 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-1].nd);
                     }
-#line 8656 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8655 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 79: /* mlhs_inner: tLPAREN mlhs_inner rparen  */
-#line 3374 "mrbgems/mruby-compiler/core/parse.y"
+#line 3373 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-1].nd);
                     }
-#line 8664 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8663 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 80: /* mlhs_basic: mlhs_list  */
-#line 3380 "mrbgems/mruby-compiler/core/parse.y"
+#line 3379 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1((yyvsp[0].nd));
                     }
-#line 8672 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8671 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 81: /* mlhs_basic: mlhs_list mlhs_item  */
-#line 3384 "mrbgems/mruby-compiler/core/parse.y"
+#line 3383 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1(push((yyvsp[-1].nd),(yyvsp[0].nd)));
                     }
-#line 8680 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8679 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 82: /* mlhs_basic: mlhs_list "*" mlhs_node  */
-#line 3388 "mrbgems/mruby-compiler/core/parse.y"
+#line 3387 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list2((yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 8688 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8687 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 83: /* mlhs_basic: mlhs_list "*" mlhs_node ',' mlhs_post  */
-#line 3392 "mrbgems/mruby-compiler/core/parse.y"
+#line 3391 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list3((yyvsp[-4].nd), (yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 8696 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8695 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 84: /* mlhs_basic: mlhs_list "*"  */
-#line 3396 "mrbgems/mruby-compiler/core/parse.y"
+#line 3395 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list2((yyvsp[-1].nd), new_nil(p));
                     }
-#line 8704 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8703 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 85: /* mlhs_basic: mlhs_list "*" ',' mlhs_post  */
-#line 3400 "mrbgems/mruby-compiler/core/parse.y"
+#line 3399 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list3((yyvsp[-3].nd), new_nil(p), (yyvsp[0].nd));
                     }
-#line 8712 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8711 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 86: /* mlhs_basic: "*" mlhs_node  */
-#line 3404 "mrbgems/mruby-compiler/core/parse.y"
+#line 3403 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list2(0, (yyvsp[0].nd));
                     }
-#line 8720 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8719 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 87: /* mlhs_basic: "*" mlhs_node ',' mlhs_post  */
-#line 3408 "mrbgems/mruby-compiler/core/parse.y"
+#line 3407 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list3(0, (yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 8728 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8727 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 88: /* mlhs_basic: "*"  */
-#line 3412 "mrbgems/mruby-compiler/core/parse.y"
+#line 3411 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list2(0, new_nil(p));
                     }
-#line 8736 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8735 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 89: /* mlhs_basic: "*" ',' mlhs_post  */
-#line 3416 "mrbgems/mruby-compiler/core/parse.y"
+#line 3415 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list3(0, new_nil(p), (yyvsp[0].nd));
                     }
-#line 8744 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8743 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 91: /* mlhs_item: tLPAREN mlhs_inner rparen  */
-#line 3423 "mrbgems/mruby-compiler/core/parse.y"
+#line 3422 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_masgn(p, (yyvsp[-1].nd), NULL);
                     }
-#line 8752 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8751 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 92: /* mlhs_list: mlhs_item ','  */
-#line 3429 "mrbgems/mruby-compiler/core/parse.y"
+#line 3428 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1((yyvsp[-1].nd));
                     }
-#line 8760 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8759 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 93: /* mlhs_list: mlhs_list mlhs_item ','  */
-#line 3433 "mrbgems/mruby-compiler/core/parse.y"
+#line 3432 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push((yyvsp[-2].nd), (yyvsp[-1].nd));
                     }
-#line 8768 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8767 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 94: /* mlhs_post: mlhs_item  */
-#line 3439 "mrbgems/mruby-compiler/core/parse.y"
+#line 3438 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1((yyvsp[0].nd));
                     }
-#line 8776 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8775 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 95: /* mlhs_post: mlhs_list mlhs_item  */
-#line 3443 "mrbgems/mruby-compiler/core/parse.y"
+#line 3442 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push((yyvsp[-1].nd), (yyvsp[0].nd));
                     }
-#line 8784 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8783 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 96: /* mlhs_node: variable  */
-#line 3449 "mrbgems/mruby-compiler/core/parse.y"
+#line 3448 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       assignable(p, (yyvsp[0].nd));
                     }
-#line 8792 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8791 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 97: /* mlhs_node: primary_value '[' opt_call_args ']'  */
-#line 3453 "mrbgems/mruby-compiler/core/parse.y"
+#line 3452 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-3].nd), intern_op(aref), (yyvsp[-1].nd), '.');
                     }
-#line 8800 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8799 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 98: /* mlhs_node: primary_value call_op "local variable or method"  */
-#line 3457 "mrbgems/mruby-compiler/core/parse.y"
+#line 3456 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-2].nd), (yyvsp[0].id), 0, (yyvsp[-1].num));
                     }
-#line 8808 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8807 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 99: /* mlhs_node: primary_value "::" "local variable or method"  */
-#line 3461 "mrbgems/mruby-compiler/core/parse.y"
+#line 3460 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-2].nd), (yyvsp[0].id), 0, tCOLON2);
                     }
-#line 8816 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8815 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 100: /* mlhs_node: primary_value call_op "constant"  */
-#line 3465 "mrbgems/mruby-compiler/core/parse.y"
+#line 3464 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-2].nd), (yyvsp[0].id), 0, (yyvsp[-1].num));
                     }
-#line 8824 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8823 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 101: /* mlhs_node: primary_value "::" "constant"  */
-#line 3469 "mrbgems/mruby-compiler/core/parse.y"
+#line 3468 "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 8834 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8833 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 102: /* mlhs_node: tCOLON3 "constant"  */
-#line 3475 "mrbgems/mruby-compiler/core/parse.y"
+#line 3474 "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 8844 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8843 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 103: /* mlhs_node: backref  */
-#line 3481 "mrbgems/mruby-compiler/core/parse.y"
+#line 3480 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       backref_error(p, (yyvsp[0].nd));
                       (yyval.nd) = 0;
                     }
-#line 8853 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8852 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 104: /* lhs: variable  */
-#line 3488 "mrbgems/mruby-compiler/core/parse.y"
+#line 3487 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       assignable(p, (yyvsp[0].nd));
                     }
-#line 8861 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8860 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 105: /* lhs: primary_value '[' opt_call_args ']'  */
-#line 3492 "mrbgems/mruby-compiler/core/parse.y"
+#line 3491 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-3].nd), intern_op(aref), (yyvsp[-1].nd), '.');
                     }
-#line 8869 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8868 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 106: /* lhs: primary_value call_op "local variable or method"  */
-#line 3496 "mrbgems/mruby-compiler/core/parse.y"
+#line 3495 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-2].nd), (yyvsp[0].id), 0, (yyvsp[-1].num));
                     }
-#line 8877 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8876 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 107: /* lhs: primary_value "::" "local variable or method"  */
-#line 3500 "mrbgems/mruby-compiler/core/parse.y"
+#line 3499 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-2].nd), (yyvsp[0].id), 0, tCOLON2);
                     }
-#line 8885 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8884 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 108: /* lhs: primary_value call_op "constant"  */
-#line 3504 "mrbgems/mruby-compiler/core/parse.y"
+#line 3503 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-2].nd), (yyvsp[0].id), 0, (yyvsp[-1].num));
                     }
-#line 8893 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8892 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 109: /* lhs: primary_value "::" "constant"  */
-#line 3508 "mrbgems/mruby-compiler/core/parse.y"
+#line 3507 "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 8903 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8902 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 110: /* lhs: tCOLON3 "constant"  */
-#line 3514 "mrbgems/mruby-compiler/core/parse.y"
+#line 3513 "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 8913 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8912 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 111: /* lhs: backref  */
-#line 3520 "mrbgems/mruby-compiler/core/parse.y"
+#line 3519 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       backref_error(p, (yyvsp[0].nd));
                       (yyval.nd) = 0;
                     }
-#line 8922 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8921 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 112: /* lhs: "numbered parameter"  */
-#line 3525 "mrbgems/mruby-compiler/core/parse.y"
+#line 3524 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       yyerror(&(yylsp[0]), p, "can't assign to numbered parameter");
                     }
-#line 8930 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8929 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 113: /* cname: "local variable or method"  */
-#line 3531 "mrbgems/mruby-compiler/core/parse.y"
+#line 3530 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       yyerror(&(yylsp[0]), p, "class/module name must be CONSTANT");
                     }
-#line 8938 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8937 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 115: /* cpath: tCOLON3 cname  */
-#line 3538 "mrbgems/mruby-compiler/core/parse.y"
+#line 3537 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = cons(int_to_node(1), sym_to_node((yyvsp[0].id)));
                     }
-#line 8946 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8945 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 116: /* cpath: cname  */
-#line 3542 "mrbgems/mruby-compiler/core/parse.y"
+#line 3541 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = cons(int_to_node(0), sym_to_node((yyvsp[0].id)));
                     }
-#line 8954 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8953 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 117: /* cpath: primary_value "::" cname  */
-#line 3546 "mrbgems/mruby-compiler/core/parse.y"
+#line 3545 "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 8963 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8962 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 121: /* fname: op  */
-#line 3556 "mrbgems/mruby-compiler/core/parse.y"
+#line 3555 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       p->lstate = EXPR_ENDFN;
                       (yyval.id) = (yyvsp[0].id);
                     }
-#line 8972 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8971 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 122: /* fname: reswords  */
-#line 3561 "mrbgems/mruby-compiler/core/parse.y"
+#line 3560 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       p->lstate = EXPR_ENDFN;
                       (yyval.id) = (yyvsp[0].id);
                     }
-#line 8981 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8980 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 125: /* undef_list: fsym  */
-#line 3572 "mrbgems/mruby-compiler/core/parse.y"
+#line 3571 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = cons(sym_to_node((yyvsp[0].id)), 0);
                     }
-#line 8989 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8988 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 126: /* $@6: %empty  */
-#line 3575 "mrbgems/mruby-compiler/core/parse.y"
+#line 3574 "mrbgems/mruby-compiler/core/parse.y"
                                  {p->lstate = EXPR_FNAME;}
-#line 8995 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8994 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 127: /* undef_list: undef_list ',' $@6 fsym  */
-#line 3576 "mrbgems/mruby-compiler/core/parse.y"
+#line 3575 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push((yyvsp[-3].nd), sym_to_node((yyvsp[0].id)));
                     }
-#line 9003 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9002 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 128: /* op: '|'  */
-#line 3581 "mrbgems/mruby-compiler/core/parse.y"
+#line 3580 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(or);     }
-#line 9009 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9008 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 129: /* op: '^'  */
-#line 3582 "mrbgems/mruby-compiler/core/parse.y"
+#line 3581 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(xor);    }
-#line 9015 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9014 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 130: /* op: '&'  */
-#line 3583 "mrbgems/mruby-compiler/core/parse.y"
+#line 3582 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(and);    }
-#line 9021 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9020 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 131: /* op: "<=>"  */
-#line 3584 "mrbgems/mruby-compiler/core/parse.y"
+#line 3583 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(cmp);    }
-#line 9027 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9026 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 132: /* op: "=="  */
-#line 3585 "mrbgems/mruby-compiler/core/parse.y"
+#line 3584 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(eq);     }
-#line 9033 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9032 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 133: /* op: "==="  */
-#line 3586 "mrbgems/mruby-compiler/core/parse.y"
+#line 3585 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(eqq);    }
-#line 9039 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9038 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 134: /* op: "=~"  */
-#line 3587 "mrbgems/mruby-compiler/core/parse.y"
+#line 3586 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(match);  }
-#line 9045 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9044 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 135: /* op: "!~"  */
-#line 3588 "mrbgems/mruby-compiler/core/parse.y"
+#line 3587 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(nmatch); }
-#line 9051 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9050 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 136: /* op: '>'  */
-#line 3589 "mrbgems/mruby-compiler/core/parse.y"
+#line 3588 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(gt);     }
-#line 9057 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9056 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 137: /* op: ">="  */
-#line 3590 "mrbgems/mruby-compiler/core/parse.y"
+#line 3589 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(ge);     }
-#line 9063 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9062 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 138: /* op: '<'  */
-#line 3591 "mrbgems/mruby-compiler/core/parse.y"
+#line 3590 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(lt);     }
-#line 9069 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9068 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 139: /* op: "<="  */
-#line 3592 "mrbgems/mruby-compiler/core/parse.y"
+#line 3591 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(le);     }
-#line 9075 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9074 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 140: /* op: "!="  */
-#line 3593 "mrbgems/mruby-compiler/core/parse.y"
+#line 3592 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(neq);    }
-#line 9081 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9080 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 141: /* op: "<<"  */
-#line 3594 "mrbgems/mruby-compiler/core/parse.y"
+#line 3593 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(lshift); }
-#line 9087 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9086 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 142: /* op: ">>"  */
-#line 3595 "mrbgems/mruby-compiler/core/parse.y"
+#line 3594 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(rshift); }
-#line 9093 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9092 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 143: /* op: '+'  */
-#line 3596 "mrbgems/mruby-compiler/core/parse.y"
+#line 3595 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(add);    }
-#line 9099 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9098 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 144: /* op: '-'  */
-#line 3597 "mrbgems/mruby-compiler/core/parse.y"
+#line 3596 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(sub);    }
-#line 9105 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9104 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 145: /* op: '*'  */
-#line 3598 "mrbgems/mruby-compiler/core/parse.y"
+#line 3597 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(mul);    }
-#line 9111 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9110 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 146: /* op: "*"  */
-#line 3599 "mrbgems/mruby-compiler/core/parse.y"
+#line 3598 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(mul);    }
-#line 9117 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9116 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 147: /* op: '/'  */
-#line 3600 "mrbgems/mruby-compiler/core/parse.y"
+#line 3599 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(div);    }
-#line 9123 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9122 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 148: /* op: '%'  */
-#line 3601 "mrbgems/mruby-compiler/core/parse.y"
+#line 3600 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(mod);    }
-#line 9129 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9128 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 149: /* op: tPOW  */
-#line 3602 "mrbgems/mruby-compiler/core/parse.y"
+#line 3601 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(pow);    }
-#line 9135 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9134 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 150: /* op: "**"  */
-#line 3603 "mrbgems/mruby-compiler/core/parse.y"
+#line 3602 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(pow);    }
-#line 9141 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9140 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 151: /* op: '!'  */
-#line 3604 "mrbgems/mruby-compiler/core/parse.y"
+#line 3603 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(not);    }
-#line 9147 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9146 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 152: /* op: '~'  */
-#line 3605 "mrbgems/mruby-compiler/core/parse.y"
+#line 3604 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(neg);    }
-#line 9153 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9152 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 153: /* op: "unary plus"  */
-#line 3606 "mrbgems/mruby-compiler/core/parse.y"
+#line 3605 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(plus);   }
-#line 9159 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9158 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 154: /* op: "unary minus"  */
-#line 3607 "mrbgems/mruby-compiler/core/parse.y"
+#line 3606 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(minus);  }
-#line 9165 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9164 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 155: /* op: tAREF  */
-#line 3608 "mrbgems/mruby-compiler/core/parse.y"
+#line 3607 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(aref);   }
-#line 9171 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9170 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 156: /* op: tASET  */
-#line 3609 "mrbgems/mruby-compiler/core/parse.y"
+#line 3608 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(aset);   }
-#line 9177 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9176 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 157: /* op: '`'  */
-#line 3610 "mrbgems/mruby-compiler/core/parse.y"
+#line 3609 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(tick);   }
-#line 9183 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9182 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 198: /* arg: lhs '=' arg_rhs  */
-#line 3628 "mrbgems/mruby-compiler/core/parse.y"
+#line 3627 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_asgn(p, (yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 9191 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9190 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 199: /* arg: var_lhs tOP_ASGN arg_rhs  */
-#line 3632 "mrbgems/mruby-compiler/core/parse.y"
+#line 3631 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_op_asgn(p, (yyvsp[-2].nd), (yyvsp[-1].id), (yyvsp[0].nd));
                     }
-#line 9199 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9198 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 200: /* arg: primary_value '[' opt_call_args ']' tOP_ASGN arg_rhs  */
-#line 3636 "mrbgems/mruby-compiler/core/parse.y"
+#line 3635 "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 9207 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9206 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 201: /* arg: primary_value call_op "local variable or method" tOP_ASGN arg_rhs  */
-#line 3640 "mrbgems/mruby-compiler/core/parse.y"
+#line 3639 "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 9215 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9214 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 202: /* arg: primary_value call_op "constant" tOP_ASGN arg_rhs  */
-#line 3644 "mrbgems/mruby-compiler/core/parse.y"
+#line 3643 "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 9223 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9222 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 203: /* arg: primary_value "::" "local variable or method" tOP_ASGN arg_rhs  */
-#line 3648 "mrbgems/mruby-compiler/core/parse.y"
+#line 3647 "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 9231 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9230 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 204: /* arg: primary_value "::" "constant" tOP_ASGN arg_rhs  */
-#line 3652 "mrbgems/mruby-compiler/core/parse.y"
+#line 3651 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       yyerror(&(yylsp[-4]), p, "constant re-assignment");
                       (yyval.nd) = new_stmts(p, 0);
                     }
-#line 9240 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9239 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 205: /* arg: tCOLON3 "constant" tOP_ASGN arg_rhs  */
-#line 3657 "mrbgems/mruby-compiler/core/parse.y"
+#line 3656 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       yyerror(&(yylsp[-3]), p, "constant re-assignment");
                       (yyval.nd) = new_stmts(p, 0);
                     }
-#line 9249 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9248 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 206: /* arg: backref tOP_ASGN arg_rhs  */
-#line 3662 "mrbgems/mruby-compiler/core/parse.y"
+#line 3661 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       backref_error(p, (yyvsp[-2].nd));
                       (yyval.nd) = new_stmts(p, 0);
                     }
-#line 9258 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9257 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 207: /* arg: arg ".." arg  */
-#line 3667 "mrbgems/mruby-compiler/core/parse.y"
+#line 3666 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_dot2(p, (yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 9266 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9265 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 208: /* arg: arg ".."  */
-#line 3671 "mrbgems/mruby-compiler/core/parse.y"
+#line 3670 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_dot2(p, (yyvsp[-1].nd), new_nil(p));
                     }
-#line 9274 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9273 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 209: /* arg: tBDOT2 arg  */
-#line 3675 "mrbgems/mruby-compiler/core/parse.y"
+#line 3674 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_dot2(p, new_nil(p), (yyvsp[0].nd));
                     }
-#line 9282 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9281 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 210: /* arg: arg "..." arg  */
-#line 3679 "mrbgems/mruby-compiler/core/parse.y"
+#line 3678 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_dot3(p, (yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 9290 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9289 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 211: /* arg: arg "..."  */
-#line 3683 "mrbgems/mruby-compiler/core/parse.y"
+#line 3682 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_dot3(p, (yyvsp[-1].nd), new_nil(p));
                     }
-#line 9298 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9297 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 212: /* arg: tBDOT3 arg  */
-#line 3687 "mrbgems/mruby-compiler/core/parse.y"
+#line 3686 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_dot3(p, new_nil(p), (yyvsp[0].nd));
                     }
-#line 9306 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9305 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 213: /* arg: arg '+' arg  */
-#line 3691 "mrbgems/mruby-compiler/core/parse.y"
+#line 3690 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "+", (yyvsp[0].nd));
                     }
-#line 9314 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9313 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 214: /* arg: arg '-' arg  */
-#line 3695 "mrbgems/mruby-compiler/core/parse.y"
+#line 3694 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "-", (yyvsp[0].nd));
                     }
-#line 9322 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9321 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 215: /* arg: arg '*' arg  */
-#line 3699 "mrbgems/mruby-compiler/core/parse.y"
+#line 3698 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "*", (yyvsp[0].nd));
                     }
-#line 9330 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9329 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 216: /* arg: arg '/' arg  */
-#line 3703 "mrbgems/mruby-compiler/core/parse.y"
+#line 3702 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "/", (yyvsp[0].nd));
                     }
-#line 9338 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9337 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 217: /* arg: arg '%' arg  */
-#line 3707 "mrbgems/mruby-compiler/core/parse.y"
+#line 3706 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "%", (yyvsp[0].nd));
                     }
-#line 9346 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9345 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 218: /* arg: arg tPOW arg  */
-#line 3711 "mrbgems/mruby-compiler/core/parse.y"
+#line 3710 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "**", (yyvsp[0].nd));
                     }
-#line 9354 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9353 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 219: /* arg: tUMINUS_NUM "integer literal" tPOW arg  */
-#line 3715 "mrbgems/mruby-compiler/core/parse.y"
+#line 3714 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_negate(p, call_bin_op(p, (yyvsp[-2].nd), "**", (yyvsp[0].nd)));
                     }
-#line 9362 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9361 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 220: /* arg: tUMINUS_NUM "float literal" tPOW arg  */
-#line 3719 "mrbgems/mruby-compiler/core/parse.y"
+#line 3718 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_negate(p, call_bin_op(p, (yyvsp[-2].nd), "**", (yyvsp[0].nd)));
                     }
-#line 9370 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9369 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 221: /* arg: "unary plus" arg  */
-#line 3723 "mrbgems/mruby-compiler/core/parse.y"
+#line 3722 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_uni_op(p, (yyvsp[0].nd), "+@");
                     }
-#line 9378 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9377 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 222: /* arg: "unary minus" arg  */
-#line 3727 "mrbgems/mruby-compiler/core/parse.y"
+#line 3726 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_negate(p, (yyvsp[0].nd));
                     }
-#line 9386 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9385 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 223: /* arg: arg '|' arg  */
-#line 3731 "mrbgems/mruby-compiler/core/parse.y"
+#line 3730 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "|", (yyvsp[0].nd));
                     }
-#line 9394 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9393 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 224: /* arg: arg '^' arg  */
-#line 3735 "mrbgems/mruby-compiler/core/parse.y"
+#line 3734 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "^", (yyvsp[0].nd));
                     }
-#line 9402 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9401 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 225: /* arg: arg '&' arg  */
-#line 3739 "mrbgems/mruby-compiler/core/parse.y"
+#line 3738 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "&", (yyvsp[0].nd));
                     }
-#line 9410 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9409 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 226: /* arg: arg "<=>" arg  */
-#line 3743 "mrbgems/mruby-compiler/core/parse.y"
+#line 3742 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "<=>", (yyvsp[0].nd));
                     }
-#line 9418 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9417 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 227: /* arg: arg '>' arg  */
-#line 3747 "mrbgems/mruby-compiler/core/parse.y"
+#line 3746 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), ">", (yyvsp[0].nd));
                     }
-#line 9426 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9425 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 228: /* arg: arg ">=" arg  */
-#line 3751 "mrbgems/mruby-compiler/core/parse.y"
+#line 3750 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), ">=", (yyvsp[0].nd));
                     }
-#line 9434 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9433 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 229: /* arg: arg '<' arg  */
-#line 3755 "mrbgems/mruby-compiler/core/parse.y"
+#line 3754 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "<", (yyvsp[0].nd));
                     }
-#line 9442 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9441 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 230: /* arg: arg "<=" arg  */
-#line 3759 "mrbgems/mruby-compiler/core/parse.y"
+#line 3758 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "<=", (yyvsp[0].nd));
                     }
-#line 9450 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9449 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 231: /* arg: arg "==" arg  */
-#line 3763 "mrbgems/mruby-compiler/core/parse.y"
+#line 3762 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "==", (yyvsp[0].nd));
                     }
-#line 9458 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9457 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 232: /* arg: arg "===" arg  */
-#line 3767 "mrbgems/mruby-compiler/core/parse.y"
+#line 3766 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "===", (yyvsp[0].nd));
                     }
-#line 9466 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9465 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 233: /* arg: arg "!=" arg  */
-#line 3771 "mrbgems/mruby-compiler/core/parse.y"
+#line 3770 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "!=", (yyvsp[0].nd));
                     }
-#line 9474 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9473 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 234: /* arg: arg "=~" arg  */
-#line 3775 "mrbgems/mruby-compiler/core/parse.y"
+#line 3774 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "=~", (yyvsp[0].nd));
                     }
-#line 9482 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9481 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 235: /* arg: arg "!~" arg  */
-#line 3779 "mrbgems/mruby-compiler/core/parse.y"
+#line 3778 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "!~", (yyvsp[0].nd));
                     }
-#line 9490 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9489 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 236: /* arg: '!' arg  */
-#line 3783 "mrbgems/mruby-compiler/core/parse.y"
+#line 3782 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_uni_op(p, cond((yyvsp[0].nd)), "!");
                     }
-#line 9498 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9497 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 237: /* arg: '~' arg  */
-#line 3787 "mrbgems/mruby-compiler/core/parse.y"
+#line 3786 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_uni_op(p, cond((yyvsp[0].nd)), "~");
                     }
-#line 9506 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9505 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 238: /* arg: arg "<<" arg  */
-#line 3791 "mrbgems/mruby-compiler/core/parse.y"
+#line 3790 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "<<", (yyvsp[0].nd));
                     }
-#line 9514 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9513 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 239: /* arg: arg ">>" arg  */
-#line 3795 "mrbgems/mruby-compiler/core/parse.y"
+#line 3794 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), ">>", (yyvsp[0].nd));
                     }
-#line 9522 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9521 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 240: /* arg: arg "&&" arg  */
-#line 3799 "mrbgems/mruby-compiler/core/parse.y"
+#line 3798 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_and(p, (yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 9530 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9529 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 241: /* arg: arg "||" arg  */
-#line 3803 "mrbgems/mruby-compiler/core/parse.y"
+#line 3802 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_or(p, (yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 9538 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9537 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 242: /* arg: arg '?' arg opt_nl ':' arg  */
-#line 3807 "mrbgems/mruby-compiler/core/parse.y"
+#line 3806 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_if(p, cond((yyvsp[-5].nd)), (yyvsp[-3].nd), (yyvsp[0].nd));
                     }
-#line 9546 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9545 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 243: /* arg: arg '?' arg opt_nl "label" arg  */
-#line 3811 "mrbgems/mruby-compiler/core/parse.y"
+#line 3810 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_if(p, cond((yyvsp[-5].nd)), (yyvsp[-3].nd), (yyvsp[0].nd));
                     }
-#line 9554 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9553 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 244: /* arg: defn_head f_opt_arglist_paren '=' arg  */
-#line 3815 "mrbgems/mruby-compiler/core/parse.y"
+#line 3814 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-3].nd);
                       endless_method_name(p, (yyvsp[-3].nd));
@@ -9563,11 +9562,11 @@ yyreduce:
                       nvars_unnest(p);
                       p->in_def--;
                     }
-#line 9567 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9566 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 245: /* arg: defn_head f_opt_arglist_paren '=' arg "'rescue' modifier" arg  */
-#line 3824 "mrbgems/mruby-compiler/core/parse.y"
+#line 3823 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-5].nd);
                       endless_method_name(p, (yyvsp[-5].nd));
@@ -9576,11 +9575,11 @@ yyreduce:
                       nvars_unnest(p);
                       p->in_def--;
                     }
-#line 9580 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9579 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 246: /* arg: defs_head f_opt_arglist_paren '=' arg  */
-#line 3833 "mrbgems/mruby-compiler/core/parse.y"
+#line 3832 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-3].nd);
                       void_expr_error(p, (yyvsp[0].nd));
@@ -9589,11 +9588,11 @@ yyreduce:
                       p->in_def--;
                       p->in_single--;
                     }
-#line 9593 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9592 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 247: /* arg: defs_head f_opt_arglist_paren '=' arg "'rescue' modifier" arg  */
-#line 3842 "mrbgems/mruby-compiler/core/parse.y"
+#line 3841 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-5].nd);
                       void_expr_error(p, (yyvsp[-2].nd));
@@ -9602,68 +9601,68 @@ yyreduce:
                       p->in_def--;
                       p->in_single--;
                     }
-#line 9606 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9605 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 248: /* arg: primary  */
-#line 3851 "mrbgems/mruby-compiler/core/parse.y"
+#line 3850 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[0].nd);
                     }
-#line 9614 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9613 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 250: /* aref_args: args trailer  */
-#line 3858 "mrbgems/mruby-compiler/core/parse.y"
+#line 3857 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-1].nd);
                     }
-#line 9622 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9621 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 251: /* aref_args: args comma assocs trailer  */
-#line 3862 "mrbgems/mruby-compiler/core/parse.y"
+#line 3861 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push((yyvsp[-3].nd), new_hash(p, (yyvsp[-1].nd)));
                     }
-#line 9630 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9629 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 252: /* aref_args: assocs trailer  */
-#line 3866 "mrbgems/mruby-compiler/core/parse.y"
+#line 3865 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = cons(new_kw_hash(p, (yyvsp[-1].nd)), 0);
                     }
-#line 9638 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9637 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 253: /* arg_rhs: arg  */
-#line 3872 "mrbgems/mruby-compiler/core/parse.y"
+#line 3871 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[0].nd);
                     }
-#line 9646 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9645 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 254: /* arg_rhs: arg "'rescue' modifier" arg  */
-#line 3876 "mrbgems/mruby-compiler/core/parse.y"
+#line 3875 "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 9655 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9654 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 255: /* paren_args: '(' opt_call_args ')'  */
-#line 3883 "mrbgems/mruby-compiler/core/parse.y"
+#line 3882 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-1].nd);
                     }
-#line 9663 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9662 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 256: /* paren_args: '(' args comma tBDOT3 rparen  */
-#line 3887 "mrbgems/mruby-compiler/core/parse.y"
+#line 3886 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       mrb_sym r = intern_op(mul);
                       mrb_sym k = intern_op(pow);
@@ -9672,11 +9671,11 @@ 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 9676 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9675 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 257: /* paren_args: '(' tBDOT3 rparen  */
-#line 3896 "mrbgems/mruby-compiler/core/parse.y"
+#line 3895 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       mrb_sym r = intern_op(mul);
                       mrb_sym k = intern_op(pow);
@@ -9691,374 +9690,374 @@ yyreduce:
                         (yyval.nd) = 0;
                       }
                     }
-#line 9695 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9694 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 262: /* opt_call_args: args comma  */
-#line 3919 "mrbgems/mruby-compiler/core/parse.y"
+#line 3918 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_callargs(p,(yyvsp[-1].nd),0,0);
                     }
-#line 9703 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9702 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 263: /* opt_call_args: args comma assocs comma  */
-#line 3923 "mrbgems/mruby-compiler/core/parse.y"
+#line 3922 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_callargs(p,(yyvsp[-3].nd),new_kw_hash(p,(yyvsp[-1].nd)),0);
                     }
-#line 9711 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9710 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 264: /* opt_call_args: assocs comma  */
-#line 3927 "mrbgems/mruby-compiler/core/parse.y"
+#line 3926 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_callargs(p,0,new_kw_hash(p,(yyvsp[-1].nd)),0);
                     }
-#line 9719 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9718 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 265: /* call_args: command  */
-#line 3933 "mrbgems/mruby-compiler/core/parse.y"
+#line 3932 "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 9728 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9727 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 266: /* call_args: args opt_block_arg  */
-#line 3938 "mrbgems/mruby-compiler/core/parse.y"
+#line 3937 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_callargs(p, (yyvsp[-1].nd), 0, (yyvsp[0].nd));
                     }
-#line 9736 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9735 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 267: /* call_args: assocs opt_block_arg  */
-#line 3942 "mrbgems/mruby-compiler/core/parse.y"
+#line 3941 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_callargs(p, 0, new_kw_hash(p, (yyvsp[-1].nd)), (yyvsp[0].nd));
                     }
-#line 9744 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9743 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 268: /* call_args: args comma assocs opt_block_arg  */
-#line 3946 "mrbgems/mruby-compiler/core/parse.y"
+#line 3945 "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 9752 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9751 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 269: /* call_args: block_arg  */
-#line 3950 "mrbgems/mruby-compiler/core/parse.y"
+#line 3949 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_callargs(p, 0, 0, (yyvsp[0].nd));
                     }
-#line 9760 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9759 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 270: /* @7: %empty  */
-#line 3955 "mrbgems/mruby-compiler/core/parse.y"
+#line 3954 "mrbgems/mruby-compiler/core/parse.y"
                    {
                       (yyval.stack) = p->cmdarg_stack;
                       CMDARG_PUSH(1);
                     }
-#line 9769 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9768 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 271: /* command_args: @7 call_args  */
-#line 3960 "mrbgems/mruby-compiler/core/parse.y"
+#line 3959 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       p->cmdarg_stack = (yyvsp[-1].stack);
                       (yyval.nd) = (yyvsp[0].nd);
                     }
-#line 9778 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9777 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 272: /* block_arg: "&" arg  */
-#line 3967 "mrbgems/mruby-compiler/core/parse.y"
+#line 3966 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_block_arg(p, (yyvsp[0].nd));
                     }
-#line 9786 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9785 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 273: /* block_arg: "&"  */
-#line 3971 "mrbgems/mruby-compiler/core/parse.y"
+#line 3970 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_block_arg(p, 0);
                     }
-#line 9794 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9793 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 274: /* opt_block_arg: comma block_arg  */
-#line 3977 "mrbgems/mruby-compiler/core/parse.y"
+#line 3976 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[0].nd);
                     }
-#line 9802 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9801 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 275: /* opt_block_arg: none  */
-#line 3981 "mrbgems/mruby-compiler/core/parse.y"
+#line 3980 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = 0;
                     }
-#line 9810 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9809 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 277: /* args: arg  */
-#line 3990 "mrbgems/mruby-compiler/core/parse.y"
+#line 3989 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       void_expr_error(p, (yyvsp[0].nd));
                       (yyval.nd) = list1((yyvsp[0].nd));
                     }
-#line 9819 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9818 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 278: /* args: "*"  */
-#line 3995 "mrbgems/mruby-compiler/core/parse.y"
+#line 3994 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1(new_splat(p, new_lvar(p, intern_op(mul))));
                     }
-#line 9827 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9826 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 279: /* args: "*" arg  */
-#line 3999 "mrbgems/mruby-compiler/core/parse.y"
+#line 3998 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1(new_splat(p, (yyvsp[0].nd)));
                     }
-#line 9835 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9834 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 280: /* args: args comma arg  */
-#line 4003 "mrbgems/mruby-compiler/core/parse.y"
+#line 4002 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       void_expr_error(p, (yyvsp[0].nd));
                       (yyval.nd) = push((yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 9844 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9843 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 281: /* args: args comma "*"  */
-#line 4008 "mrbgems/mruby-compiler/core/parse.y"
+#line 4007 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push((yyvsp[-2].nd), new_splat(p, new_lvar(p, intern_op(mul))));
                     }
-#line 9852 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9851 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 282: /* args: args comma "*" arg  */
-#line 4012 "mrbgems/mruby-compiler/core/parse.y"
+#line 4011 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push((yyvsp[-3].nd), new_splat(p, (yyvsp[0].nd)));
                     }
-#line 9860 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9859 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 283: /* mrhs: args comma arg  */
-#line 4018 "mrbgems/mruby-compiler/core/parse.y"
+#line 4017 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       void_expr_error(p, (yyvsp[0].nd));
                       (yyval.nd) = push((yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 9869 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9868 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 284: /* mrhs: args comma "*" arg  */
-#line 4023 "mrbgems/mruby-compiler/core/parse.y"
+#line 4022 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push((yyvsp[-3].nd), new_splat(p, (yyvsp[0].nd)));
                     }
-#line 9877 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9876 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 285: /* mrhs: "*" arg  */
-#line 4027 "mrbgems/mruby-compiler/core/parse.y"
+#line 4026 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1(new_splat(p, (yyvsp[0].nd)));
                     }
-#line 9885 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9884 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 293: /* primary: "method"  */
-#line 4040 "mrbgems/mruby-compiler/core/parse.y"
+#line 4039 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_fcall(p, (yyvsp[0].id), 0);
                     }
-#line 9893 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9892 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 294: /* @8: %empty  */
-#line 4044 "mrbgems/mruby-compiler/core/parse.y"
+#line 4043 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.stack) = p->cmdarg_stack;
                       p->cmdarg_stack = 0;
                     }
-#line 9902 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9901 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 295: /* primary: "'begin'" @8 bodystmt "'end'"  */
-#line 4050 "mrbgems/mruby-compiler/core/parse.y"
+#line 4049 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       p->cmdarg_stack = (yyvsp[-2].stack);
                       (yyval.nd) = new_begin(p, (yyvsp[-1].nd));
                     }
-#line 9911 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9910 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 296: /* @9: %empty  */
-#line 4055 "mrbgems/mruby-compiler/core/parse.y"
+#line 4054 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.stack) = p->cmdarg_stack;
                       p->cmdarg_stack = 0;
                     }
-#line 9920 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9919 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 297: /* $@10: %empty  */
-#line 4059 "mrbgems/mruby-compiler/core/parse.y"
+#line 4058 "mrbgems/mruby-compiler/core/parse.y"
                        {p->lstate = EXPR_ENDARG;}
-#line 9926 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9925 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 298: /* primary: "(" @9 stmt $@10 rparen  */
-#line 4060 "mrbgems/mruby-compiler/core/parse.y"
+#line 4059 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       p->cmdarg_stack = (yyvsp[-3].stack);
                       (yyval.nd) = (yyvsp[-2].nd);
                     }
-#line 9935 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9934 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 299: /* $@11: %empty  */
-#line 4064 "mrbgems/mruby-compiler/core/parse.y"
+#line 4063 "mrbgems/mruby-compiler/core/parse.y"
                               {p->lstate = EXPR_ENDARG;}
-#line 9941 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9940 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 300: /* primary: "(" $@11 rparen  */
-#line 4065 "mrbgems/mruby-compiler/core/parse.y"
+#line 4064 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_nil(p);
                     }
-#line 9949 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9948 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 301: /* primary: tLPAREN compstmt ')'  */
-#line 4069 "mrbgems/mruby-compiler/core/parse.y"
+#line 4068 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-1].nd);
                     }
-#line 9957 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9956 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 302: /* primary: primary_value "::" "constant"  */
-#line 4073 "mrbgems/mruby-compiler/core/parse.y"
+#line 4072 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_colon2(p, (yyvsp[-2].nd), (yyvsp[0].id));
                     }
-#line 9965 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9964 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 303: /* primary: tCOLON3 "constant"  */
-#line 4077 "mrbgems/mruby-compiler/core/parse.y"
+#line 4076 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_colon3(p, (yyvsp[0].id));
                     }
-#line 9973 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9972 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 304: /* primary: "[" aref_args ']'  */
-#line 4081 "mrbgems/mruby-compiler/core/parse.y"
+#line 4080 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_array(p, (yyvsp[-1].nd));
                     }
-#line 9981 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9980 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 305: /* primary: tLBRACE assoc_list '}'  */
-#line 4085 "mrbgems/mruby-compiler/core/parse.y"
+#line 4084 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_hash(p, (yyvsp[-1].nd));
                     }
-#line 9989 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9988 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 306: /* primary: "'return'"  */
-#line 4089 "mrbgems/mruby-compiler/core/parse.y"
+#line 4088 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_return(p, 0);
                     }
-#line 9997 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9996 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 307: /* primary: "'yield'" opt_paren_args  */
-#line 4093 "mrbgems/mruby-compiler/core/parse.y"
+#line 4092 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_yield(p, (yyvsp[0].nd));
                     }
-#line 10005 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10004 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 308: /* primary: "'not'" '(' expr rparen  */
-#line 4097 "mrbgems/mruby-compiler/core/parse.y"
+#line 4096 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_uni_op(p, cond((yyvsp[-1].nd)), "!");
                     }
-#line 10013 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10012 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 309: /* primary: "'not'" '(' rparen  */
-#line 4101 "mrbgems/mruby-compiler/core/parse.y"
+#line 4100 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_uni_op(p, new_nil(p), "!");
                     }
-#line 10021 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10020 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 310: /* primary: operation brace_block  */
-#line 4105 "mrbgems/mruby-compiler/core/parse.y"
+#line 4104 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_fcall(p, (yyvsp[-1].id), new_callargs(p, 0, 0, (yyvsp[0].nd)));
                     }
-#line 10029 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10028 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 312: /* primary: method_call brace_block  */
-#line 4110 "mrbgems/mruby-compiler/core/parse.y"
+#line 4109 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       call_with_block(p, (yyvsp[-1].nd), (yyvsp[0].nd));
                       (yyval.nd) = (yyvsp[-1].nd);
                     }
-#line 10038 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10037 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 313: /* @12: %empty  */
-#line 4115 "mrbgems/mruby-compiler/core/parse.y"
+#line 4114 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       local_nest(p);
                       nvars_nest(p);
                       (yyval.num) = p->lpar_beg;
                       p->lpar_beg = ++p->paren_nest;
                     }
-#line 10049 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10048 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 314: /* @13: %empty  */
-#line 4122 "mrbgems/mruby-compiler/core/parse.y"
+#line 4121 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.stack) = p->cmdarg_stack;
                       p->cmdarg_stack = 0;
                     }
-#line 10058 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10057 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 315: /* primary: "->" @12 f_larglist @13 lambda_body  */
-#line 4127 "mrbgems/mruby-compiler/core/parse.y"
+#line 4126 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       p->lpar_beg = (yyvsp[-3].num);
                       (yyval.nd) = new_lambda(p, (yyvsp[-2].nd), (yyvsp[0].nd));
@@ -10067,149 +10066,149 @@ yyreduce:
                       p->cmdarg_stack = (yyvsp[-1].stack);
                       CMDARG_LEXPOP();
                     }
-#line 10071 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10070 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 316: /* primary: "'if'" expr_value then compstmt if_tail "'end'"  */
-#line 4139 "mrbgems/mruby-compiler/core/parse.y"
+#line 4138 "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 10080 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10079 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 317: /* primary: "'unless'" expr_value then compstmt opt_else "'end'"  */
-#line 4147 "mrbgems/mruby-compiler/core/parse.y"
+#line 4146 "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 10089 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10088 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 318: /* $@14: %empty  */
-#line 4151 "mrbgems/mruby-compiler/core/parse.y"
+#line 4150 "mrbgems/mruby-compiler/core/parse.y"
                                 {COND_PUSH(1);}
-#line 10095 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10094 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 319: /* $@15: %empty  */
-#line 4151 "mrbgems/mruby-compiler/core/parse.y"
+#line 4150 "mrbgems/mruby-compiler/core/parse.y"
                                                               {COND_POP();}
-#line 10101 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10100 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 320: /* primary: "'while'" $@14 expr_value do $@15 compstmt "'end'"  */
-#line 4154 "mrbgems/mruby-compiler/core/parse.y"
+#line 4153 "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 10110 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10109 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 321: /* $@16: %empty  */
-#line 4158 "mrbgems/mruby-compiler/core/parse.y"
+#line 4157 "mrbgems/mruby-compiler/core/parse.y"
                                 {COND_PUSH(1);}
-#line 10116 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10115 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 322: /* $@17: %empty  */
-#line 4158 "mrbgems/mruby-compiler/core/parse.y"
+#line 4157 "mrbgems/mruby-compiler/core/parse.y"
                                                               {COND_POP();}
-#line 10122 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10121 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 323: /* primary: "'until'" $@16 expr_value do $@17 compstmt "'end'"  */
-#line 4161 "mrbgems/mruby-compiler/core/parse.y"
+#line 4160 "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 10131 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10130 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 324: /* primary: "'case'" expr_value opt_terms case_body "'end'"  */
-#line 4168 "mrbgems/mruby-compiler/core/parse.y"
+#line 4167 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_case(p, (yyvsp[-3].nd), (yyvsp[-1].nd));
                     }
-#line 10139 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10138 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 325: /* primary: "'case'" opt_terms case_body "'end'"  */
-#line 4172 "mrbgems/mruby-compiler/core/parse.y"
+#line 4171 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_case(p, 0, (yyvsp[-1].nd));
                     }
-#line 10147 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10146 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 326: /* $@18: %empty  */
-#line 4176 "mrbgems/mruby-compiler/core/parse.y"
+#line 4175 "mrbgems/mruby-compiler/core/parse.y"
                   {COND_PUSH(1);}
-#line 10153 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10152 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 327: /* $@19: %empty  */
-#line 4178 "mrbgems/mruby-compiler/core/parse.y"
+#line 4177 "mrbgems/mruby-compiler/core/parse.y"
                   {COND_POP();}
-#line 10159 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10158 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 328: /* primary: "'for'" for_var "'in'" $@18 expr_value do $@19 compstmt "'end'"  */
-#line 4181 "mrbgems/mruby-compiler/core/parse.y"
+#line 4180 "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 10168 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10167 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 329: /* @20: %empty  */
-#line 4187 "mrbgems/mruby-compiler/core/parse.y"
+#line 4186 "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 10179 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10178 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 330: /* primary: "'class'" cpath superclass @20 bodystmt "'end'"  */
-#line 4195 "mrbgems/mruby-compiler/core/parse.y"
+#line 4194 "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 10190 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10189 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 331: /* @21: %empty  */
-#line 4203 "mrbgems/mruby-compiler/core/parse.y"
+#line 4202 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.num) = p->in_def;
                       p->in_def = 0;
                     }
-#line 10199 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10198 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 332: /* @22: %empty  */
-#line 4208 "mrbgems/mruby-compiler/core/parse.y"
+#line 4207 "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 10209 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10208 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 333: /* primary: "'class'" "<<" expr @21 term @22 bodystmt "'end'"  */
-#line 4215 "mrbgems/mruby-compiler/core/parse.y"
+#line 4214 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_sclass(p, (yyvsp[-5].nd), (yyvsp[-1].nd));
                       SET_LINENO((yyval.nd), (yyvsp[-7].num));
@@ -10218,44 +10217,44 @@ yyreduce:
                       p->in_def = (yyvsp[-4].num);
                       p->in_single = node_to_int((yyvsp[-2].nd)->cdr);
                     }
-#line 10222 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10221 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 334: /* @23: %empty  */
-#line 4225 "mrbgems/mruby-compiler/core/parse.y"
+#line 4224 "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 10233 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10232 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 335: /* primary: "'module'" cpath @23 bodystmt "'end'"  */
-#line 4233 "mrbgems/mruby-compiler/core/parse.y"
+#line 4232 "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 10244 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10243 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 336: /* primary: defn_head f_arglist bodystmt "'end'"  */
-#line 4243 "mrbgems/mruby-compiler/core/parse.y"
+#line 4242 "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 10255 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10254 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 337: /* primary: defs_head f_arglist bodystmt "'end'"  */
-#line 4253 "mrbgems/mruby-compiler/core/parse.y"
+#line 4252 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-3].nd);
                       defs_setup(p, (yyval.nd), (yyvsp[-2].nd), (yyvsp[-1].nd));
@@ -10263,453 +10262,453 @@ yyreduce:
                       p->in_def--;
                       p->in_single--;
                     }
-#line 10267 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10266 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 338: /* primary: "'break'"  */
-#line 4261 "mrbgems/mruby-compiler/core/parse.y"
+#line 4260 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_break(p, 0);
                     }
-#line 10275 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10274 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 339: /* primary: "'next'"  */
-#line 4265 "mrbgems/mruby-compiler/core/parse.y"
+#line 4264 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_next(p, 0);
                     }
-#line 10283 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10282 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 340: /* primary: "'redo'"  */
-#line 4269 "mrbgems/mruby-compiler/core/parse.y"
+#line 4268 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_redo(p);
                     }
-#line 10291 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10290 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 341: /* primary: "'retry'"  */
-#line 4273 "mrbgems/mruby-compiler/core/parse.y"
+#line 4272 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_retry(p);
                     }
-#line 10299 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10298 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 342: /* primary_value: primary  */
-#line 4279 "mrbgems/mruby-compiler/core/parse.y"
+#line 4278 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[0].nd);
                       if (!(yyval.nd)) (yyval.nd) = new_nil(p);
                     }
-#line 10308 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10307 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 349: /* if_tail: "'elsif'" expr_value then compstmt if_tail  */
-#line 4298 "mrbgems/mruby-compiler/core/parse.y"
+#line 4297 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_if(p, cond((yyvsp[-3].nd)), (yyvsp[-1].nd), (yyvsp[0].nd));
                     }
-#line 10316 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10315 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 351: /* opt_else: "'else'" compstmt  */
-#line 4305 "mrbgems/mruby-compiler/core/parse.y"
+#line 4304 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[0].nd);
                     }
-#line 10324 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10323 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 352: /* for_var: lhs  */
-#line 4311 "mrbgems/mruby-compiler/core/parse.y"
+#line 4310 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1(list1((yyvsp[0].nd)));
                     }
-#line 10332 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10331 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 354: /* f_margs: f_arg  */
-#line 4318 "mrbgems/mruby-compiler/core/parse.y"
+#line 4317 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list3((yyvsp[0].nd),0,0);
                     }
-#line 10340 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10339 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 355: /* f_margs: f_arg ',' "*" f_norm_arg  */
-#line 4322 "mrbgems/mruby-compiler/core/parse.y"
+#line 4321 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list3((yyvsp[-3].nd), new_arg(p, (yyvsp[0].id)), 0);
                     }
-#line 10348 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10347 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 356: /* f_margs: f_arg ',' "*" f_norm_arg ',' f_arg  */
-#line 4326 "mrbgems/mruby-compiler/core/parse.y"
+#line 4325 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list3((yyvsp[-5].nd), new_arg(p, (yyvsp[-2].id)), (yyvsp[0].nd));
                     }
-#line 10356 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10355 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 357: /* f_margs: f_arg ',' "*"  */
-#line 4330 "mrbgems/mruby-compiler/core/parse.y"
+#line 4329 "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 10365 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10364 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 358: /* f_margs: f_arg ',' "*" ',' f_arg  */
-#line 4335 "mrbgems/mruby-compiler/core/parse.y"
+#line 4334 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list3((yyvsp[-4].nd), int_to_node(-1), (yyvsp[0].nd));
                     }
-#line 10373 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10372 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 359: /* f_margs: "*" f_norm_arg  */
-#line 4339 "mrbgems/mruby-compiler/core/parse.y"
+#line 4338 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list3(0, new_arg(p, (yyvsp[0].id)), 0);
                     }
-#line 10381 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10380 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 360: /* f_margs: "*" f_norm_arg ',' f_arg  */
-#line 4343 "mrbgems/mruby-compiler/core/parse.y"
+#line 4342 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list3(0, new_arg(p, (yyvsp[-2].id)), (yyvsp[0].nd));
                     }
-#line 10389 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10388 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 361: /* f_margs: "*"  */
-#line 4347 "mrbgems/mruby-compiler/core/parse.y"
+#line 4346 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       local_add_f(p, intern_op(mul));
                       (yyval.nd) = list3(0, int_to_node(-1), 0);
                     }
-#line 10398 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10397 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 362: /* $@24: %empty  */
-#line 4352 "mrbgems/mruby-compiler/core/parse.y"
+#line 4351 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       local_add_f(p, intern_op(mul));
                     }
-#line 10406 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10405 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 363: /* f_margs: "*" ',' $@24 f_arg  */
-#line 4356 "mrbgems/mruby-compiler/core/parse.y"
+#line 4355 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list3(0, int_to_node(-1), (yyvsp[0].nd));
                     }
-#line 10414 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10413 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 364: /* block_args_tail: f_block_kwarg ',' f_kwrest opt_f_block_arg  */
-#line 4362 "mrbgems/mruby-compiler/core/parse.y"
+#line 4361 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args_tail(p, (yyvsp[-3].nd), (yyvsp[-1].nd), (yyvsp[0].id));
                     }
-#line 10422 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10421 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 365: /* block_args_tail: f_block_kwarg opt_f_block_arg  */
-#line 4366 "mrbgems/mruby-compiler/core/parse.y"
+#line 4365 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args_tail(p, (yyvsp[-1].nd), 0, (yyvsp[0].id));
                     }
-#line 10430 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10429 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 366: /* block_args_tail: f_kwrest opt_f_block_arg  */
-#line 4370 "mrbgems/mruby-compiler/core/parse.y"
+#line 4369 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args_tail(p, 0, (yyvsp[-1].nd), (yyvsp[0].id));
                     }
-#line 10438 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10437 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 367: /* block_args_tail: f_block_arg  */
-#line 4374 "mrbgems/mruby-compiler/core/parse.y"
+#line 4373 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args_tail(p, 0, 0, (yyvsp[0].id));
                     }
-#line 10446 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10445 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 368: /* opt_block_args_tail: ',' block_args_tail  */
-#line 4380 "mrbgems/mruby-compiler/core/parse.y"
+#line 4379 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[0].nd);
                     }
-#line 10454 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10453 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 369: /* opt_block_args_tail: %empty  */
-#line 4384 "mrbgems/mruby-compiler/core/parse.y"
+#line 4383 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args_tail(p, 0, 0, 0);
                     }
-#line 10462 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10461 "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 4390 "mrbgems/mruby-compiler/core/parse.y"
+#line 4389 "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 10470 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10469 "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 4394 "mrbgems/mruby-compiler/core/parse.y"
+#line 4393 "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 10478 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10477 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 372: /* block_param: f_arg ',' f_block_optarg opt_block_args_tail  */
-#line 4398 "mrbgems/mruby-compiler/core/parse.y"
+#line 4397 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, (yyvsp[-3].nd), (yyvsp[-1].nd), 0, 0, (yyvsp[0].nd));
                     }
-#line 10486 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10485 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 373: /* block_param: f_arg ',' f_block_optarg ',' f_arg opt_block_args_tail  */
-#line 4402 "mrbgems/mruby-compiler/core/parse.y"
+#line 4401 "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 10494 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10493 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 374: /* block_param: f_arg ',' f_rest_arg opt_block_args_tail  */
-#line 4406 "mrbgems/mruby-compiler/core/parse.y"
+#line 4405 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, (yyvsp[-3].nd), 0, (yyvsp[-1].id), 0, (yyvsp[0].nd));
                     }
-#line 10502 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10501 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 375: /* block_param: f_arg ',' opt_block_args_tail  */
-#line 4410 "mrbgems/mruby-compiler/core/parse.y"
+#line 4409 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, (yyvsp[-2].nd), 0, 0, 0, (yyvsp[0].nd));
                     }
-#line 10510 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10509 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 376: /* block_param: f_arg ',' f_rest_arg ',' f_arg opt_block_args_tail  */
-#line 4414 "mrbgems/mruby-compiler/core/parse.y"
+#line 4413 "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 10518 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10517 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 377: /* block_param: f_arg opt_block_args_tail  */
-#line 4418 "mrbgems/mruby-compiler/core/parse.y"
+#line 4417 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, (yyvsp[-1].nd), 0, 0, 0, (yyvsp[0].nd));
                     }
-#line 10526 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10525 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 378: /* block_param: f_block_optarg ',' f_rest_arg opt_block_args_tail  */
-#line 4422 "mrbgems/mruby-compiler/core/parse.y"
+#line 4421 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, 0, (yyvsp[-3].nd), (yyvsp[-1].id), 0, (yyvsp[0].nd));
                     }
-#line 10534 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10533 "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 4426 "mrbgems/mruby-compiler/core/parse.y"
+#line 4425 "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 10542 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10541 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 380: /* block_param: f_block_optarg opt_block_args_tail  */
-#line 4430 "mrbgems/mruby-compiler/core/parse.y"
+#line 4429 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, 0, (yyvsp[-1].nd), 0, 0, (yyvsp[0].nd));
                     }
-#line 10550 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10549 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 381: /* block_param: f_block_optarg ',' f_arg opt_block_args_tail  */
-#line 4434 "mrbgems/mruby-compiler/core/parse.y"
+#line 4433 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, 0, (yyvsp[-3].nd), 0, (yyvsp[-1].nd), (yyvsp[0].nd));
                     }
-#line 10558 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10557 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 382: /* block_param: f_rest_arg opt_block_args_tail  */
-#line 4438 "mrbgems/mruby-compiler/core/parse.y"
+#line 4437 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, 0, 0, (yyvsp[-1].id), 0, (yyvsp[0].nd));
                     }
-#line 10566 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10565 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 383: /* block_param: f_rest_arg ',' f_arg opt_block_args_tail  */
-#line 4442 "mrbgems/mruby-compiler/core/parse.y"
+#line 4441 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, 0, 0, (yyvsp[-3].id), (yyvsp[-1].nd), (yyvsp[0].nd));
                     }
-#line 10574 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10573 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 384: /* block_param: block_args_tail  */
-#line 4446 "mrbgems/mruby-compiler/core/parse.y"
+#line 4445 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, 0, 0, 0, 0, (yyvsp[0].nd));
                     }
-#line 10582 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10581 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 385: /* opt_block_param: none  */
-#line 4452 "mrbgems/mruby-compiler/core/parse.y"
+#line 4451 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       local_add_blk(p);
                       (yyval.nd) = 0;
                     }
-#line 10591 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10590 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 386: /* opt_block_param: block_param_def  */
-#line 4457 "mrbgems/mruby-compiler/core/parse.y"
+#line 4456 "mrbgems/mruby-compiler/core/parse.y"
                    {
                       p->cmd_start = TRUE;
                       (yyval.nd) = (yyvsp[0].nd);
                     }
-#line 10600 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10599 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 387: /* $@25: %empty  */
-#line 4463 "mrbgems/mruby-compiler/core/parse.y"
+#line 4462 "mrbgems/mruby-compiler/core/parse.y"
                       {local_add_blk(p);}
-#line 10606 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10605 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 388: /* block_param_def: '|' $@25 opt_bv_decl '|'  */
-#line 4464 "mrbgems/mruby-compiler/core/parse.y"
+#line 4463 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = 0;
                     }
-#line 10614 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10613 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 389: /* block_param_def: "||"  */
-#line 4468 "mrbgems/mruby-compiler/core/parse.y"
+#line 4467 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       local_add_blk(p);
                       (yyval.nd) = 0;
                     }
-#line 10623 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10622 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 390: /* block_param_def: '|' block_param opt_bv_decl '|'  */
-#line 4473 "mrbgems/mruby-compiler/core/parse.y"
+#line 4472 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-2].nd);
                     }
-#line 10631 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10630 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 391: /* opt_bv_decl: opt_nl  */
-#line 4480 "mrbgems/mruby-compiler/core/parse.y"
+#line 4479 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = 0;
                     }
-#line 10639 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10638 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 392: /* opt_bv_decl: opt_nl ';' bv_decls opt_nl  */
-#line 4484 "mrbgems/mruby-compiler/core/parse.y"
+#line 4483 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = 0;
                     }
-#line 10647 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10646 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 395: /* bvar: "local variable or method"  */
-#line 4494 "mrbgems/mruby-compiler/core/parse.y"
+#line 4493 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       local_add_f(p, (yyvsp[0].id));
                       new_bv(p, (yyvsp[0].id));
                     }
-#line 10656 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10655 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 397: /* f_larglist: '(' f_args opt_bv_decl ')'  */
-#line 4502 "mrbgems/mruby-compiler/core/parse.y"
+#line 4501 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-2].nd);
                     }
-#line 10664 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10663 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 398: /* f_larglist: f_args  */
-#line 4506 "mrbgems/mruby-compiler/core/parse.y"
+#line 4505 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[0].nd);
                     }
-#line 10672 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10671 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 399: /* lambda_body: tLAMBEG compstmt '}'  */
-#line 4512 "mrbgems/mruby-compiler/core/parse.y"
+#line 4511 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-1].nd);
                     }
-#line 10680 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10679 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 400: /* lambda_body: "'do' for lambda" bodystmt "'end'"  */
-#line 4516 "mrbgems/mruby-compiler/core/parse.y"
+#line 4515 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-1].nd);
                     }
-#line 10688 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10687 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 401: /* @26: %empty  */
-#line 4522 "mrbgems/mruby-compiler/core/parse.y"
+#line 4521 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       local_nest(p);
                       nvars_nest(p);
                       (yyval.num) = p->lineno;
                     }
-#line 10698 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10697 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 402: /* do_block: "'do' for block" @26 opt_block_param bodystmt "'end'"  */
-#line 4530 "mrbgems/mruby-compiler/core/parse.y"
+#line 4529 "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 10709 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10708 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 403: /* block_call: command do_block  */
-#line 4539 "mrbgems/mruby-compiler/core/parse.y"
+#line 4538 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       if (node_to_type((yyvsp[-1].nd)->car) == NODE_YIELD) {
                         yyerror(&(yylsp[-1]), p, "block given to yield");
@@ -10719,159 +10718,159 @@ yyreduce:
                       }
                       (yyval.nd) = (yyvsp[-1].nd);
                     }
-#line 10723 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10722 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 404: /* block_call: block_call call_op2 operation2 opt_paren_args  */
-#line 4549 "mrbgems/mruby-compiler/core/parse.y"
+#line 4548 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-3].nd), (yyvsp[-1].id), (yyvsp[0].nd), (yyvsp[-2].num));
                     }
-#line 10731 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10730 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 405: /* block_call: block_call call_op2 operation2 opt_paren_args brace_block  */
-#line 4553 "mrbgems/mruby-compiler/core/parse.y"
+#line 4552 "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 10740 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10739 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 406: /* block_call: block_call call_op2 operation2 command_args do_block  */
-#line 4558 "mrbgems/mruby-compiler/core/parse.y"
+#line 4557 "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 10749 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10748 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 407: /* method_call: operation paren_args  */
-#line 4565 "mrbgems/mruby-compiler/core/parse.y"
+#line 4564 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_fcall(p, (yyvsp[-1].id), (yyvsp[0].nd));
                     }
-#line 10757 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10756 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 408: /* method_call: primary_value call_op operation2 opt_paren_args  */
-#line 4569 "mrbgems/mruby-compiler/core/parse.y"
+#line 4568 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-3].nd), (yyvsp[-1].id), (yyvsp[0].nd), (yyvsp[-2].num));
                     }
-#line 10765 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10764 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 409: /* method_call: primary_value "::" operation2 paren_args  */
-#line 4573 "mrbgems/mruby-compiler/core/parse.y"
+#line 4572 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-3].nd), (yyvsp[-1].id), (yyvsp[0].nd), tCOLON2);
                     }
-#line 10773 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10772 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 410: /* method_call: primary_value "::" operation3  */
-#line 4577 "mrbgems/mruby-compiler/core/parse.y"
+#line 4576 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-2].nd), (yyvsp[0].id), 0, tCOLON2);
                     }
-#line 10781 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10780 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 411: /* method_call: primary_value call_op paren_args  */
-#line 4581 "mrbgems/mruby-compiler/core/parse.y"
+#line 4580 "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 10789 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10788 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 412: /* method_call: primary_value "::" paren_args  */
-#line 4585 "mrbgems/mruby-compiler/core/parse.y"
+#line 4584 "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 10797 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10796 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 413: /* method_call: "'super'" paren_args  */
-#line 4589 "mrbgems/mruby-compiler/core/parse.y"
+#line 4588 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_super(p, (yyvsp[0].nd));
                     }
-#line 10805 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10804 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 414: /* method_call: "'super'"  */
-#line 4593 "mrbgems/mruby-compiler/core/parse.y"
+#line 4592 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_zsuper(p);
                     }
-#line 10813 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10812 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 415: /* method_call: primary_value '[' opt_call_args ']'  */
-#line 4597 "mrbgems/mruby-compiler/core/parse.y"
+#line 4596 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-3].nd), intern_op(aref), (yyvsp[-1].nd), '.');
                     }
-#line 10821 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10820 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 416: /* @27: %empty  */
-#line 4603 "mrbgems/mruby-compiler/core/parse.y"
+#line 4602 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       local_nest(p);
                       nvars_nest(p);
                       (yyval.num) = p->lineno;
                     }
-#line 10831 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10830 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 417: /* brace_block: '{' @27 opt_block_param compstmt '}'  */
-#line 4610 "mrbgems/mruby-compiler/core/parse.y"
+#line 4609 "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 10842 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10841 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 418: /* @28: %empty  */
-#line 4617 "mrbgems/mruby-compiler/core/parse.y"
+#line 4616 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       local_nest(p);
                       nvars_nest(p);
                       (yyval.num) = p->lineno;
                     }
-#line 10852 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10851 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 419: /* brace_block: "'do'" @28 opt_block_param bodystmt "'end'"  */
-#line 4624 "mrbgems/mruby-compiler/core/parse.y"
+#line 4623 "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 10863 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10862 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 420: /* case_body: "'when'" args then compstmt cases  */
-#line 4635 "mrbgems/mruby-compiler/core/parse.y"
+#line 4634 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = cons(cons((yyvsp[-3].nd), (yyvsp[-1].nd)), (yyvsp[0].nd));
                     }
-#line 10871 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10870 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 421: /* cases: opt_else  */
-#line 4641 "mrbgems/mruby-compiler/core/parse.y"
+#line 4640 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       if ((yyvsp[0].nd)) {
                         (yyval.nd) = cons(cons(0, (yyvsp[0].nd)), 0);
@@ -10880,60 +10879,63 @@ yyreduce:
                         (yyval.nd) = 0;
                       }
                     }
-#line 10884 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10883 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 423: /* opt_rescue: "'rescue'" exc_list exc_var then compstmt opt_rescue  */
-#line 4655 "mrbgems/mruby-compiler/core/parse.y"
+#line 4654 "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 10893 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10892 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 425: /* exc_list: arg  */
-#line 4663 "mrbgems/mruby-compiler/core/parse.y"
+#line 4662 "mrbgems/mruby-compiler/core/parse.y"
                     {
                         (yyval.nd) = list1((yyvsp[0].nd));
                     }
-#line 10901 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10900 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 428: /* exc_var: "=>" lhs  */
-#line 4671 "mrbgems/mruby-compiler/core/parse.y"
+#line 4670 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[0].nd);
                     }
-#line 10909 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10908 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 430: /* opt_ensure: "'ensure'" compstmt  */
-#line 4678 "mrbgems/mruby-compiler/core/parse.y"
+#line 4677 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[0].nd);
                     }
-#line 10917 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10916 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 437: /* string: string string_fragment  */
-#line 4692 "mrbgems/mruby-compiler/core/parse.y"
+#line 4691 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = concat_string(p, (yyvsp[-1].nd), (yyvsp[0].nd));
                     }
-#line 10925 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10924 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 440: /* string_fragment: "string literal" tSTRING  */
-#line 4700 "mrbgems/mruby-compiler/core/parse.y"
+#line 4699 "mrbgems/mruby-compiler/core/parse.y"
                     {
-                      (yyval.nd) = (yyvsp[0].nd);
+                      node *data = (yyvsp[0].nd)->cdr;  /* (string . length) */
+                      const char *string = (const char*)data->car;
+                      size_t len = (size_t)node_to_int(data->cdr);
+                      (yyval.nd) = new_str(p, string, len);
                     }
-#line 10933 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10935 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 441: /* string_fragment: "string literal" string_rep tSTRING  */
-#line 4704 "mrbgems/mruby-compiler/core/parse.y"
+#line 4706 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       node *n = (yyvsp[-1].nd);
                       if (node_to_int((yyvsp[0].nd)->cdr->cdr) > 0) {
@@ -10944,68 +10946,68 @@ yyreduce:
                       }
                       (yyval.nd) = new_dstr(p, n);
                     }
-#line 10948 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10950 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 443: /* string_rep: string_rep string_interp  */
-#line 4718 "mrbgems/mruby-compiler/core/parse.y"
+#line 4720 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = append((yyvsp[-1].nd), (yyvsp[0].nd));
                     }
-#line 10956 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10958 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 444: /* string_interp: tSTRING_MID  */
-#line 4724 "mrbgems/mruby-compiler/core/parse.y"
+#line 4726 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1((yyvsp[0].nd));
                     }
-#line 10964 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10966 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 445: /* @29: %empty  */
-#line 4728 "mrbgems/mruby-compiler/core/parse.y"
+#line 4730 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push_strterm(p);
                     }
-#line 10972 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10974 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 446: /* string_interp: tSTRING_PART @29 compstmt '}'  */
-#line 4733 "mrbgems/mruby-compiler/core/parse.y"
+#line 4735 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       pop_strterm(p,(yyvsp[-2].nd));
                       (yyval.nd) = list2((yyvsp[-3].nd), (yyvsp[-1].nd));
                     }
-#line 10981 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10983 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 447: /* string_interp: tLITERAL_DELIM  */
-#line 4738 "mrbgems/mruby-compiler/core/parse.y"
+#line 4740 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1(new_literal_delim(p));
                     }
-#line 10989 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10991 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 448: /* string_interp: tHD_LITERAL_DELIM heredoc_bodies  */
-#line 4742 "mrbgems/mruby-compiler/core/parse.y"
+#line 4744 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1(new_literal_delim(p));
                     }
-#line 10997 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10999 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 449: /* xstring: tXSTRING_BEG tXSTRING  */
-#line 4748 "mrbgems/mruby-compiler/core/parse.y"
+#line 4750 "mrbgems/mruby-compiler/core/parse.y"
                     {
                         (yyval.nd) = (yyvsp[0].nd);
                     }
-#line 11005 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11007 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 450: /* xstring: tXSTRING_BEG string_rep tXSTRING  */
-#line 4752 "mrbgems/mruby-compiler/core/parse.y"
+#line 4754 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       node *n = (yyvsp[-1].nd);
                       if (node_to_int((yyvsp[0].nd)->cdr->cdr) > 0) {
@@ -11016,81 +11018,85 @@ yyreduce:
                       }
                       (yyval.nd) = new_dxstr(p, n);
                     }
-#line 11020 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11022 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 451: /* regexp: tREGEXP_BEG tREGEXP  */
-#line 4765 "mrbgems/mruby-compiler/core/parse.y"
+#line 4767 "mrbgems/mruby-compiler/core/parse.y"
                     {
-                        (yyval.nd) = (yyvsp[0].nd);
+                      node *data = (yyvsp[0].nd)->cdr;  /* (pattern . (flags . encoding)) */
+                      const char *pattern = (const char*)data->car;
+                      const char *flags = (const char*)data->cdr->car;
+                      const char *encoding = (const char*)data->cdr->cdr;
+                      (yyval.nd) = new_regx(p, pattern, flags, encoding);
                     }
-#line 11028 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11034 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 452: /* regexp: tREGEXP_BEG string_rep tREGEXP  */
-#line 4769 "mrbgems/mruby-compiler/core/parse.y"
+#line 4775 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_dregx(p, (yyvsp[-1].nd), (yyvsp[0].nd));
                     }
-#line 11036 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11042 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 456: /* heredoc_body: tHEREDOC_END  */
-#line 4782 "mrbgems/mruby-compiler/core/parse.y"
+#line 4788 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       parser_heredoc_info *info = parsing_heredoc_info(p);
                       info->doc = push(info->doc, new_str(p, "", 0));
                       heredoc_end(p);
                     }
-#line 11046 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11052 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 457: /* heredoc_body: heredoc_string_rep tHEREDOC_END  */
-#line 4788 "mrbgems/mruby-compiler/core/parse.y"
+#line 4794 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       heredoc_end(p);
                     }
-#line 11054 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11060 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 460: /* heredoc_string_interp: tHD_STRING_MID  */
-#line 4798 "mrbgems/mruby-compiler/core/parse.y"
+#line 4804 "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 11064 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11070 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 461: /* @30: %empty  */
-#line 4804 "mrbgems/mruby-compiler/core/parse.y"
+#line 4810 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push_strterm(p);
                     }
-#line 11072 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11078 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 462: /* heredoc_string_interp: tHD_STRING_PART @30 compstmt '}'  */
-#line 4809 "mrbgems/mruby-compiler/core/parse.y"
+#line 4815 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       pop_strterm(p, (yyvsp[-2].nd));
                       parser_heredoc_info *info = parsing_heredoc_info(p);
                       info->doc = push(push(info->doc, (yyvsp[-3].nd)), (yyvsp[-1].nd));
                     }
-#line 11082 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11088 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 463: /* words: tWORDS_BEG tSTRING  */
-#line 4817 "mrbgems/mruby-compiler/core/parse.y"
+#line 4823 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_words(p, list1((yyvsp[0].nd)));
                     }
-#line 11090 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11096 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 464: /* words: tWORDS_BEG string_rep tSTRING  */
-#line 4821 "mrbgems/mruby-compiler/core/parse.y"
+#line 4827 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       node *n = (yyvsp[-1].nd);
                       if (node_to_int((yyvsp[0].nd)->cdr->cdr) > 0) {
@@ -11101,19 +11107,19 @@ yyreduce:
                       }
                       (yyval.nd) = new_words(p, n);
                     }
-#line 11105 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11111 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 465: /* symbol: basic_symbol  */
-#line 4835 "mrbgems/mruby-compiler/core/parse.y"
+#line 4841 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_sym(p, (yyvsp[0].id));
                     }
-#line 11113 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11119 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 466: /* symbol: "symbol" "string literal" string_rep tSTRING  */
-#line 4839 "mrbgems/mruby-compiler/core/parse.y"
+#line 4845 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       node *n = (yyvsp[-1].nd);
                       p->lstate = EXPR_ENDARG;
@@ -11125,53 +11131,53 @@ yyreduce:
                       }
                       (yyval.nd) = new_dsym(p, new_dstr(p, n));
                     }
-#line 11129 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11135 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 467: /* symbol: "symbol" "numbered parameter"  */
-#line 4851 "mrbgems/mruby-compiler/core/parse.y"
+#line 4857 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       mrb_sym sym = intern_numparam((yyvsp[0].num));
                       (yyval.nd) = new_sym(p, sym);
                     }
-#line 11138 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11144 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 468: /* basic_symbol: "symbol" sym  */
-#line 4858 "mrbgems/mruby-compiler/core/parse.y"
+#line 4864 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       p->lstate = EXPR_END;
                       (yyval.id) = (yyvsp[0].id);
                     }
-#line 11147 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11153 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 473: /* sym: tSTRING  */
-#line 4869 "mrbgems/mruby-compiler/core/parse.y"
+#line 4875 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.id) = new_strsym(p, (yyvsp[0].nd));
                     }
-#line 11155 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11161 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 474: /* sym: "string literal" tSTRING  */
-#line 4873 "mrbgems/mruby-compiler/core/parse.y"
+#line 4879 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.id) = new_strsym(p, (yyvsp[0].nd));
                     }
-#line 11163 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11169 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 475: /* symbols: tSYMBOLS_BEG tSTRING  */
-#line 4879 "mrbgems/mruby-compiler/core/parse.y"
+#line 4885 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_symbols(p, list1((yyvsp[0].nd)));
                     }
-#line 11171 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11177 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 476: /* symbols: tSYMBOLS_BEG string_rep tSTRING  */
-#line 4883 "mrbgems/mruby-compiler/core/parse.y"
+#line 4889 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       node *n = (yyvsp[-1].nd);
                       if (node_to_int((yyvsp[0].nd)->cdr->cdr) > 0) {
@@ -11179,131 +11185,131 @@ yyreduce:
                       }
                       (yyval.nd) = new_symbols(p, n);
                     }
-#line 11183 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11189 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 479: /* numeric: tUMINUS_NUM "integer literal"  */
-#line 4895 "mrbgems/mruby-compiler/core/parse.y"
+#line 4901 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_negate(p, (yyvsp[0].nd));
                     }
-#line 11191 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11197 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 480: /* numeric: tUMINUS_NUM "float literal"  */
-#line 4899 "mrbgems/mruby-compiler/core/parse.y"
+#line 4905 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_negate(p, (yyvsp[0].nd));
                     }
-#line 11199 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11205 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 481: /* variable: "local variable or method"  */
-#line 4905 "mrbgems/mruby-compiler/core/parse.y"
+#line 4911 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_lvar(p, (yyvsp[0].id));
                     }
-#line 11207 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11213 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 482: /* variable: "instance variable"  */
-#line 4909 "mrbgems/mruby-compiler/core/parse.y"
+#line 4915 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_ivar(p, (yyvsp[0].id));
                     }
-#line 11215 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11221 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 483: /* variable: "global variable"  */
-#line 4913 "mrbgems/mruby-compiler/core/parse.y"
+#line 4919 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_gvar(p, (yyvsp[0].id));
                     }
-#line 11223 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11229 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 484: /* variable: "class variable"  */
-#line 4917 "mrbgems/mruby-compiler/core/parse.y"
+#line 4923 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_cvar(p, (yyvsp[0].id));
                     }
-#line 11231 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11237 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 485: /* variable: "constant"  */
-#line 4921 "mrbgems/mruby-compiler/core/parse.y"
+#line 4927 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_const(p, (yyvsp[0].id));
                     }
-#line 11239 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11245 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 486: /* var_lhs: variable  */
-#line 4927 "mrbgems/mruby-compiler/core/parse.y"
+#line 4933 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       assignable(p, (yyvsp[0].nd));
                     }
-#line 11247 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11253 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 487: /* var_lhs: "numbered parameter"  */
-#line 4931 "mrbgems/mruby-compiler/core/parse.y"
+#line 4937 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       yyerror(&(yylsp[0]), p, "can't assign to numbered parameter");
                     }
-#line 11255 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11261 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 488: /* var_ref: variable  */
-#line 4937 "mrbgems/mruby-compiler/core/parse.y"
+#line 4943 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = var_reference(p, (yyvsp[0].nd));
                     }
-#line 11263 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11269 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 489: /* var_ref: "numbered parameter"  */
-#line 4941 "mrbgems/mruby-compiler/core/parse.y"
+#line 4947 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_nvar(p, (yyvsp[0].num));
                     }
-#line 11271 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11277 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 490: /* var_ref: "'nil'"  */
-#line 4945 "mrbgems/mruby-compiler/core/parse.y"
+#line 4951 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_nil(p);
                     }
-#line 11279 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11285 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 491: /* var_ref: "'self'"  */
-#line 4949 "mrbgems/mruby-compiler/core/parse.y"
+#line 4955 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_self(p);
                     }
-#line 11287 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11293 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 492: /* var_ref: "'true'"  */
-#line 4953 "mrbgems/mruby-compiler/core/parse.y"
+#line 4959 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_true(p);
                     }
-#line 11295 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11301 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 493: /* var_ref: "'false'"  */
-#line 4957 "mrbgems/mruby-compiler/core/parse.y"
+#line 4963 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_false(p);
                     }
-#line 11303 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11309 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 494: /* var_ref: "'__FILE__'"  */
-#line 4961 "mrbgems/mruby-compiler/core/parse.y"
+#line 4967 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       const char *fn = mrb_sym_name_len(p->mrb, p->filename_sym, NULL);
                       if (!fn) {
@@ -11311,686 +11317,686 @@ yyreduce:
                       }
                       (yyval.nd) = new_str(p, fn, strlen(fn));
                     }
-#line 11315 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11321 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 495: /* var_ref: "'__LINE__'"  */
-#line 4969 "mrbgems/mruby-compiler/core/parse.y"
+#line 4975 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       char buf[16];
 
                       dump_int(p->lineno, buf);
                       (yyval.nd) = new_int(p, buf, 10, 0);
                     }
-#line 11326 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11332 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 496: /* var_ref: "'__ENCODING__'"  */
-#line 4976 "mrbgems/mruby-compiler/core/parse.y"
+#line 4982 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_fcall(p, MRB_SYM_2(p->mrb, __ENCODING__), 0);
                     }
-#line 11334 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11340 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 499: /* superclass: %empty  */
-#line 4986 "mrbgems/mruby-compiler/core/parse.y"
+#line 4992 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = 0;
                     }
-#line 11342 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11348 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 500: /* $@31: %empty  */
-#line 4990 "mrbgems/mruby-compiler/core/parse.y"
+#line 4996 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       p->lstate = EXPR_BEG;
                       p->cmd_start = TRUE;
                     }
-#line 11351 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11357 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 501: /* superclass: '<' $@31 expr_value term  */
-#line 4995 "mrbgems/mruby-compiler/core/parse.y"
+#line 5001 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-1].nd);
                     }
-#line 11359 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11365 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 504: /* f_arglist_paren: '(' f_args rparen  */
-#line 5011 "mrbgems/mruby-compiler/core/parse.y"
+#line 5017 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-1].nd);
                       p->lstate = EXPR_BEG;
                       p->cmd_start = TRUE;
                     }
-#line 11369 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11375 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 505: /* f_arglist_paren: '(' f_arg ',' tBDOT3 rparen  */
-#line 5017 "mrbgems/mruby-compiler/core/parse.y"
+#line 5023 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args_dots(p, (yyvsp[-3].nd));
                     }
-#line 11377 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11383 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 506: /* f_arglist_paren: '(' tBDOT3 rparen  */
-#line 5021 "mrbgems/mruby-compiler/core/parse.y"
+#line 5027 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args_dots(p, 0);
                     }
-#line 11385 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11391 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 508: /* f_arglist: f_args term  */
-#line 5028 "mrbgems/mruby-compiler/core/parse.y"
+#line 5034 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-1].nd);
                     }
-#line 11393 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11399 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 509: /* f_arglist: f_arg ',' tBDOT3 term  */
-#line 5032 "mrbgems/mruby-compiler/core/parse.y"
+#line 5038 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args_dots(p, (yyvsp[-3].nd));
                     }
-#line 11401 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11407 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 510: /* f_arglist: "..." term  */
-#line 5036 "mrbgems/mruby-compiler/core/parse.y"
+#line 5042 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args_dots(p, 0);
                     }
-#line 11409 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11415 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 511: /* f_label: "local variable or method" "label"  */
-#line 5042 "mrbgems/mruby-compiler/core/parse.y"
+#line 5048 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       local_nest(p);
                     }
-#line 11417 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11423 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 512: /* f_label: "numbered parameter" "label"  */
-#line 5046 "mrbgems/mruby-compiler/core/parse.y"
+#line 5052 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       local_nest(p);
                     }
-#line 11425 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11431 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 513: /* f_kw: f_label arg  */
-#line 5052 "mrbgems/mruby-compiler/core/parse.y"
+#line 5058 "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 11435 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11441 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 514: /* f_kw: f_label  */
-#line 5058 "mrbgems/mruby-compiler/core/parse.y"
+#line 5064 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_kw_arg(p, (yyvsp[0].id), 0);
                       local_unnest(p);
                     }
-#line 11444 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11450 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 515: /* f_block_kw: f_label primary_value  */
-#line 5065 "mrbgems/mruby-compiler/core/parse.y"
+#line 5071 "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 11454 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11460 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 516: /* f_block_kw: f_label  */
-#line 5071 "mrbgems/mruby-compiler/core/parse.y"
+#line 5077 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_kw_arg(p, (yyvsp[0].id), 0);
                       local_unnest(p);
                     }
-#line 11463 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11469 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 517: /* f_block_kwarg: f_block_kw  */
-#line 5078 "mrbgems/mruby-compiler/core/parse.y"
+#line 5084 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1((yyvsp[0].nd));
                     }
-#line 11471 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11477 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 518: /* f_block_kwarg: f_block_kwarg ',' f_block_kw  */
-#line 5082 "mrbgems/mruby-compiler/core/parse.y"
+#line 5088 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push((yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 11479 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11485 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 519: /* f_kwarg: f_kw  */
-#line 5088 "mrbgems/mruby-compiler/core/parse.y"
+#line 5094 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1((yyvsp[0].nd));
                     }
-#line 11487 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11493 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 520: /* f_kwarg: f_kwarg ',' f_kw  */
-#line 5092 "mrbgems/mruby-compiler/core/parse.y"
+#line 5098 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push((yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 11495 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11501 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 523: /* f_kwrest: kwrest_mark "local variable or method"  */
-#line 5102 "mrbgems/mruby-compiler/core/parse.y"
+#line 5108 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_kw_rest_args(p, (yyvsp[0].id));
                     }
-#line 11503 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11509 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 524: /* f_kwrest: kwrest_mark  */
-#line 5106 "mrbgems/mruby-compiler/core/parse.y"
+#line 5112 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_kw_rest_args(p, 0);
                     }
-#line 11511 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11517 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 525: /* args_tail: f_kwarg ',' f_kwrest opt_f_block_arg  */
-#line 5112 "mrbgems/mruby-compiler/core/parse.y"
+#line 5118 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args_tail(p, (yyvsp[-3].nd), (yyvsp[-1].nd), (yyvsp[0].id));
                     }
-#line 11519 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11525 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 526: /* args_tail: f_kwarg opt_f_block_arg  */
-#line 5116 "mrbgems/mruby-compiler/core/parse.y"
+#line 5122 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args_tail(p, (yyvsp[-1].nd), 0, (yyvsp[0].id));
                     }
-#line 11527 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11533 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 527: /* args_tail: f_kwrest opt_f_block_arg  */
-#line 5120 "mrbgems/mruby-compiler/core/parse.y"
+#line 5126 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args_tail(p, 0, (yyvsp[-1].nd), (yyvsp[0].id));
                     }
-#line 11535 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11541 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 528: /* args_tail: f_block_arg  */
-#line 5124 "mrbgems/mruby-compiler/core/parse.y"
+#line 5130 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args_tail(p, 0, 0, (yyvsp[0].id));
                     }
-#line 11543 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11549 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 529: /* opt_args_tail: ',' args_tail  */
-#line 5130 "mrbgems/mruby-compiler/core/parse.y"
+#line 5136 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[0].nd);
                     }
-#line 11551 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11557 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 530: /* opt_args_tail: %empty  */
-#line 5134 "mrbgems/mruby-compiler/core/parse.y"
+#line 5140 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args_tail(p, 0, 0, 0);
                     }
-#line 11559 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11565 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 531: /* f_args: f_arg ',' f_optarg ',' f_rest_arg opt_args_tail  */
-#line 5140 "mrbgems/mruby-compiler/core/parse.y"
+#line 5146 "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 11567 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11573 "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 5144 "mrbgems/mruby-compiler/core/parse.y"
+#line 5150 "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 11575 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11581 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 533: /* f_args: f_arg ',' f_optarg opt_args_tail  */
-#line 5148 "mrbgems/mruby-compiler/core/parse.y"
+#line 5154 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, (yyvsp[-3].nd), (yyvsp[-1].nd), 0, 0, (yyvsp[0].nd));
                     }
-#line 11583 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11589 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 534: /* f_args: f_arg ',' f_optarg ',' f_arg opt_args_tail  */
-#line 5152 "mrbgems/mruby-compiler/core/parse.y"
+#line 5158 "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 11591 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11597 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 535: /* f_args: f_arg ',' f_rest_arg opt_args_tail  */
-#line 5156 "mrbgems/mruby-compiler/core/parse.y"
+#line 5162 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, (yyvsp[-3].nd), 0, (yyvsp[-1].id), 0, (yyvsp[0].nd));
                     }
-#line 11599 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11605 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 536: /* f_args: f_arg ',' f_rest_arg ',' f_arg opt_args_tail  */
-#line 5160 "mrbgems/mruby-compiler/core/parse.y"
+#line 5166 "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 11607 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11613 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 537: /* f_args: f_arg opt_args_tail  */
-#line 5164 "mrbgems/mruby-compiler/core/parse.y"
+#line 5170 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, (yyvsp[-1].nd), 0, 0, 0, (yyvsp[0].nd));
                     }
-#line 11615 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11621 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 538: /* f_args: f_optarg ',' f_rest_arg opt_args_tail  */
-#line 5168 "mrbgems/mruby-compiler/core/parse.y"
+#line 5174 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, 0, (yyvsp[-3].nd), (yyvsp[-1].id), 0, (yyvsp[0].nd));
                     }
-#line 11623 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11629 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 539: /* f_args: f_optarg ',' f_rest_arg ',' f_arg opt_args_tail  */
-#line 5172 "mrbgems/mruby-compiler/core/parse.y"
+#line 5178 "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 11631 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11637 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 540: /* f_args: f_optarg opt_args_tail  */
-#line 5176 "mrbgems/mruby-compiler/core/parse.y"
+#line 5182 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, 0, (yyvsp[-1].nd), 0, 0, (yyvsp[0].nd));
                     }
-#line 11639 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11645 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 541: /* f_args: f_optarg ',' f_arg opt_args_tail  */
-#line 5180 "mrbgems/mruby-compiler/core/parse.y"
+#line 5186 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, 0, (yyvsp[-3].nd), 0, (yyvsp[-1].nd), (yyvsp[0].nd));
                     }
-#line 11647 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11653 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 542: /* f_args: f_rest_arg opt_args_tail  */
-#line 5184 "mrbgems/mruby-compiler/core/parse.y"
+#line 5190 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, 0, 0, (yyvsp[-1].id), 0, (yyvsp[0].nd));
                     }
-#line 11655 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11661 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 543: /* f_args: f_rest_arg ',' f_arg opt_args_tail  */
-#line 5188 "mrbgems/mruby-compiler/core/parse.y"
+#line 5194 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, 0, 0, (yyvsp[-3].id), (yyvsp[-1].nd), (yyvsp[0].nd));
                     }
-#line 11663 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11669 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 544: /* f_args: args_tail  */
-#line 5192 "mrbgems/mruby-compiler/core/parse.y"
+#line 5198 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, 0, 0, 0, 0, (yyvsp[0].nd));
                     }
-#line 11671 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11677 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 545: /* f_args: %empty  */
-#line 5196 "mrbgems/mruby-compiler/core/parse.y"
+#line 5202 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       local_add_f(p, 0);
                       (yyval.nd) = new_args(p, 0, 0, 0, 0, 0);
                     }
-#line 11680 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11686 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 546: /* f_bad_arg: "constant"  */
-#line 5203 "mrbgems/mruby-compiler/core/parse.y"
+#line 5209 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       yyerror(&(yylsp[0]), p, "formal argument cannot be a constant");
                       (yyval.nd) = 0;
                     }
-#line 11689 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11695 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 547: /* f_bad_arg: "instance variable"  */
-#line 5208 "mrbgems/mruby-compiler/core/parse.y"
+#line 5214 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       yyerror(&(yylsp[0]), p, "formal argument cannot be an instance variable");
                       (yyval.nd) = 0;
                     }
-#line 11698 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11704 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 548: /* f_bad_arg: "global variable"  */
-#line 5213 "mrbgems/mruby-compiler/core/parse.y"
+#line 5219 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       yyerror(&(yylsp[0]), p, "formal argument cannot be a global variable");
                       (yyval.nd) = 0;
                     }
-#line 11707 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11713 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 549: /* f_bad_arg: "class variable"  */
-#line 5218 "mrbgems/mruby-compiler/core/parse.y"
+#line 5224 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       yyerror(&(yylsp[0]), p, "formal argument cannot be a class variable");
                       (yyval.nd) = 0;
                     }
-#line 11716 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11722 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 550: /* f_bad_arg: "numbered parameter"  */
-#line 5223 "mrbgems/mruby-compiler/core/parse.y"
+#line 5229 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       yyerror(&(yylsp[0]), p, "formal argument cannot be a numbered parameter");
                       (yyval.nd) = 0;
                     }
-#line 11725 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11731 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 551: /* f_norm_arg: f_bad_arg  */
-#line 5230 "mrbgems/mruby-compiler/core/parse.y"
+#line 5236 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.id) = 0;
                     }
-#line 11733 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11739 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 552: /* f_norm_arg: "local variable or method"  */
-#line 5234 "mrbgems/mruby-compiler/core/parse.y"
+#line 5240 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       local_add_f(p, (yyvsp[0].id));
                       (yyval.id) = (yyvsp[0].id);
                     }
-#line 11742 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11748 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 553: /* f_arg_item: f_norm_arg  */
-#line 5241 "mrbgems/mruby-compiler/core/parse.y"
+#line 5247 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_arg(p, (yyvsp[0].id));
                     }
-#line 11750 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11756 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 554: /* @32: %empty  */
-#line 5245 "mrbgems/mruby-compiler/core/parse.y"
+#line 5251 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = local_switch(p);
                     }
-#line 11758 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11764 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 555: /* f_arg_item: tLPAREN @32 f_margs rparen  */
-#line 5249 "mrbgems/mruby-compiler/core/parse.y"
+#line 5255 "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 11768 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11774 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 556: /* f_arg: f_arg_item  */
-#line 5257 "mrbgems/mruby-compiler/core/parse.y"
+#line 5263 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1((yyvsp[0].nd));
                     }
-#line 11776 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11782 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 557: /* f_arg: f_arg ',' f_arg_item  */
-#line 5261 "mrbgems/mruby-compiler/core/parse.y"
+#line 5267 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push((yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 11784 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11790 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 558: /* f_opt_asgn: "local variable or method" '='  */
-#line 5267 "mrbgems/mruby-compiler/core/parse.y"
+#line 5273 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       local_add_f(p, (yyvsp[-1].id));
                       local_nest(p);
                       (yyval.id) = (yyvsp[-1].id);
                     }
-#line 11794 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11800 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 559: /* f_opt: f_opt_asgn arg  */
-#line 5275 "mrbgems/mruby-compiler/core/parse.y"
+#line 5281 "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 11804 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11810 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 560: /* f_block_opt: f_opt_asgn primary_value  */
-#line 5283 "mrbgems/mruby-compiler/core/parse.y"
+#line 5289 "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 11814 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11820 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 561: /* f_block_optarg: f_block_opt  */
-#line 5291 "mrbgems/mruby-compiler/core/parse.y"
+#line 5297 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1((yyvsp[0].nd));
                     }
-#line 11822 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11828 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 562: /* f_block_optarg: f_block_optarg ',' f_block_opt  */
-#line 5295 "mrbgems/mruby-compiler/core/parse.y"
+#line 5301 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push((yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 11830 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11836 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 563: /* f_optarg: f_opt  */
-#line 5301 "mrbgems/mruby-compiler/core/parse.y"
+#line 5307 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1((yyvsp[0].nd));
                     }
-#line 11838 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11844 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 564: /* f_optarg: f_optarg ',' f_opt  */
-#line 5305 "mrbgems/mruby-compiler/core/parse.y"
+#line 5311 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push((yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 11846 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11852 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 567: /* f_rest_arg: restarg_mark "local variable or method"  */
-#line 5315 "mrbgems/mruby-compiler/core/parse.y"
+#line 5321 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       local_add_f(p, (yyvsp[0].id));
                       (yyval.id) = (yyvsp[0].id);
                     }
-#line 11855 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11861 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 568: /* f_rest_arg: restarg_mark  */
-#line 5320 "mrbgems/mruby-compiler/core/parse.y"
+#line 5326 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.id) = intern_op(mul);
                       local_add_f(p, (yyval.id));
                     }
-#line 11864 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11870 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 571: /* f_block_arg: blkarg_mark "local variable or method"  */
-#line 5331 "mrbgems/mruby-compiler/core/parse.y"
+#line 5337 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.id) = (yyvsp[0].id);
                     }
-#line 11872 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11878 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 572: /* f_block_arg: blkarg_mark  */
-#line 5335 "mrbgems/mruby-compiler/core/parse.y"
+#line 5341 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.id) = intern_op(and);
                     }
-#line 11880 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11886 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 573: /* opt_f_block_arg: ',' f_block_arg  */
-#line 5341 "mrbgems/mruby-compiler/core/parse.y"
+#line 5347 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.id) = (yyvsp[0].id);
                     }
-#line 11888 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11894 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 574: /* opt_f_block_arg: none  */
-#line 5345 "mrbgems/mruby-compiler/core/parse.y"
+#line 5351 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.id) = 0;
                     }
-#line 11896 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11902 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 575: /* singleton: var_ref  */
-#line 5351 "mrbgems/mruby-compiler/core/parse.y"
+#line 5357 "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 11906 "mrbgems/mruby-compiler/core/y.tab.c"
-    break;
-
-  case 576: /* $@33: %empty  */
-#line 5356 "mrbgems/mruby-compiler/core/parse.y"
-                      {p->lstate = EXPR_BEG;}
 #line 11912 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
+  case 576: /* $@33: %empty  */
+#line 5362 "mrbgems/mruby-compiler/core/parse.y"
+                      {p->lstate = EXPR_BEG;}
+#line 11918 "mrbgems/mruby-compiler/core/y.tab.c"
+    break;
+
   case 577: /* singleton: '(' $@33 expr rparen  */
-#line 5357 "mrbgems/mruby-compiler/core/parse.y"
+#line 5363 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       prohibit_literals(p, (yyvsp[-1].nd));
                       (yyval.nd) = (yyvsp[-1].nd);
                     }
-#line 11921 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11927 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 579: /* assoc_list: assocs trailer  */
-#line 5365 "mrbgems/mruby-compiler/core/parse.y"
+#line 5371 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-1].nd);
                     }
-#line 11929 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11935 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 580: /* assocs: assoc  */
-#line 5371 "mrbgems/mruby-compiler/core/parse.y"
+#line 5377 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1((yyvsp[0].nd));
                     }
-#line 11937 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11943 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 581: /* assocs: assocs comma assoc  */
-#line 5375 "mrbgems/mruby-compiler/core/parse.y"
+#line 5381 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push((yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 11945 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11951 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 582: /* assoc: arg "=>" arg  */
-#line 5381 "mrbgems/mruby-compiler/core/parse.y"
+#line 5387 "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 11955 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11961 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 583: /* assoc: "local variable or method" "label" arg  */
-#line 5387 "mrbgems/mruby-compiler/core/parse.y"
+#line 5393 "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 11964 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11970 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 584: /* assoc: "local variable or method" "label"  */
-#line 5392 "mrbgems/mruby-compiler/core/parse.y"
+#line 5398 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = cons(new_sym(p, (yyvsp[-1].id)), label_reference(p, (yyvsp[-1].id)));
                     }
-#line 11972 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11978 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 585: /* assoc: "numbered parameter" "label"  */
-#line 5396 "mrbgems/mruby-compiler/core/parse.y"
+#line 5402 "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 11981 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11987 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 586: /* assoc: "numbered parameter" "label" arg  */
-#line 5401 "mrbgems/mruby-compiler/core/parse.y"
+#line 5407 "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 11990 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 11996 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 587: /* assoc: string_fragment "label" arg  */
-#line 5406 "mrbgems/mruby-compiler/core/parse.y"
+#line 5412 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       void_expr_error(p, (yyvsp[0].nd));
                       if (node_to_type((yyvsp[-2].nd)->car) == NODE_DSTR) {
@@ -12000,75 +12006,75 @@ yyreduce:
                         (yyval.nd) = cons(new_sym(p, new_strsym(p, (yyvsp[-2].nd))), (yyvsp[0].nd));
                       }
                     }
-#line 12004 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 12010 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 588: /* assoc: "**" arg  */
-#line 5416 "mrbgems/mruby-compiler/core/parse.y"
+#line 5422 "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 12013 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 12019 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 589: /* assoc: "**"  */
-#line 5421 "mrbgems/mruby-compiler/core/parse.y"
+#line 5427 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = cons(new_kw_rest_args(p, 0), new_lvar(p, intern_op(pow)));
                     }
-#line 12021 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 12027 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 602: /* call_op: '.'  */
-#line 5447 "mrbgems/mruby-compiler/core/parse.y"
+#line 5453 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.num) = '.';
                     }
-#line 12029 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 12035 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 603: /* call_op: "&."  */
-#line 5451 "mrbgems/mruby-compiler/core/parse.y"
+#line 5457 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.num) = 0;
                     }
-#line 12037 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 12043 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 605: /* call_op2: "::"  */
-#line 5458 "mrbgems/mruby-compiler/core/parse.y"
+#line 5464 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.num) = tCOLON2;
                     }
-#line 12045 "mrbgems/mruby-compiler/core/y.tab.c"
-    break;
-
-  case 614: /* term: ';'  */
-#line 5479 "mrbgems/mruby-compiler/core/parse.y"
-                      {yyerrok;}
 #line 12051 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
+  case 614: /* term: ';'  */
+#line 5485 "mrbgems/mruby-compiler/core/parse.y"
+                      {yyerrok;}
+#line 12057 "mrbgems/mruby-compiler/core/y.tab.c"
+    break;
+
   case 616: /* nl: '\n'  */
-#line 5484 "mrbgems/mruby-compiler/core/parse.y"
+#line 5490 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       p->lineno += (yyvsp[0].num);
                       p->column = 0;
                     }
-#line 12060 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 12066 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 620: /* none: %empty  */
-#line 5496 "mrbgems/mruby-compiler/core/parse.y"
+#line 5502 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = 0;
                     }
-#line 12068 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 12074 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
 
-#line 12072 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 12078 "mrbgems/mruby-compiler/core/y.tab.c"
 
       default: break;
     }
@@ -12301,7 +12307,7 @@ yyreturnlab:
   return yyresult;
 }
 
-#line 5500 "mrbgems/mruby-compiler/core/parse.y"
+#line 5506 "mrbgems/mruby-compiler/core/parse.y"
 
 #define pylval  (*((YYSTYPE*)(p->ylval)))
 
@@ -13259,11 +13265,11 @@ parse_string(parser_state *p)
     else {
       encp = NULL;
     }
-    pylval.nd = new_regx(p, s, dup, encp);
+    pylval.nd = cons_head((node*)NODE_REGX, cons((node*)s, cons((node*)dup, (node*)encp)));
 
     return tREGEXP;
   }
-  pylval.nd = new_str(p, tok(p), toklen(p));
+  pylval.nd = cons_head((node*)NODE_STR, cons((node*)strndup(tok(p), toklen(p)), int_to_node(toklen(p))));
 
   return tSTRING;
 }