diff --git a/AUTHORS b/AUTHORS
index 84ba596eb..404cb2f9c 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -1,13 +1,13 @@
 # Authors of mruby (mruby developers)
 
-## The List of Contributors sorted by number of commits (as of 2021-11-22 01cadd3)
+## The List of Contributors sorted by number of commits (as of 2022-01-10 69b1667)
 
-   7874 Yukihiro "Matz" Matsumoto (@matz)*
+   7956 Yukihiro "Matz" Matsumoto (@matz)*
     586 KOBAYASHI Shuji (@shuujii)
     376 Daniel Bovensiepen (@bovi)
     346 Takeshi Watanabe (@take-cheeze)*
+    342 dearblue (@dearblue)*
     334 Masaki Muranaka (@monaka)
-    321 dearblue (@dearblue)*
     298 Tomoyuki Sahara (@tsahara)*
     234 Jun Hiroe (@suzukaze)
     219 Cremno (@cremno)*
@@ -19,13 +19,13 @@
      80 Masamitsu MURASE (@masamitsu-murase)
      74 Yuichiro MASUI (@masuidrive)
      71 Tatsuhiko Kubo (@cubicdaiya)*
-     67 Hiroshi Mimaki (@mimaki)*
+     68 Hiroshi Mimaki (@mimaki)*
      63 Akira Yumiyama (@akiray03)*
      62 Paolo Bosetti (@pbosetti)*
      59 Kurebayashi, Takahiro (@crimsonwoods)*
      56 h2so5 (@h2so5)
      52 Ralph Desir (@Mav7)*
-     47 John Bampton (@jbampton)
+     49 John Bampton (@jbampton)
      45 Rory O'Connell (@RoryO)*
      43 Yuichiro Kaneko (@yui-knk)+
      42 fleuria (@flaneur2020)
diff --git a/mrbgems/mruby-compiler/core/parse.y b/mrbgems/mruby-compiler/core/parse.y
index de905e33f..71cdddf68 100644
--- a/mrbgems/mruby-compiler/core/parse.y
+++ b/mrbgems/mruby-compiler/core/parse.y
@@ -712,9 +712,6 @@ new_cvar(parser_state *p, mrb_sym sym)
 static node*
 new_nvar(parser_state *p, int num)
 {
-  int nvars = intn(p->nvars->car);
-
-  p->nvars->car = nint(nvars > num ? nvars : num);
   return cons((node*)NODE_NVAR, nint(num));
 }
 
@@ -6425,12 +6422,17 @@ parser_yylex(parser_state *p)
             nvars = nvars->cdr;
           }
           nvar = intn(p->nvars->car);
-          if (nvar == -1) {
-            yywarning(p, "numbered parameter used in inner block");
+          if (nvar != -2) {     /* numbered parameters never appear on toplevel */
+            if (nvar == -1) {
+              yywarning(p, "numbered parameter used in inner block");
+            }
+            else {
+              p->nvars->car = nint(nvar > n ? nvar : n);
+            }
+            pylval.num = n;
+            p->lstate = EXPR_END;
+            return tNUMPARAM;
           }
-          pylval.num = n;
-          p->lstate = EXPR_END;
-          return tNUMPARAM;
         }
       }
       /* fall through */
diff --git a/mrbgems/mruby-compiler/core/y.tab.c b/mrbgems/mruby-compiler/core/y.tab.c
index c29e709e7..d4ef4b618 100644
--- a/mrbgems/mruby-compiler/core/y.tab.c
+++ b/mrbgems/mruby-compiler/core/y.tab.c
@@ -775,9 +775,6 @@ new_cvar(parser_state *p, mrb_sym sym)
 static node*
 new_nvar(parser_state *p, int num)
 {
-  int nvars = intn(p->nvars->car);
-
-  p->nvars->car = nint(nvars > num ? nvars : num);
   return cons((node*)NODE_NVAR, nint(num));
 }
 
@@ -1500,7 +1497,7 @@ heredoc_end(parser_state *p)
 /* xxx ----------------------------- */
 
 
-#line 1504 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 1501 "mrbgems/mruby-compiler/core/y.tab.c"
 
 # ifndef YY_CAST
 #  ifdef __cplusplus
@@ -1672,7 +1669,7 @@ extern int yydebug;
 #if ! defined YYSTYPE && ! defined YYSTYPE_IS_DECLARED
 union YYSTYPE
 {
-#line 1446 "mrbgems/mruby-compiler/core/parse.y"
+#line 1443 "mrbgems/mruby-compiler/core/parse.y"
 
     node *nd;
     mrb_sym id;
@@ -1680,7 +1677,7 @@ union YYSTYPE
     stack_type stack;
     const struct vtable *vars;
 
-#line 1684 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 1681 "mrbgems/mruby-compiler/core/y.tab.c"
 
 };
 typedef union YYSTYPE YYSTYPE;
@@ -2066,68 +2063,68 @@ static const yytype_uint8 yytranslate[] =
   /* YYRLINE[YYN] -- Source line where rule number YYN was defined.  */
 static const yytype_int16 yyrline[] =
 {
-       0,  1617,  1617,  1617,  1628,  1634,  1638,  1643,  1647,  1653,
-    1655,  1654,  1668,  1695,  1701,  1705,  1710,  1714,  1720,  1720,
-    1724,  1728,  1732,  1736,  1740,  1744,  1748,  1753,  1754,  1758,
-    1762,  1766,  1770,  1776,  1779,  1783,  1787,  1791,  1795,  1799,
-    1804,  1808,  1817,  1826,  1835,  1844,  1851,  1852,  1856,  1860,
-    1861,  1865,  1869,  1873,  1877,  1881,  1891,  1890,  1905,  1914,
-    1915,  1918,  1919,  1926,  1925,  1940,  1944,  1949,  1953,  1958,
-    1962,  1967,  1971,  1975,  1979,  1983,  1989,  1993,  1999,  2000,
-    2006,  2010,  2014,  2018,  2022,  2026,  2030,  2034,  2038,  2042,
-    2048,  2049,  2055,  2059,  2065,  2069,  2075,  2079,  2083,  2087,
-    2091,  2095,  2101,  2107,  2114,  2118,  2122,  2126,  2130,  2134,
-    2140,  2146,  2151,  2157,  2161,  2164,  2168,  2172,  2179,  2180,
-    2181,  2182,  2187,  2194,  2195,  2198,  2202,  2202,  2208,  2209,
-    2210,  2211,  2212,  2213,  2214,  2215,  2216,  2217,  2218,  2219,
-    2220,  2221,  2222,  2223,  2224,  2225,  2226,  2227,  2228,  2229,
-    2230,  2231,  2232,  2233,  2234,  2235,  2236,  2237,  2240,  2240,
-    2240,  2241,  2241,  2242,  2242,  2242,  2243,  2243,  2243,  2243,
-    2244,  2244,  2244,  2245,  2245,  2245,  2246,  2246,  2246,  2246,
-    2247,  2247,  2247,  2247,  2248,  2248,  2248,  2248,  2249,  2249,
-    2249,  2249,  2250,  2250,  2250,  2250,  2251,  2251,  2254,  2258,
-    2262,  2266,  2270,  2274,  2278,  2283,  2288,  2293,  2297,  2301,
-    2305,  2309,  2313,  2317,  2321,  2325,  2329,  2333,  2337,  2341,
-    2345,  2349,  2353,  2357,  2361,  2365,  2369,  2373,  2377,  2381,
-    2385,  2389,  2393,  2397,  2401,  2405,  2409,  2413,  2417,  2421,
-    2425,  2429,  2433,  2437,  2441,  2450,  2459,  2468,  2477,  2483,
-    2484,  2489,  2493,  2500,  2504,  2511,  2515,  2524,  2541,  2542,
-    2545,  2546,  2547,  2552,  2557,  2564,  2570,  2575,  2580,  2585,
-    2592,  2592,  2603,  2607,  2613,  2617,  2623,  2626,  2632,  2637,
-    2642,  2648,  2653,  2657,  2663,  2664,  2665,  2666,  2667,  2668,
-    2669,  2670,  2674,  2679,  2678,  2690,  2694,  2689,  2699,  2699,
-    2703,  2707,  2711,  2715,  2720,  2725,  2729,  2733,  2737,  2741,
-    2745,  2746,  2752,  2759,  2751,  2772,  2780,  2788,  2788,  2788,
-    2795,  2795,  2795,  2802,  2808,  2813,  2815,  2812,  2824,  2822,
-    2840,  2845,  2838,  2862,  2860,  2876,  2886,  2897,  2901,  2905,
-    2909,  2915,  2922,  2923,  2924,  2927,  2928,  2931,  2932,  2940,
-    2941,  2947,  2951,  2954,  2958,  2962,  2966,  2970,  2974,  2978,
-    2982,  2986,  2992,  2996,  3000,  3004,  3010,  3015,  3020,  3024,
-    3028,  3032,  3036,  3040,  3044,  3048,  3052,  3056,  3060,  3064,
-    3068,  3072,  3076,  3082,  3087,  3094,  3094,  3098,  3103,  3110,
-    3114,  3120,  3121,  3124,  3129,  3132,  3136,  3142,  3146,  3153,
-    3152,  3167,  3177,  3181,  3186,  3193,  3197,  3201,  3205,  3209,
-    3213,  3217,  3221,  3225,  3232,  3231,  3246,  3245,  3261,  3269,
-    3278,  3281,  3288,  3291,  3295,  3296,  3299,  3303,  3306,  3310,
-    3313,  3314,  3315,  3316,  3319,  3320,  3326,  3327,  3328,  3332,
-    3345,  3346,  3352,  3357,  3356,  3367,  3371,  3377,  3381,  3394,
-    3398,  3404,  3407,  3408,  3411,  3417,  3423,  3424,  3427,  3434,
-    3433,  3447,  3451,  3465,  3470,  3484,  3490,  3491,  3492,  3493,
-    3494,  3498,  3504,  3508,  3518,  3519,  3520,  3524,  3530,  3534,
-    3538,  3542,  3546,  3552,  3556,  3562,  3566,  3570,  3574,  3578,
-    3582,  3590,  3597,  3603,  3604,  3608,  3612,  3611,  3628,  3629,
-    3632,  3638,  3642,  3648,  3649,  3653,  3657,  3663,  3669,  3675,
-    3682,  3688,  3695,  3699,  3705,  3709,  3715,  3716,  3719,  3723,
-    3729,  3733,  3737,  3741,  3747,  3752,  3757,  3761,  3765,  3769,
-    3773,  3777,  3781,  3785,  3789,  3793,  3797,  3801,  3805,  3809,
-    3814,  3820,  3825,  3830,  3835,  3840,  3847,  3851,  3858,  3863,
-    3862,  3873,  3877,  3883,  3891,  3899,  3907,  3911,  3917,  3921,
-    3927,  3928,  3931,  3936,  3943,  3944,  3947,  3951,  3957,  3961,
-    3967,  3972,  3972,  3997,  3998,  4004,  4009,  4015,  4021,  4026,
-    4030,  4040,  4047,  4048,  4049,  4052,  4053,  4054,  4055,  4058,
-    4059,  4060,  4063,  4064,  4067,  4071,  4077,  4078,  4084,  4085,
-    4088,  4089,  4092,  4095,  4096,  4097,  4100,  4101,  4104,  4109,
-    4112,  4113,  4117
+       0,  1614,  1614,  1614,  1625,  1631,  1635,  1640,  1644,  1650,
+    1652,  1651,  1665,  1692,  1698,  1702,  1707,  1711,  1717,  1717,
+    1721,  1725,  1729,  1733,  1737,  1741,  1745,  1750,  1751,  1755,
+    1759,  1763,  1767,  1773,  1776,  1780,  1784,  1788,  1792,  1796,
+    1801,  1805,  1814,  1823,  1832,  1841,  1848,  1849,  1853,  1857,
+    1858,  1862,  1866,  1870,  1874,  1878,  1888,  1887,  1902,  1911,
+    1912,  1915,  1916,  1923,  1922,  1937,  1941,  1946,  1950,  1955,
+    1959,  1964,  1968,  1972,  1976,  1980,  1986,  1990,  1996,  1997,
+    2003,  2007,  2011,  2015,  2019,  2023,  2027,  2031,  2035,  2039,
+    2045,  2046,  2052,  2056,  2062,  2066,  2072,  2076,  2080,  2084,
+    2088,  2092,  2098,  2104,  2111,  2115,  2119,  2123,  2127,  2131,
+    2137,  2143,  2148,  2154,  2158,  2161,  2165,  2169,  2176,  2177,
+    2178,  2179,  2184,  2191,  2192,  2195,  2199,  2199,  2205,  2206,
+    2207,  2208,  2209,  2210,  2211,  2212,  2213,  2214,  2215,  2216,
+    2217,  2218,  2219,  2220,  2221,  2222,  2223,  2224,  2225,  2226,
+    2227,  2228,  2229,  2230,  2231,  2232,  2233,  2234,  2237,  2237,
+    2237,  2238,  2238,  2239,  2239,  2239,  2240,  2240,  2240,  2240,
+    2241,  2241,  2241,  2242,  2242,  2242,  2243,  2243,  2243,  2243,
+    2244,  2244,  2244,  2244,  2245,  2245,  2245,  2245,  2246,  2246,
+    2246,  2246,  2247,  2247,  2247,  2247,  2248,  2248,  2251,  2255,
+    2259,  2263,  2267,  2271,  2275,  2280,  2285,  2290,  2294,  2298,
+    2302,  2306,  2310,  2314,  2318,  2322,  2326,  2330,  2334,  2338,
+    2342,  2346,  2350,  2354,  2358,  2362,  2366,  2370,  2374,  2378,
+    2382,  2386,  2390,  2394,  2398,  2402,  2406,  2410,  2414,  2418,
+    2422,  2426,  2430,  2434,  2438,  2447,  2456,  2465,  2474,  2480,
+    2481,  2486,  2490,  2497,  2501,  2508,  2512,  2521,  2538,  2539,
+    2542,  2543,  2544,  2549,  2554,  2561,  2567,  2572,  2577,  2582,
+    2589,  2589,  2600,  2604,  2610,  2614,  2620,  2623,  2629,  2634,
+    2639,  2645,  2650,  2654,  2660,  2661,  2662,  2663,  2664,  2665,
+    2666,  2667,  2671,  2676,  2675,  2687,  2691,  2686,  2696,  2696,
+    2700,  2704,  2708,  2712,  2717,  2722,  2726,  2730,  2734,  2738,
+    2742,  2743,  2749,  2756,  2748,  2769,  2777,  2785,  2785,  2785,
+    2792,  2792,  2792,  2799,  2805,  2810,  2812,  2809,  2821,  2819,
+    2837,  2842,  2835,  2859,  2857,  2873,  2883,  2894,  2898,  2902,
+    2906,  2912,  2919,  2920,  2921,  2924,  2925,  2928,  2929,  2937,
+    2938,  2944,  2948,  2951,  2955,  2959,  2963,  2967,  2971,  2975,
+    2979,  2983,  2989,  2993,  2997,  3001,  3007,  3012,  3017,  3021,
+    3025,  3029,  3033,  3037,  3041,  3045,  3049,  3053,  3057,  3061,
+    3065,  3069,  3073,  3079,  3084,  3091,  3091,  3095,  3100,  3107,
+    3111,  3117,  3118,  3121,  3126,  3129,  3133,  3139,  3143,  3150,
+    3149,  3164,  3174,  3178,  3183,  3190,  3194,  3198,  3202,  3206,
+    3210,  3214,  3218,  3222,  3229,  3228,  3243,  3242,  3258,  3266,
+    3275,  3278,  3285,  3288,  3292,  3293,  3296,  3300,  3303,  3307,
+    3310,  3311,  3312,  3313,  3316,  3317,  3323,  3324,  3325,  3329,
+    3342,  3343,  3349,  3354,  3353,  3364,  3368,  3374,  3378,  3391,
+    3395,  3401,  3404,  3405,  3408,  3414,  3420,  3421,  3424,  3431,
+    3430,  3444,  3448,  3462,  3467,  3481,  3487,  3488,  3489,  3490,
+    3491,  3495,  3501,  3505,  3515,  3516,  3517,  3521,  3527,  3531,
+    3535,  3539,  3543,  3549,  3553,  3559,  3563,  3567,  3571,  3575,
+    3579,  3587,  3594,  3600,  3601,  3605,  3609,  3608,  3625,  3626,
+    3629,  3635,  3639,  3645,  3646,  3650,  3654,  3660,  3666,  3672,
+    3679,  3685,  3692,  3696,  3702,  3706,  3712,  3713,  3716,  3720,
+    3726,  3730,  3734,  3738,  3744,  3749,  3754,  3758,  3762,  3766,
+    3770,  3774,  3778,  3782,  3786,  3790,  3794,  3798,  3802,  3806,
+    3811,  3817,  3822,  3827,  3832,  3837,  3844,  3848,  3855,  3860,
+    3859,  3870,  3874,  3880,  3888,  3896,  3904,  3908,  3914,  3918,
+    3924,  3925,  3928,  3933,  3940,  3941,  3944,  3948,  3954,  3958,
+    3964,  3969,  3969,  3994,  3995,  4001,  4006,  4012,  4018,  4023,
+    4027,  4037,  4044,  4045,  4046,  4049,  4050,  4051,  4052,  4055,
+    4056,  4057,  4060,  4061,  4064,  4068,  4074,  4075,  4081,  4082,
+    4085,  4086,  4089,  4092,  4093,  4094,  4097,  4098,  4101,  4106,
+    4109,  4110,  4114
 };
 #endif
 
@@ -6144,86 +6141,86 @@ yyreduce:
   switch (yyn)
     {
   case 2:
-#line 1617 "mrbgems/mruby-compiler/core/parse.y"
+#line 1614 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       p->lstate = EXPR_BEG;
                       if (!p->locals) p->locals = cons(0,0);
                     }
-#line 6153 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6150 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 3:
-#line 1622 "mrbgems/mruby-compiler/core/parse.y"
+#line 1619 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       p->tree = new_scope(p, (yyvsp[0].nd));
                       NODE_LINENO(p->tree, (yyvsp[0].nd));
                     }
-#line 6162 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6159 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 4:
-#line 1629 "mrbgems/mruby-compiler/core/parse.y"
+#line 1626 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-1].nd);
                     }
-#line 6170 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6167 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 5:
-#line 1635 "mrbgems/mruby-compiler/core/parse.y"
+#line 1632 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_begin(p, 0);
                     }
-#line 6178 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6175 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 6:
-#line 1639 "mrbgems/mruby-compiler/core/parse.y"
+#line 1636 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_begin(p, (yyvsp[0].nd));
                       NODE_LINENO((yyval.nd), (yyvsp[0].nd));
                     }
-#line 6187 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6184 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 7:
-#line 1644 "mrbgems/mruby-compiler/core/parse.y"
+#line 1641 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push((yyvsp[-2].nd), newline_node((yyvsp[0].nd)));
                     }
-#line 6195 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6192 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 8:
-#line 1648 "mrbgems/mruby-compiler/core/parse.y"
+#line 1645 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_begin(p, 0);
                     }
-#line 6203 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6200 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 10:
-#line 1655 "mrbgems/mruby-compiler/core/parse.y"
+#line 1652 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = local_switch(p);
                       nvars_block(p);
                     }
-#line 6212 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6209 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 11:
-#line 1660 "mrbgems/mruby-compiler/core/parse.y"
+#line 1657 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       yyerror(p, "BEGIN not supported");
                       local_resume(p, (yyvsp[-3].nd));
                       nvars_unnest(p);
                       (yyval.nd) = 0;
                     }
-#line 6223 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6220 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 12:
-#line 1672 "mrbgems/mruby-compiler/core/parse.y"
+#line 1669 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       if ((yyvsp[-2].nd)) {
                         (yyval.nd) = new_rescue(p, (yyvsp[-3].nd), (yyvsp[-2].nd), (yyvsp[-1].nd));
@@ -6245,222 +6242,222 @@ yyreduce:
                         }
                       }
                     }
-#line 6249 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6246 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 13:
-#line 1696 "mrbgems/mruby-compiler/core/parse.y"
+#line 1693 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-1].nd);
                     }
-#line 6257 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6254 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 14:
-#line 1702 "mrbgems/mruby-compiler/core/parse.y"
+#line 1699 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_begin(p, 0);
                     }
-#line 6265 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6262 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 15:
-#line 1706 "mrbgems/mruby-compiler/core/parse.y"
+#line 1703 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_begin(p, (yyvsp[0].nd));
                       NODE_LINENO((yyval.nd), (yyvsp[0].nd));
                     }
-#line 6274 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6271 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 16:
-#line 1711 "mrbgems/mruby-compiler/core/parse.y"
+#line 1708 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push((yyvsp[-2].nd), newline_node((yyvsp[0].nd)));
                     }
-#line 6282 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6279 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 17:
-#line 1715 "mrbgems/mruby-compiler/core/parse.y"
+#line 1712 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_begin(p, (yyvsp[0].nd));
                     }
-#line 6290 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6287 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 18:
-#line 1720 "mrbgems/mruby-compiler/core/parse.y"
+#line 1717 "mrbgems/mruby-compiler/core/parse.y"
                                      {p->lstate = EXPR_FNAME;}
-#line 6296 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6293 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 19:
-#line 1721 "mrbgems/mruby-compiler/core/parse.y"
+#line 1718 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_alias(p, (yyvsp[-2].id), (yyvsp[0].id));
                     }
-#line 6304 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6301 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 20:
-#line 1725 "mrbgems/mruby-compiler/core/parse.y"
+#line 1722 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[0].nd);
                     }
-#line 6312 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6309 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 21:
-#line 1729 "mrbgems/mruby-compiler/core/parse.y"
+#line 1726 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_if(p, cond((yyvsp[0].nd)), (yyvsp[-2].nd), 0);
                     }
-#line 6320 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6317 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 22:
-#line 1733 "mrbgems/mruby-compiler/core/parse.y"
+#line 1730 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_unless(p, cond((yyvsp[0].nd)), (yyvsp[-2].nd), 0);
                     }
-#line 6328 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6325 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 23:
-#line 1737 "mrbgems/mruby-compiler/core/parse.y"
+#line 1734 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_while(p, cond((yyvsp[0].nd)), (yyvsp[-2].nd));
                     }
-#line 6336 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6333 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 24:
-#line 1741 "mrbgems/mruby-compiler/core/parse.y"
+#line 1738 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_until(p, cond((yyvsp[0].nd)), (yyvsp[-2].nd));
                     }
-#line 6344 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6341 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 25:
-#line 1745 "mrbgems/mruby-compiler/core/parse.y"
+#line 1742 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_mod_rescue(p, (yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 6352 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6349 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 26:
-#line 1749 "mrbgems/mruby-compiler/core/parse.y"
+#line 1746 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       yyerror(p, "END not supported");
                       (yyval.nd) = new_postexe(p, (yyvsp[-1].nd));
                     }
-#line 6361 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6358 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 28:
-#line 1755 "mrbgems/mruby-compiler/core/parse.y"
+#line 1752 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_masgn(p, (yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 6369 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6366 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 29:
-#line 1759 "mrbgems/mruby-compiler/core/parse.y"
+#line 1756 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_asgn(p, (yyvsp[-2].nd), new_array(p, (yyvsp[0].nd)));
                     }
-#line 6377 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6374 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 30:
-#line 1763 "mrbgems/mruby-compiler/core/parse.y"
+#line 1760 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_masgn(p, (yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 6385 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6382 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 31:
-#line 1767 "mrbgems/mruby-compiler/core/parse.y"
+#line 1764 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_masgn(p, (yyvsp[-2].nd), new_array(p, (yyvsp[0].nd)));
                     }
-#line 6393 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6390 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 32:
-#line 1771 "mrbgems/mruby-compiler/core/parse.y"
+#line 1768 "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 6403 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6400 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 34:
-#line 1780 "mrbgems/mruby-compiler/core/parse.y"
+#line 1777 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_asgn(p, (yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 6411 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6408 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 35:
-#line 1784 "mrbgems/mruby-compiler/core/parse.y"
+#line 1781 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_op_asgn(p, (yyvsp[-2].nd), (yyvsp[-1].id), (yyvsp[0].nd));
                     }
-#line 6419 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6416 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 36:
-#line 1788 "mrbgems/mruby-compiler/core/parse.y"
+#line 1785 "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 6427 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6424 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 37:
-#line 1792 "mrbgems/mruby-compiler/core/parse.y"
+#line 1789 "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 6435 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6432 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 38:
-#line 1796 "mrbgems/mruby-compiler/core/parse.y"
+#line 1793 "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 6443 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6440 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 39:
-#line 1800 "mrbgems/mruby-compiler/core/parse.y"
+#line 1797 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       yyerror(p, "constant re-assignment");
                       (yyval.nd) = 0;
                     }
-#line 6452 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6449 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 40:
-#line 1805 "mrbgems/mruby-compiler/core/parse.y"
+#line 1802 "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 6460 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6457 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 41:
-#line 1809 "mrbgems/mruby-compiler/core/parse.y"
+#line 1806 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-3].nd);
                       endless_method_name(p, (yyvsp[-3].nd));
@@ -6469,11 +6466,11 @@ yyreduce:
                       nvars_unnest(p);
                       p->in_def--;
                     }
-#line 6473 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6470 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 42:
-#line 1818 "mrbgems/mruby-compiler/core/parse.y"
+#line 1815 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-5].nd);
                       endless_method_name(p, (yyvsp[-5].nd));
@@ -6482,11 +6479,11 @@ yyreduce:
                       nvars_unnest(p);
                       p->in_def--;
                     }
-#line 6486 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6483 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 43:
-#line 1827 "mrbgems/mruby-compiler/core/parse.y"
+#line 1824 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-3].nd);
                       void_expr_error(p, (yyvsp[0].nd));
@@ -6495,11 +6492,11 @@ yyreduce:
                       p->in_def--;
                       p->in_single--;
                     }
-#line 6499 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6496 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 44:
-#line 1836 "mrbgems/mruby-compiler/core/parse.y"
+#line 1833 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-5].nd);
                       void_expr_error(p, (yyvsp[-2].nd));
@@ -6508,79 +6505,79 @@ yyreduce:
                       p->in_def--;
                       p->in_single--;
                     }
-#line 6512 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6509 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 45:
-#line 1845 "mrbgems/mruby-compiler/core/parse.y"
+#line 1842 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       backref_error(p, (yyvsp[-2].nd));
                       (yyval.nd) = new_begin(p, 0);
                     }
-#line 6521 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6518 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 47:
-#line 1853 "mrbgems/mruby-compiler/core/parse.y"
+#line 1850 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_mod_rescue(p, (yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 6529 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6526 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 50:
-#line 1862 "mrbgems/mruby-compiler/core/parse.y"
+#line 1859 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_and(p, (yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 6537 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6534 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 51:
-#line 1866 "mrbgems/mruby-compiler/core/parse.y"
+#line 1863 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_or(p, (yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 6545 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6542 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 52:
-#line 1870 "mrbgems/mruby-compiler/core/parse.y"
+#line 1867 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_uni_op(p, cond((yyvsp[0].nd)), "!");
                     }
-#line 6553 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6550 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 53:
-#line 1874 "mrbgems/mruby-compiler/core/parse.y"
+#line 1871 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_uni_op(p, cond((yyvsp[0].nd)), "!");
                     }
-#line 6561 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6558 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 55:
-#line 1882 "mrbgems/mruby-compiler/core/parse.y"
+#line 1879 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_def(p, (yyvsp[0].id), nint(p->cmdarg_stack), local_switch(p));
                       p->cmdarg_stack = 0;
                       p->in_def++;
                       nvars_block(p);
                     }
-#line 6572 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6569 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 56:
-#line 1891 "mrbgems/mruby-compiler/core/parse.y"
+#line 1888 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       p->lstate = EXPR_FNAME;
                     }
-#line 6580 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6577 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 57:
-#line 1895 "mrbgems/mruby-compiler/core/parse.y"
+#line 1892 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_sdef(p, (yyvsp[-3].nd), (yyvsp[0].id), nint(p->cmdarg_stack), local_switch(p));
                       p->cmdarg_stack = 0;
@@ -6589,1054 +6586,1054 @@ yyreduce:
                       nvars_block(p);
                       p->lstate = EXPR_ENDFN; /* force for args */
                     }
-#line 6593 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6590 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 58:
-#line 1906 "mrbgems/mruby-compiler/core/parse.y"
+#line 1903 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       if (!(yyvsp[0].nd)) (yyval.nd) = new_nil(p);
                       else {
                         (yyval.nd) = (yyvsp[0].nd);
                       }
                     }
-#line 6604 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6601 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 62:
-#line 1920 "mrbgems/mruby-compiler/core/parse.y"
+#line 1917 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-3].nd), (yyvsp[-1].id), (yyvsp[0].nd), (yyvsp[-2].num));
                     }
-#line 6612 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6609 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 63:
-#line 1926 "mrbgems/mruby-compiler/core/parse.y"
+#line 1923 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       local_nest(p);
                       nvars_nest(p);
                     }
-#line 6621 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6618 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 64:
-#line 1933 "mrbgems/mruby-compiler/core/parse.y"
+#line 1930 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_block(p, (yyvsp[-2].nd), (yyvsp[-1].nd));
                       local_unnest(p);
                       nvars_unnest(p);
                     }
-#line 6631 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6628 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 65:
-#line 1941 "mrbgems/mruby-compiler/core/parse.y"
+#line 1938 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_fcall(p, (yyvsp[-1].id), (yyvsp[0].nd));
                     }
-#line 6639 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6636 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 66:
-#line 1945 "mrbgems/mruby-compiler/core/parse.y"
+#line 1942 "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 6648 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6645 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 67:
-#line 1950 "mrbgems/mruby-compiler/core/parse.y"
+#line 1947 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-3].nd), (yyvsp[-1].id), (yyvsp[0].nd), (yyvsp[-2].num));
                     }
-#line 6656 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6653 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 68:
-#line 1954 "mrbgems/mruby-compiler/core/parse.y"
+#line 1951 "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 6665 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6662 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 69:
-#line 1959 "mrbgems/mruby-compiler/core/parse.y"
+#line 1956 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-3].nd), (yyvsp[-1].id), (yyvsp[0].nd), tCOLON2);
                     }
-#line 6673 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6670 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 70:
-#line 1963 "mrbgems/mruby-compiler/core/parse.y"
+#line 1960 "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 6682 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6679 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 71:
-#line 1968 "mrbgems/mruby-compiler/core/parse.y"
+#line 1965 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_super(p, (yyvsp[0].nd));
                     }
-#line 6690 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6687 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 72:
-#line 1972 "mrbgems/mruby-compiler/core/parse.y"
+#line 1969 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_yield(p, (yyvsp[0].nd));
                     }
-#line 6698 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6695 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 73:
-#line 1976 "mrbgems/mruby-compiler/core/parse.y"
+#line 1973 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_return(p, ret_args(p, (yyvsp[0].nd)));
                     }
-#line 6706 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6703 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 74:
-#line 1980 "mrbgems/mruby-compiler/core/parse.y"
+#line 1977 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_break(p, ret_args(p, (yyvsp[0].nd)));
                     }
-#line 6714 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6711 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 75:
-#line 1984 "mrbgems/mruby-compiler/core/parse.y"
+#line 1981 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_next(p, ret_args(p, (yyvsp[0].nd)));
                     }
-#line 6722 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6719 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 76:
-#line 1990 "mrbgems/mruby-compiler/core/parse.y"
+#line 1987 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[0].nd);
                     }
-#line 6730 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6727 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 77:
-#line 1994 "mrbgems/mruby-compiler/core/parse.y"
+#line 1991 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-1].nd);
                     }
-#line 6738 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6735 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 79:
-#line 2001 "mrbgems/mruby-compiler/core/parse.y"
+#line 1998 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-1].nd);
                     }
-#line 6746 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6743 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 80:
-#line 2007 "mrbgems/mruby-compiler/core/parse.y"
+#line 2004 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1((yyvsp[0].nd));
                     }
-#line 6754 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6751 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 81:
-#line 2011 "mrbgems/mruby-compiler/core/parse.y"
+#line 2008 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1(push((yyvsp[-1].nd),(yyvsp[0].nd)));
                     }
-#line 6762 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6759 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 82:
-#line 2015 "mrbgems/mruby-compiler/core/parse.y"
+#line 2012 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list2((yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 6770 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6767 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 83:
-#line 2019 "mrbgems/mruby-compiler/core/parse.y"
+#line 2016 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list3((yyvsp[-4].nd), (yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 6778 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6775 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 84:
-#line 2023 "mrbgems/mruby-compiler/core/parse.y"
+#line 2020 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list2((yyvsp[-1].nd), new_nil(p));
                     }
-#line 6786 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6783 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 85:
-#line 2027 "mrbgems/mruby-compiler/core/parse.y"
+#line 2024 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list3((yyvsp[-3].nd), new_nil(p), (yyvsp[0].nd));
                     }
-#line 6794 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6791 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 86:
-#line 2031 "mrbgems/mruby-compiler/core/parse.y"
+#line 2028 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list2(0, (yyvsp[0].nd));
                     }
-#line 6802 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6799 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 87:
-#line 2035 "mrbgems/mruby-compiler/core/parse.y"
+#line 2032 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list3(0, (yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 6810 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6807 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 88:
-#line 2039 "mrbgems/mruby-compiler/core/parse.y"
+#line 2036 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list2(0, new_nil(p));
                     }
-#line 6818 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6815 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 89:
-#line 2043 "mrbgems/mruby-compiler/core/parse.y"
+#line 2040 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list3(0, new_nil(p), (yyvsp[0].nd));
                     }
-#line 6826 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6823 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 91:
-#line 2050 "mrbgems/mruby-compiler/core/parse.y"
+#line 2047 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_masgn(p, (yyvsp[-1].nd), NULL);
                     }
-#line 6834 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6831 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 92:
-#line 2056 "mrbgems/mruby-compiler/core/parse.y"
+#line 2053 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1((yyvsp[-1].nd));
                     }
-#line 6842 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6839 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 93:
-#line 2060 "mrbgems/mruby-compiler/core/parse.y"
+#line 2057 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push((yyvsp[-2].nd), (yyvsp[-1].nd));
                     }
-#line 6850 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6847 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 94:
-#line 2066 "mrbgems/mruby-compiler/core/parse.y"
+#line 2063 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1((yyvsp[0].nd));
                     }
-#line 6858 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6855 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 95:
-#line 2070 "mrbgems/mruby-compiler/core/parse.y"
+#line 2067 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push((yyvsp[-1].nd), (yyvsp[0].nd));
                     }
-#line 6866 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6863 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 96:
-#line 2076 "mrbgems/mruby-compiler/core/parse.y"
+#line 2073 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       assignable(p, (yyvsp[0].nd));
                     }
-#line 6874 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6871 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 97:
-#line 2080 "mrbgems/mruby-compiler/core/parse.y"
+#line 2077 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-3].nd), intern_op(aref), (yyvsp[-1].nd), '.');
                     }
-#line 6882 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6879 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 98:
-#line 2084 "mrbgems/mruby-compiler/core/parse.y"
+#line 2081 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-2].nd), (yyvsp[0].id), 0, (yyvsp[-1].num));
                     }
-#line 6890 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6887 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 99:
-#line 2088 "mrbgems/mruby-compiler/core/parse.y"
+#line 2085 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-2].nd), (yyvsp[0].id), 0, tCOLON2);
                     }
-#line 6898 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6895 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 100:
-#line 2092 "mrbgems/mruby-compiler/core/parse.y"
+#line 2089 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-2].nd), (yyvsp[0].id), 0, (yyvsp[-1].num));
                     }
-#line 6906 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6903 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 101:
-#line 2096 "mrbgems/mruby-compiler/core/parse.y"
+#line 2093 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       if (p->in_def || p->in_single)
                         yyerror(p, "dynamic constant assignment");
                       (yyval.nd) = new_colon2(p, (yyvsp[-2].nd), (yyvsp[0].id));
                     }
-#line 6916 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6913 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 102:
-#line 2102 "mrbgems/mruby-compiler/core/parse.y"
+#line 2099 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       if (p->in_def || p->in_single)
                         yyerror(p, "dynamic constant assignment");
                       (yyval.nd) = new_colon3(p, (yyvsp[0].id));
                     }
-#line 6926 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6923 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 103:
-#line 2108 "mrbgems/mruby-compiler/core/parse.y"
+#line 2105 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       backref_error(p, (yyvsp[0].nd));
                       (yyval.nd) = 0;
                     }
-#line 6935 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6932 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 104:
-#line 2115 "mrbgems/mruby-compiler/core/parse.y"
+#line 2112 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       assignable(p, (yyvsp[0].nd));
                     }
-#line 6943 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6940 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 105:
-#line 2119 "mrbgems/mruby-compiler/core/parse.y"
+#line 2116 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-3].nd), intern_op(aref), (yyvsp[-1].nd), '.');
                     }
-#line 6951 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6948 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 106:
-#line 2123 "mrbgems/mruby-compiler/core/parse.y"
+#line 2120 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-2].nd), (yyvsp[0].id), 0, (yyvsp[-1].num));
                     }
-#line 6959 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6956 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 107:
-#line 2127 "mrbgems/mruby-compiler/core/parse.y"
+#line 2124 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-2].nd), (yyvsp[0].id), 0, tCOLON2);
                     }
-#line 6967 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6964 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 108:
-#line 2131 "mrbgems/mruby-compiler/core/parse.y"
+#line 2128 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-2].nd), (yyvsp[0].id), 0, (yyvsp[-1].num));
                     }
-#line 6975 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6972 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 109:
-#line 2135 "mrbgems/mruby-compiler/core/parse.y"
+#line 2132 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       if (p->in_def || p->in_single)
                         yyerror(p, "dynamic constant assignment");
                       (yyval.nd) = new_colon2(p, (yyvsp[-2].nd), (yyvsp[0].id));
                     }
-#line 6985 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6982 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 110:
-#line 2141 "mrbgems/mruby-compiler/core/parse.y"
+#line 2138 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       if (p->in_def || p->in_single)
                         yyerror(p, "dynamic constant assignment");
                       (yyval.nd) = new_colon3(p, (yyvsp[0].id));
                     }
-#line 6995 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 6992 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 111:
-#line 2147 "mrbgems/mruby-compiler/core/parse.y"
+#line 2144 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       backref_error(p, (yyvsp[0].nd));
                       (yyval.nd) = 0;
                     }
-#line 7004 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7001 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 112:
-#line 2152 "mrbgems/mruby-compiler/core/parse.y"
+#line 2149 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       yyerror(p, "can't assign to numbered parameter");
                     }
-#line 7012 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7009 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 113:
-#line 2158 "mrbgems/mruby-compiler/core/parse.y"
+#line 2155 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       yyerror(p, "class/module name must be CONSTANT");
                     }
-#line 7020 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7017 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 115:
-#line 2165 "mrbgems/mruby-compiler/core/parse.y"
+#line 2162 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = cons(nint(1), nsym((yyvsp[0].id)));
                     }
-#line 7028 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7025 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 116:
-#line 2169 "mrbgems/mruby-compiler/core/parse.y"
+#line 2166 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = cons(nint(0), nsym((yyvsp[0].id)));
                     }
-#line 7036 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7033 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 117:
-#line 2173 "mrbgems/mruby-compiler/core/parse.y"
+#line 2170 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       void_expr_error(p, (yyvsp[-2].nd));
                       (yyval.nd) = cons((yyvsp[-2].nd), nsym((yyvsp[0].id)));
                     }
-#line 7045 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7042 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 121:
-#line 2183 "mrbgems/mruby-compiler/core/parse.y"
+#line 2180 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       p->lstate = EXPR_ENDFN;
                       (yyval.id) = (yyvsp[0].id);
                     }
-#line 7054 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7051 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 122:
-#line 2188 "mrbgems/mruby-compiler/core/parse.y"
+#line 2185 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       p->lstate = EXPR_ENDFN;
                       (yyval.id) = (yyvsp[0].id);
                     }
-#line 7063 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7060 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 125:
-#line 2199 "mrbgems/mruby-compiler/core/parse.y"
+#line 2196 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_undef(p, (yyvsp[0].id));
                     }
-#line 7071 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7068 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 126:
-#line 2202 "mrbgems/mruby-compiler/core/parse.y"
+#line 2199 "mrbgems/mruby-compiler/core/parse.y"
                                  {p->lstate = EXPR_FNAME;}
-#line 7077 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7074 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 127:
-#line 2203 "mrbgems/mruby-compiler/core/parse.y"
+#line 2200 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push((yyvsp[-3].nd), nsym((yyvsp[0].id)));
                     }
-#line 7085 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7082 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 128:
-#line 2208 "mrbgems/mruby-compiler/core/parse.y"
+#line 2205 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(or);     }
-#line 7091 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7088 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 129:
-#line 2209 "mrbgems/mruby-compiler/core/parse.y"
+#line 2206 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(xor);    }
-#line 7097 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7094 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 130:
-#line 2210 "mrbgems/mruby-compiler/core/parse.y"
+#line 2207 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(and);    }
-#line 7103 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7100 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 131:
-#line 2211 "mrbgems/mruby-compiler/core/parse.y"
+#line 2208 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(cmp);    }
-#line 7109 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7106 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 132:
-#line 2212 "mrbgems/mruby-compiler/core/parse.y"
+#line 2209 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(eq);     }
-#line 7115 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7112 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 133:
-#line 2213 "mrbgems/mruby-compiler/core/parse.y"
+#line 2210 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(eqq);    }
-#line 7121 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7118 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 134:
-#line 2214 "mrbgems/mruby-compiler/core/parse.y"
+#line 2211 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(match);  }
-#line 7127 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7124 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 135:
-#line 2215 "mrbgems/mruby-compiler/core/parse.y"
+#line 2212 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(nmatch); }
-#line 7133 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7130 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 136:
-#line 2216 "mrbgems/mruby-compiler/core/parse.y"
+#line 2213 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(gt);     }
-#line 7139 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7136 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 137:
-#line 2217 "mrbgems/mruby-compiler/core/parse.y"
+#line 2214 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(ge);     }
-#line 7145 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7142 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 138:
-#line 2218 "mrbgems/mruby-compiler/core/parse.y"
+#line 2215 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(lt);     }
-#line 7151 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7148 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 139:
-#line 2219 "mrbgems/mruby-compiler/core/parse.y"
+#line 2216 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(le);     }
-#line 7157 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7154 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 140:
-#line 2220 "mrbgems/mruby-compiler/core/parse.y"
+#line 2217 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(neq);    }
-#line 7163 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7160 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 141:
-#line 2221 "mrbgems/mruby-compiler/core/parse.y"
+#line 2218 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(lshift); }
-#line 7169 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7166 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 142:
-#line 2222 "mrbgems/mruby-compiler/core/parse.y"
+#line 2219 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(rshift); }
-#line 7175 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7172 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 143:
-#line 2223 "mrbgems/mruby-compiler/core/parse.y"
+#line 2220 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(add);    }
-#line 7181 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7178 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 144:
-#line 2224 "mrbgems/mruby-compiler/core/parse.y"
+#line 2221 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(sub);    }
-#line 7187 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7184 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 145:
-#line 2225 "mrbgems/mruby-compiler/core/parse.y"
+#line 2222 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(mul);    }
-#line 7193 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7190 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 146:
-#line 2226 "mrbgems/mruby-compiler/core/parse.y"
+#line 2223 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(mul);    }
-#line 7199 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7196 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 147:
-#line 2227 "mrbgems/mruby-compiler/core/parse.y"
+#line 2224 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(div);    }
-#line 7205 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7202 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 148:
-#line 2228 "mrbgems/mruby-compiler/core/parse.y"
+#line 2225 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(mod);    }
-#line 7211 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7208 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 149:
-#line 2229 "mrbgems/mruby-compiler/core/parse.y"
+#line 2226 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(pow);    }
-#line 7217 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7214 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 150:
-#line 2230 "mrbgems/mruby-compiler/core/parse.y"
+#line 2227 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(pow);    }
-#line 7223 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7220 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 151:
-#line 2231 "mrbgems/mruby-compiler/core/parse.y"
+#line 2228 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(not);    }
-#line 7229 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7226 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 152:
-#line 2232 "mrbgems/mruby-compiler/core/parse.y"
+#line 2229 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(neg);    }
-#line 7235 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7232 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 153:
-#line 2233 "mrbgems/mruby-compiler/core/parse.y"
+#line 2230 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(plus);   }
-#line 7241 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7238 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 154:
-#line 2234 "mrbgems/mruby-compiler/core/parse.y"
+#line 2231 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(minus);  }
-#line 7247 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7244 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 155:
-#line 2235 "mrbgems/mruby-compiler/core/parse.y"
+#line 2232 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(aref);   }
-#line 7253 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7250 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 156:
-#line 2236 "mrbgems/mruby-compiler/core/parse.y"
+#line 2233 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(aset);   }
-#line 7259 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7256 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 157:
-#line 2237 "mrbgems/mruby-compiler/core/parse.y"
+#line 2234 "mrbgems/mruby-compiler/core/parse.y"
                                 { (yyval.id) = intern_op(tick);   }
-#line 7265 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7262 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 198:
-#line 2255 "mrbgems/mruby-compiler/core/parse.y"
+#line 2252 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_asgn(p, (yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 7273 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7270 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 199:
-#line 2259 "mrbgems/mruby-compiler/core/parse.y"
+#line 2256 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_op_asgn(p, (yyvsp[-2].nd), (yyvsp[-1].id), (yyvsp[0].nd));
                     }
-#line 7281 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7278 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 200:
-#line 2263 "mrbgems/mruby-compiler/core/parse.y"
+#line 2260 "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 7289 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7286 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 201:
-#line 2267 "mrbgems/mruby-compiler/core/parse.y"
+#line 2264 "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 7297 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7294 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 202:
-#line 2271 "mrbgems/mruby-compiler/core/parse.y"
+#line 2268 "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 7305 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7302 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 203:
-#line 2275 "mrbgems/mruby-compiler/core/parse.y"
+#line 2272 "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 7313 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7310 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 204:
-#line 2279 "mrbgems/mruby-compiler/core/parse.y"
+#line 2276 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       yyerror(p, "constant re-assignment");
                       (yyval.nd) = new_begin(p, 0);
                     }
-#line 7322 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7319 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 205:
-#line 2284 "mrbgems/mruby-compiler/core/parse.y"
+#line 2281 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       yyerror(p, "constant re-assignment");
                       (yyval.nd) = new_begin(p, 0);
                     }
-#line 7331 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7328 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 206:
-#line 2289 "mrbgems/mruby-compiler/core/parse.y"
+#line 2286 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       backref_error(p, (yyvsp[-2].nd));
                       (yyval.nd) = new_begin(p, 0);
                     }
-#line 7340 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7337 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 207:
-#line 2294 "mrbgems/mruby-compiler/core/parse.y"
+#line 2291 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_dot2(p, (yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 7348 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7345 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 208:
-#line 2298 "mrbgems/mruby-compiler/core/parse.y"
+#line 2295 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_dot2(p, (yyvsp[-1].nd), new_nil(p));
                     }
-#line 7356 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7353 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 209:
-#line 2302 "mrbgems/mruby-compiler/core/parse.y"
+#line 2299 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_dot2(p, new_nil(p), (yyvsp[0].nd));
                     }
-#line 7364 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7361 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 210:
-#line 2306 "mrbgems/mruby-compiler/core/parse.y"
+#line 2303 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_dot3(p, (yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 7372 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7369 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 211:
-#line 2310 "mrbgems/mruby-compiler/core/parse.y"
+#line 2307 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_dot3(p, (yyvsp[-1].nd), new_nil(p));
                     }
-#line 7380 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7377 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 212:
-#line 2314 "mrbgems/mruby-compiler/core/parse.y"
+#line 2311 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_dot3(p, new_nil(p), (yyvsp[0].nd));
                     }
-#line 7388 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7385 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 213:
-#line 2318 "mrbgems/mruby-compiler/core/parse.y"
+#line 2315 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "+", (yyvsp[0].nd));
                     }
-#line 7396 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7393 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 214:
-#line 2322 "mrbgems/mruby-compiler/core/parse.y"
+#line 2319 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "-", (yyvsp[0].nd));
                     }
-#line 7404 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7401 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 215:
-#line 2326 "mrbgems/mruby-compiler/core/parse.y"
+#line 2323 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "*", (yyvsp[0].nd));
                     }
-#line 7412 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7409 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 216:
-#line 2330 "mrbgems/mruby-compiler/core/parse.y"
+#line 2327 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "/", (yyvsp[0].nd));
                     }
-#line 7420 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7417 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 217:
-#line 2334 "mrbgems/mruby-compiler/core/parse.y"
+#line 2331 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "%", (yyvsp[0].nd));
                     }
-#line 7428 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7425 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 218:
-#line 2338 "mrbgems/mruby-compiler/core/parse.y"
+#line 2335 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "**", (yyvsp[0].nd));
                     }
-#line 7436 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7433 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 219:
-#line 2342 "mrbgems/mruby-compiler/core/parse.y"
+#line 2339 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_negate(p, call_bin_op(p, (yyvsp[-2].nd), "**", (yyvsp[0].nd)));
                     }
-#line 7444 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7441 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 220:
-#line 2346 "mrbgems/mruby-compiler/core/parse.y"
+#line 2343 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_negate(p, call_bin_op(p, (yyvsp[-2].nd), "**", (yyvsp[0].nd)));
                     }
-#line 7452 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7449 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 221:
-#line 2350 "mrbgems/mruby-compiler/core/parse.y"
+#line 2347 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_uni_op(p, (yyvsp[0].nd), "+@");
                     }
-#line 7460 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7457 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 222:
-#line 2354 "mrbgems/mruby-compiler/core/parse.y"
+#line 2351 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_negate(p, (yyvsp[0].nd));
                     }
-#line 7468 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7465 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 223:
-#line 2358 "mrbgems/mruby-compiler/core/parse.y"
+#line 2355 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "|", (yyvsp[0].nd));
                     }
-#line 7476 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7473 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 224:
-#line 2362 "mrbgems/mruby-compiler/core/parse.y"
+#line 2359 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "^", (yyvsp[0].nd));
                     }
-#line 7484 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7481 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 225:
-#line 2366 "mrbgems/mruby-compiler/core/parse.y"
+#line 2363 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "&", (yyvsp[0].nd));
                     }
-#line 7492 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7489 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 226:
-#line 2370 "mrbgems/mruby-compiler/core/parse.y"
+#line 2367 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "<=>", (yyvsp[0].nd));
                     }
-#line 7500 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7497 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 227:
-#line 2374 "mrbgems/mruby-compiler/core/parse.y"
+#line 2371 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), ">", (yyvsp[0].nd));
                     }
-#line 7508 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7505 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 228:
-#line 2378 "mrbgems/mruby-compiler/core/parse.y"
+#line 2375 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), ">=", (yyvsp[0].nd));
                     }
-#line 7516 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7513 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 229:
-#line 2382 "mrbgems/mruby-compiler/core/parse.y"
+#line 2379 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "<", (yyvsp[0].nd));
                     }
-#line 7524 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7521 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 230:
-#line 2386 "mrbgems/mruby-compiler/core/parse.y"
+#line 2383 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "<=", (yyvsp[0].nd));
                     }
-#line 7532 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7529 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 231:
-#line 2390 "mrbgems/mruby-compiler/core/parse.y"
+#line 2387 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "==", (yyvsp[0].nd));
                     }
-#line 7540 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7537 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 232:
-#line 2394 "mrbgems/mruby-compiler/core/parse.y"
+#line 2391 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "===", (yyvsp[0].nd));
                     }
-#line 7548 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7545 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 233:
-#line 2398 "mrbgems/mruby-compiler/core/parse.y"
+#line 2395 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "!=", (yyvsp[0].nd));
                     }
-#line 7556 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7553 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 234:
-#line 2402 "mrbgems/mruby-compiler/core/parse.y"
+#line 2399 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "=~", (yyvsp[0].nd));
                     }
-#line 7564 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7561 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 235:
-#line 2406 "mrbgems/mruby-compiler/core/parse.y"
+#line 2403 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "!~", (yyvsp[0].nd));
                     }
-#line 7572 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7569 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 236:
-#line 2410 "mrbgems/mruby-compiler/core/parse.y"
+#line 2407 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_uni_op(p, cond((yyvsp[0].nd)), "!");
                     }
-#line 7580 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7577 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 237:
-#line 2414 "mrbgems/mruby-compiler/core/parse.y"
+#line 2411 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_uni_op(p, cond((yyvsp[0].nd)), "~");
                     }
-#line 7588 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7585 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 238:
-#line 2418 "mrbgems/mruby-compiler/core/parse.y"
+#line 2415 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), "<<", (yyvsp[0].nd));
                     }
-#line 7596 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7593 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 239:
-#line 2422 "mrbgems/mruby-compiler/core/parse.y"
+#line 2419 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_bin_op(p, (yyvsp[-2].nd), ">>", (yyvsp[0].nd));
                     }
-#line 7604 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7601 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 240:
-#line 2426 "mrbgems/mruby-compiler/core/parse.y"
+#line 2423 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_and(p, (yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 7612 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7609 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 241:
-#line 2430 "mrbgems/mruby-compiler/core/parse.y"
+#line 2427 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_or(p, (yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 7620 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7617 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 242:
-#line 2434 "mrbgems/mruby-compiler/core/parse.y"
+#line 2431 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_if(p, cond((yyvsp[-5].nd)), (yyvsp[-3].nd), (yyvsp[0].nd));
                     }
-#line 7628 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7625 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 243:
-#line 2438 "mrbgems/mruby-compiler/core/parse.y"
+#line 2435 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_if(p, cond((yyvsp[-5].nd)), (yyvsp[-3].nd), (yyvsp[0].nd));
                     }
-#line 7636 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7633 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 244:
-#line 2442 "mrbgems/mruby-compiler/core/parse.y"
+#line 2439 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-3].nd);
                       endless_method_name(p, (yyvsp[-3].nd));
@@ -7645,11 +7642,11 @@ yyreduce:
                       nvars_unnest(p);
                       p->in_def--;
                     }
-#line 7649 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7646 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 245:
-#line 2451 "mrbgems/mruby-compiler/core/parse.y"
+#line 2448 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-5].nd);
                       endless_method_name(p, (yyvsp[-5].nd));
@@ -7658,11 +7655,11 @@ yyreduce:
                       nvars_unnest(p);
                       p->in_def--;
                     }
-#line 7662 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7659 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 246:
-#line 2460 "mrbgems/mruby-compiler/core/parse.y"
+#line 2457 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-3].nd);
                       void_expr_error(p, (yyvsp[0].nd));
@@ -7671,11 +7668,11 @@ yyreduce:
                       p->in_def--;
                       p->in_single--;
                     }
-#line 7675 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7672 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 247:
-#line 2469 "mrbgems/mruby-compiler/core/parse.y"
+#line 2466 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-5].nd);
                       void_expr_error(p, (yyvsp[-2].nd));
@@ -7684,70 +7681,70 @@ yyreduce:
                       p->in_def--;
                       p->in_single--;
                     }
-#line 7688 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7685 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 248:
-#line 2478 "mrbgems/mruby-compiler/core/parse.y"
+#line 2475 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[0].nd);
                     }
-#line 7696 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7693 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 250:
-#line 2485 "mrbgems/mruby-compiler/core/parse.y"
+#line 2482 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-1].nd);
                       NODE_LINENO((yyval.nd), (yyvsp[-1].nd));
                     }
-#line 7705 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7702 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 251:
-#line 2490 "mrbgems/mruby-compiler/core/parse.y"
+#line 2487 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push((yyvsp[-3].nd), new_hash(p, (yyvsp[-1].nd)));
                     }
-#line 7713 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7710 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 252:
-#line 2494 "mrbgems/mruby-compiler/core/parse.y"
+#line 2491 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = cons(new_kw_hash(p, (yyvsp[-1].nd)), 0);
                       NODE_LINENO((yyval.nd), (yyvsp[-1].nd));
                     }
-#line 7722 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7719 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 253:
-#line 2501 "mrbgems/mruby-compiler/core/parse.y"
+#line 2498 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[0].nd);
                     }
-#line 7730 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7727 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 254:
-#line 2505 "mrbgems/mruby-compiler/core/parse.y"
+#line 2502 "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 7739 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7736 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 255:
-#line 2512 "mrbgems/mruby-compiler/core/parse.y"
+#line 2509 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-1].nd);
                     }
-#line 7747 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7744 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 256:
-#line 2516 "mrbgems/mruby-compiler/core/parse.y"
+#line 2513 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       mrb_sym r = intern_op(mul);
                       mrb_sym k = intern_op(pow);
@@ -7756,11 +7753,11 @@ 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 7760 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7757 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 257:
-#line 2525 "mrbgems/mruby-compiler/core/parse.y"
+#line 2522 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       mrb_sym r = intern_op(mul);
                       mrb_sym k = intern_op(pow);
@@ -7775,529 +7772,529 @@ yyreduce:
                         (yyval.nd) = 0;
                       }
                     }
-#line 7779 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7776 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 262:
-#line 2548 "mrbgems/mruby-compiler/core/parse.y"
+#line 2545 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_callargs(p,(yyvsp[-1].nd),0,0);
                       NODE_LINENO((yyval.nd), (yyvsp[-1].nd));
                     }
-#line 7788 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7785 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 263:
-#line 2553 "mrbgems/mruby-compiler/core/parse.y"
+#line 2550 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_callargs(p,(yyvsp[-3].nd),new_kw_hash(p,(yyvsp[-1].nd)),0);
                       NODE_LINENO((yyval.nd), (yyvsp[-3].nd));
                     }
-#line 7797 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7794 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 264:
-#line 2558 "mrbgems/mruby-compiler/core/parse.y"
+#line 2555 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_callargs(p,0,new_kw_hash(p,(yyvsp[-1].nd)),0);
                       NODE_LINENO((yyval.nd), (yyvsp[-1].nd));
                     }
-#line 7806 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7803 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 265:
-#line 2565 "mrbgems/mruby-compiler/core/parse.y"
+#line 2562 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       void_expr_error(p, (yyvsp[0].nd));
                       (yyval.nd) = new_callargs(p, list1((yyvsp[0].nd)), 0, 0);
                       NODE_LINENO((yyval.nd), (yyvsp[0].nd));
                     }
-#line 7816 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7813 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 266:
-#line 2571 "mrbgems/mruby-compiler/core/parse.y"
+#line 2568 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_callargs(p, (yyvsp[-1].nd), 0, (yyvsp[0].nd));
                       NODE_LINENO((yyval.nd), (yyvsp[-1].nd));
                     }
-#line 7825 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7822 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 267:
-#line 2576 "mrbgems/mruby-compiler/core/parse.y"
+#line 2573 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_callargs(p, 0, new_kw_hash(p, (yyvsp[-1].nd)), (yyvsp[0].nd));
                       NODE_LINENO((yyval.nd), (yyvsp[-1].nd));
                     }
-#line 7834 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7831 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 268:
-#line 2581 "mrbgems/mruby-compiler/core/parse.y"
+#line 2578 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_callargs(p, (yyvsp[-3].nd), new_kw_hash(p, (yyvsp[-1].nd)), (yyvsp[0].nd));
                       NODE_LINENO((yyval.nd), (yyvsp[-3].nd));
                     }
-#line 7843 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7840 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 269:
-#line 2586 "mrbgems/mruby-compiler/core/parse.y"
+#line 2583 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_callargs(p, 0, 0, (yyvsp[0].nd));
                       NODE_LINENO((yyval.nd), (yyvsp[0].nd));
                     }
-#line 7852 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7849 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 270:
-#line 2592 "mrbgems/mruby-compiler/core/parse.y"
+#line 2589 "mrbgems/mruby-compiler/core/parse.y"
                    {
                       (yyval.stack) = p->cmdarg_stack;
                       CMDARG_PUSH(1);
                     }
-#line 7861 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7858 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 271:
-#line 2597 "mrbgems/mruby-compiler/core/parse.y"
+#line 2594 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       p->cmdarg_stack = (yyvsp[-1].stack);
                       (yyval.nd) = (yyvsp[0].nd);
                     }
-#line 7870 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7867 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 272:
-#line 2604 "mrbgems/mruby-compiler/core/parse.y"
+#line 2601 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_block_arg(p, (yyvsp[0].nd));
                     }
-#line 7878 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7875 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 273:
-#line 2608 "mrbgems/mruby-compiler/core/parse.y"
+#line 2605 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_block_arg(p, 0);
                     }
-#line 7886 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7883 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 274:
-#line 2614 "mrbgems/mruby-compiler/core/parse.y"
+#line 2611 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[0].nd);
                     }
-#line 7894 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7891 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 275:
-#line 2618 "mrbgems/mruby-compiler/core/parse.y"
+#line 2615 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = 0;
                     }
-#line 7902 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7899 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 277:
-#line 2627 "mrbgems/mruby-compiler/core/parse.y"
+#line 2624 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       void_expr_error(p, (yyvsp[0].nd));
                       (yyval.nd) = list1((yyvsp[0].nd));
                       NODE_LINENO((yyval.nd), (yyvsp[0].nd));
                     }
-#line 7912 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7909 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 278:
-#line 2633 "mrbgems/mruby-compiler/core/parse.y"
+#line 2630 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1(new_splat(p, (yyvsp[0].nd)));
                       NODE_LINENO((yyval.nd), (yyvsp[0].nd));
                     }
-#line 7921 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7918 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 279:
-#line 2638 "mrbgems/mruby-compiler/core/parse.y"
+#line 2635 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       void_expr_error(p, (yyvsp[0].nd));
                       (yyval.nd) = push((yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 7930 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7927 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 280:
-#line 2643 "mrbgems/mruby-compiler/core/parse.y"
+#line 2640 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push((yyvsp[-3].nd), new_splat(p, (yyvsp[0].nd)));
                     }
-#line 7938 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7935 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 281:
-#line 2649 "mrbgems/mruby-compiler/core/parse.y"
+#line 2646 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       void_expr_error(p, (yyvsp[0].nd));
                       (yyval.nd) = push((yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 7947 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7944 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 282:
-#line 2654 "mrbgems/mruby-compiler/core/parse.y"
+#line 2651 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push((yyvsp[-3].nd), new_splat(p, (yyvsp[0].nd)));
                     }
-#line 7955 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7952 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 283:
-#line 2658 "mrbgems/mruby-compiler/core/parse.y"
+#line 2655 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1(new_splat(p, (yyvsp[0].nd)));
                     }
-#line 7963 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7960 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 291:
-#line 2671 "mrbgems/mruby-compiler/core/parse.y"
+#line 2668 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_nvar(p, (yyvsp[0].num));
                     }
-#line 7971 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7968 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 292:
-#line 2675 "mrbgems/mruby-compiler/core/parse.y"
+#line 2672 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_fcall(p, (yyvsp[0].id), 0);
                     }
-#line 7979 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7976 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 293:
-#line 2679 "mrbgems/mruby-compiler/core/parse.y"
+#line 2676 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.stack) = p->cmdarg_stack;
                       p->cmdarg_stack = 0;
                     }
-#line 7988 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7985 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 294:
-#line 2685 "mrbgems/mruby-compiler/core/parse.y"
+#line 2682 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       p->cmdarg_stack = (yyvsp[-2].stack);
                       (yyval.nd) = (yyvsp[-1].nd);
                     }
-#line 7997 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 7994 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 295:
-#line 2690 "mrbgems/mruby-compiler/core/parse.y"
+#line 2687 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.stack) = p->cmdarg_stack;
                       p->cmdarg_stack = 0;
                     }
-#line 8006 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8003 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 296:
-#line 2694 "mrbgems/mruby-compiler/core/parse.y"
+#line 2691 "mrbgems/mruby-compiler/core/parse.y"
                        {p->lstate = EXPR_ENDARG;}
-#line 8012 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8009 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 297:
-#line 2695 "mrbgems/mruby-compiler/core/parse.y"
+#line 2692 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       p->cmdarg_stack = (yyvsp[-3].stack);
                       (yyval.nd) = (yyvsp[-2].nd);
                     }
-#line 8021 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8018 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 298:
-#line 2699 "mrbgems/mruby-compiler/core/parse.y"
+#line 2696 "mrbgems/mruby-compiler/core/parse.y"
                               {p->lstate = EXPR_ENDARG;}
-#line 8027 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8024 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 299:
-#line 2700 "mrbgems/mruby-compiler/core/parse.y"
+#line 2697 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_nil(p);
                     }
-#line 8035 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8032 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 300:
-#line 2704 "mrbgems/mruby-compiler/core/parse.y"
+#line 2701 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-1].nd);
                     }
-#line 8043 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8040 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 301:
-#line 2708 "mrbgems/mruby-compiler/core/parse.y"
+#line 2705 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_colon2(p, (yyvsp[-2].nd), (yyvsp[0].id));
                     }
-#line 8051 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8048 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 302:
-#line 2712 "mrbgems/mruby-compiler/core/parse.y"
+#line 2709 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_colon3(p, (yyvsp[0].id));
                     }
-#line 8059 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8056 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 303:
-#line 2716 "mrbgems/mruby-compiler/core/parse.y"
+#line 2713 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_array(p, (yyvsp[-1].nd));
                       NODE_LINENO((yyval.nd), (yyvsp[-1].nd));
                     }
-#line 8068 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8065 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 304:
-#line 2721 "mrbgems/mruby-compiler/core/parse.y"
+#line 2718 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_hash(p, (yyvsp[-1].nd));
                       NODE_LINENO((yyval.nd), (yyvsp[-1].nd));
                     }
-#line 8077 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8074 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 305:
-#line 2726 "mrbgems/mruby-compiler/core/parse.y"
+#line 2723 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_return(p, 0);
                     }
-#line 8085 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8082 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 306:
-#line 2730 "mrbgems/mruby-compiler/core/parse.y"
+#line 2727 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_yield(p, (yyvsp[0].nd));
                     }
-#line 8093 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8090 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 307:
-#line 2734 "mrbgems/mruby-compiler/core/parse.y"
+#line 2731 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_uni_op(p, cond((yyvsp[-1].nd)), "!");
                     }
-#line 8101 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8098 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 308:
-#line 2738 "mrbgems/mruby-compiler/core/parse.y"
+#line 2735 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = call_uni_op(p, new_nil(p), "!");
                     }
-#line 8109 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8106 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 309:
-#line 2742 "mrbgems/mruby-compiler/core/parse.y"
+#line 2739 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_fcall(p, (yyvsp[-1].id), new_callargs(p, 0, 0, (yyvsp[0].nd)));
                     }
-#line 8117 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8114 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 311:
-#line 2747 "mrbgems/mruby-compiler/core/parse.y"
+#line 2744 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       call_with_block(p, (yyvsp[-1].nd), (yyvsp[0].nd));
                       (yyval.nd) = (yyvsp[-1].nd);
                     }
-#line 8126 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8123 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 312:
-#line 2752 "mrbgems/mruby-compiler/core/parse.y"
+#line 2749 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       local_nest(p);
-                      //                      nvars_nest(p);
+                      nvars_nest(p);
                       (yyval.num) = p->lpar_beg;
                       p->lpar_beg = ++p->paren_nest;
                     }
-#line 8137 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8134 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 313:
-#line 2759 "mrbgems/mruby-compiler/core/parse.y"
+#line 2756 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.stack) = p->cmdarg_stack;
                       p->cmdarg_stack = 0;
                     }
-#line 8146 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8143 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 314:
-#line 2764 "mrbgems/mruby-compiler/core/parse.y"
+#line 2761 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       p->lpar_beg = (yyvsp[-3].num);
                       (yyval.nd) = new_lambda(p, (yyvsp[-2].nd), (yyvsp[0].nd));
                       local_unnest(p);
-                      //                      nvars_unnest(p);
+                      nvars_unnest(p);
                       p->cmdarg_stack = (yyvsp[-1].stack);
                       CMDARG_LEXPOP();
                     }
-#line 8159 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8156 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 315:
-#line 2776 "mrbgems/mruby-compiler/core/parse.y"
+#line 2773 "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 8168 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8165 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 316:
-#line 2784 "mrbgems/mruby-compiler/core/parse.y"
+#line 2781 "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 8177 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8174 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 317:
-#line 2788 "mrbgems/mruby-compiler/core/parse.y"
+#line 2785 "mrbgems/mruby-compiler/core/parse.y"
                                 {COND_PUSH(1);}
-#line 8183 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8180 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 318:
-#line 2788 "mrbgems/mruby-compiler/core/parse.y"
+#line 2785 "mrbgems/mruby-compiler/core/parse.y"
                                                               {COND_POP();}
-#line 8189 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8186 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 319:
-#line 2791 "mrbgems/mruby-compiler/core/parse.y"
+#line 2788 "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 8198 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8195 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 320:
-#line 2795 "mrbgems/mruby-compiler/core/parse.y"
+#line 2792 "mrbgems/mruby-compiler/core/parse.y"
                                 {COND_PUSH(1);}
-#line 8204 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8201 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 321:
-#line 2795 "mrbgems/mruby-compiler/core/parse.y"
+#line 2792 "mrbgems/mruby-compiler/core/parse.y"
                                                               {COND_POP();}
-#line 8210 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8207 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 322:
-#line 2798 "mrbgems/mruby-compiler/core/parse.y"
+#line 2795 "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 8219 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8216 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 323:
-#line 2805 "mrbgems/mruby-compiler/core/parse.y"
+#line 2802 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_case(p, (yyvsp[-3].nd), (yyvsp[-1].nd));
                     }
-#line 8227 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8224 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 324:
-#line 2809 "mrbgems/mruby-compiler/core/parse.y"
+#line 2806 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_case(p, 0, (yyvsp[-1].nd));
                     }
-#line 8235 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8232 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 325:
-#line 2813 "mrbgems/mruby-compiler/core/parse.y"
+#line 2810 "mrbgems/mruby-compiler/core/parse.y"
                   {COND_PUSH(1);}
-#line 8241 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8238 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 326:
-#line 2815 "mrbgems/mruby-compiler/core/parse.y"
+#line 2812 "mrbgems/mruby-compiler/core/parse.y"
                   {COND_POP();}
-#line 8247 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8244 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 327:
-#line 2818 "mrbgems/mruby-compiler/core/parse.y"
+#line 2815 "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 8256 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8253 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 328:
-#line 2824 "mrbgems/mruby-compiler/core/parse.y"
+#line 2821 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       if (p->in_def || p->in_single)
                         yyerror(p, "class definition in method body");
                       (yyval.nd) = local_switch(p);
                       nvars_block(p);
                     }
-#line 8267 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8264 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 329:
-#line 2832 "mrbgems/mruby-compiler/core/parse.y"
+#line 2829 "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 8278 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8275 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 330:
-#line 2840 "mrbgems/mruby-compiler/core/parse.y"
+#line 2837 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.num) = p->in_def;
                       p->in_def = 0;
                     }
-#line 8287 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8284 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 331:
-#line 2845 "mrbgems/mruby-compiler/core/parse.y"
+#line 2842 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = cons(local_switch(p), nint(p->in_single));
                       nvars_block(p);
                       p->in_single = 0;
                     }
-#line 8297 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8294 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 332:
-#line 2852 "mrbgems/mruby-compiler/core/parse.y"
+#line 2849 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_sclass(p, (yyvsp[-5].nd), (yyvsp[-1].nd));
                       SET_LINENO((yyval.nd), (yyvsp[-7].num));
@@ -8306,44 +8303,44 @@ yyreduce:
                       p->in_def = (yyvsp[-4].num);
                       p->in_single = intn((yyvsp[-2].nd)->cdr);
                     }
-#line 8310 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8307 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 333:
-#line 2862 "mrbgems/mruby-compiler/core/parse.y"
+#line 2859 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       if (p->in_def || p->in_single)
                         yyerror(p, "module definition in method body");
                       (yyval.nd) = local_switch(p);
                       nvars_block(p);
                     }
-#line 8321 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8318 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 334:
-#line 2870 "mrbgems/mruby-compiler/core/parse.y"
+#line 2867 "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 8332 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8329 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 335:
-#line 2880 "mrbgems/mruby-compiler/core/parse.y"
+#line 2877 "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 8343 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8340 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 336:
-#line 2890 "mrbgems/mruby-compiler/core/parse.y"
+#line 2887 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-3].nd);
                       defs_setup(p, (yyval.nd), (yyvsp[-2].nd), (yyvsp[-1].nd));
@@ -8351,441 +8348,441 @@ yyreduce:
                       p->in_def--;
                       p->in_single--;
                     }
-#line 8355 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8352 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 337:
-#line 2898 "mrbgems/mruby-compiler/core/parse.y"
+#line 2895 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_break(p, 0);
                     }
-#line 8363 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8360 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 338:
-#line 2902 "mrbgems/mruby-compiler/core/parse.y"
+#line 2899 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_next(p, 0);
                     }
-#line 8371 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8368 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 339:
-#line 2906 "mrbgems/mruby-compiler/core/parse.y"
+#line 2903 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_redo(p);
                     }
-#line 8379 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8376 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 340:
-#line 2910 "mrbgems/mruby-compiler/core/parse.y"
+#line 2907 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_retry(p);
                     }
-#line 8387 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8384 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 341:
-#line 2916 "mrbgems/mruby-compiler/core/parse.y"
+#line 2913 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[0].nd);
                       if (!(yyval.nd)) (yyval.nd) = new_nil(p);
                     }
-#line 8396 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8393 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 348:
-#line 2935 "mrbgems/mruby-compiler/core/parse.y"
+#line 2932 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_if(p, cond((yyvsp[-3].nd)), (yyvsp[-1].nd), (yyvsp[0].nd));
                     }
-#line 8404 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8401 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 350:
-#line 2942 "mrbgems/mruby-compiler/core/parse.y"
+#line 2939 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[0].nd);
                     }
-#line 8412 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8409 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 351:
-#line 2948 "mrbgems/mruby-compiler/core/parse.y"
+#line 2945 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1(list1((yyvsp[0].nd)));
                     }
-#line 8420 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8417 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 353:
-#line 2955 "mrbgems/mruby-compiler/core/parse.y"
+#line 2952 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list3((yyvsp[0].nd),0,0);
                     }
-#line 8428 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8425 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 354:
-#line 2959 "mrbgems/mruby-compiler/core/parse.y"
+#line 2956 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list3((yyvsp[-3].nd), new_arg(p, (yyvsp[0].id)), 0);
                     }
-#line 8436 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8433 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 355:
-#line 2963 "mrbgems/mruby-compiler/core/parse.y"
+#line 2960 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list3((yyvsp[-5].nd), new_arg(p, (yyvsp[-2].id)), (yyvsp[0].nd));
                     }
-#line 8444 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8441 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 356:
-#line 2967 "mrbgems/mruby-compiler/core/parse.y"
+#line 2964 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list3((yyvsp[-2].nd), nint(-1), 0);
                     }
-#line 8452 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8449 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 357:
-#line 2971 "mrbgems/mruby-compiler/core/parse.y"
+#line 2968 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list3((yyvsp[-4].nd), nint(-1), (yyvsp[0].nd));
                     }
-#line 8460 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8457 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 358:
-#line 2975 "mrbgems/mruby-compiler/core/parse.y"
+#line 2972 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list3(0, new_arg(p, (yyvsp[0].id)), 0);
                     }
-#line 8468 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8465 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 359:
-#line 2979 "mrbgems/mruby-compiler/core/parse.y"
+#line 2976 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list3(0, new_arg(p, (yyvsp[-2].id)), (yyvsp[0].nd));
                     }
-#line 8476 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8473 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 360:
-#line 2983 "mrbgems/mruby-compiler/core/parse.y"
+#line 2980 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list3(0, nint(-1), 0);
                     }
-#line 8484 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8481 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 361:
-#line 2987 "mrbgems/mruby-compiler/core/parse.y"
+#line 2984 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list3(0, nint(-1), (yyvsp[0].nd));
                     }
-#line 8492 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8489 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 362:
-#line 2993 "mrbgems/mruby-compiler/core/parse.y"
+#line 2990 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args_tail(p, (yyvsp[-3].nd), (yyvsp[-1].nd), (yyvsp[0].id));
                     }
-#line 8500 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8497 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 363:
-#line 2997 "mrbgems/mruby-compiler/core/parse.y"
+#line 2994 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args_tail(p, (yyvsp[-1].nd), 0, (yyvsp[0].id));
                     }
-#line 8508 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8505 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 364:
-#line 3001 "mrbgems/mruby-compiler/core/parse.y"
+#line 2998 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args_tail(p, 0, (yyvsp[-1].nd), (yyvsp[0].id));
                     }
-#line 8516 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8513 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 365:
-#line 3005 "mrbgems/mruby-compiler/core/parse.y"
+#line 3002 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args_tail(p, 0, 0, (yyvsp[0].id));
                     }
-#line 8524 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8521 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 366:
-#line 3011 "mrbgems/mruby-compiler/core/parse.y"
+#line 3008 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[0].nd);
                     }
-#line 8532 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8529 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 367:
-#line 3015 "mrbgems/mruby-compiler/core/parse.y"
+#line 3012 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args_tail(p, 0, 0, 0);
                     }
-#line 8540 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8537 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 368:
-#line 3021 "mrbgems/mruby-compiler/core/parse.y"
+#line 3018 "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 8548 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8545 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 369:
-#line 3025 "mrbgems/mruby-compiler/core/parse.y"
+#line 3022 "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 8556 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8553 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 370:
-#line 3029 "mrbgems/mruby-compiler/core/parse.y"
+#line 3026 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, (yyvsp[-3].nd), (yyvsp[-1].nd), 0, 0, (yyvsp[0].nd));
                     }
-#line 8564 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8561 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 371:
-#line 3033 "mrbgems/mruby-compiler/core/parse.y"
+#line 3030 "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 8572 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8569 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 372:
-#line 3037 "mrbgems/mruby-compiler/core/parse.y"
+#line 3034 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, (yyvsp[-3].nd), 0, (yyvsp[-1].id), 0, (yyvsp[0].nd));
                     }
-#line 8580 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8577 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 373:
-#line 3041 "mrbgems/mruby-compiler/core/parse.y"
+#line 3038 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, (yyvsp[-2].nd), 0, 0, 0, (yyvsp[0].nd));
                     }
-#line 8588 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8585 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 374:
-#line 3045 "mrbgems/mruby-compiler/core/parse.y"
+#line 3042 "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 8596 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8593 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 375:
-#line 3049 "mrbgems/mruby-compiler/core/parse.y"
+#line 3046 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, (yyvsp[-1].nd), 0, 0, 0, (yyvsp[0].nd));
                     }
-#line 8604 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8601 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 376:
-#line 3053 "mrbgems/mruby-compiler/core/parse.y"
+#line 3050 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, 0, (yyvsp[-3].nd), (yyvsp[-1].id), 0, (yyvsp[0].nd));
                     }
-#line 8612 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8609 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 377:
-#line 3057 "mrbgems/mruby-compiler/core/parse.y"
+#line 3054 "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 8620 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8617 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 378:
-#line 3061 "mrbgems/mruby-compiler/core/parse.y"
+#line 3058 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, 0, (yyvsp[-1].nd), 0, 0, (yyvsp[0].nd));
                     }
-#line 8628 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8625 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 379:
-#line 3065 "mrbgems/mruby-compiler/core/parse.y"
+#line 3062 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, 0, (yyvsp[-3].nd), 0, (yyvsp[-1].nd), (yyvsp[0].nd));
                     }
-#line 8636 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8633 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 380:
-#line 3069 "mrbgems/mruby-compiler/core/parse.y"
+#line 3066 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, 0, 0, (yyvsp[-1].id), 0, (yyvsp[0].nd));
                     }
-#line 8644 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8641 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 381:
-#line 3073 "mrbgems/mruby-compiler/core/parse.y"
+#line 3070 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, 0, 0, (yyvsp[-3].id), (yyvsp[-1].nd), (yyvsp[0].nd));
                     }
-#line 8652 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8649 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 382:
-#line 3077 "mrbgems/mruby-compiler/core/parse.y"
+#line 3074 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, 0, 0, 0, 0, (yyvsp[0].nd));
                     }
-#line 8660 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8657 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 383:
-#line 3083 "mrbgems/mruby-compiler/core/parse.y"
+#line 3080 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       local_add_blk(p, 0);
                       (yyval.nd) = 0;
                     }
-#line 8669 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8666 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 384:
-#line 3088 "mrbgems/mruby-compiler/core/parse.y"
+#line 3085 "mrbgems/mruby-compiler/core/parse.y"
                    {
                       p->cmd_start = TRUE;
                       (yyval.nd) = (yyvsp[0].nd);
                     }
-#line 8678 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8675 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 385:
-#line 3094 "mrbgems/mruby-compiler/core/parse.y"
+#line 3091 "mrbgems/mruby-compiler/core/parse.y"
                       {local_add_blk(p, 0);}
-#line 8684 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8681 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 386:
-#line 3095 "mrbgems/mruby-compiler/core/parse.y"
+#line 3092 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = 0;
                     }
-#line 8692 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8689 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 387:
-#line 3099 "mrbgems/mruby-compiler/core/parse.y"
+#line 3096 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       local_add_blk(p, 0);
                       (yyval.nd) = 0;
                     }
-#line 8701 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8698 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 388:
-#line 3104 "mrbgems/mruby-compiler/core/parse.y"
+#line 3101 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-2].nd);
                     }
-#line 8709 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8706 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 389:
-#line 3111 "mrbgems/mruby-compiler/core/parse.y"
+#line 3108 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = 0;
                     }
-#line 8717 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8714 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 390:
-#line 3115 "mrbgems/mruby-compiler/core/parse.y"
+#line 3112 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = 0;
                     }
-#line 8725 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8722 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 393:
-#line 3125 "mrbgems/mruby-compiler/core/parse.y"
+#line 3122 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       local_add_f(p, (yyvsp[0].id));
                       new_bv(p, (yyvsp[0].id));
                     }
-#line 8734 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8731 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 395:
-#line 3133 "mrbgems/mruby-compiler/core/parse.y"
+#line 3130 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-2].nd);
                     }
-#line 8742 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8739 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 396:
-#line 3137 "mrbgems/mruby-compiler/core/parse.y"
+#line 3134 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[0].nd);
                     }
-#line 8750 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8747 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 397:
-#line 3143 "mrbgems/mruby-compiler/core/parse.y"
+#line 3140 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-1].nd);
                     }
-#line 8758 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8755 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 398:
-#line 3147 "mrbgems/mruby-compiler/core/parse.y"
+#line 3144 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-1].nd);
                     }
-#line 8766 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8763 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 399:
-#line 3153 "mrbgems/mruby-compiler/core/parse.y"
+#line 3150 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       local_nest(p);
                       nvars_nest(p);
                     }
-#line 8775 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8772 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 400:
-#line 3160 "mrbgems/mruby-compiler/core/parse.y"
+#line 3157 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_block(p,(yyvsp[-2].nd),(yyvsp[-1].nd));
                       local_unnest(p);
                       nvars_unnest(p);
                     }
-#line 8785 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8782 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 401:
-#line 3168 "mrbgems/mruby-compiler/core/parse.y"
+#line 3165 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       if (typen((yyvsp[-1].nd)->car) == NODE_YIELD) {
                         yyerror(p, "block given to yield");
@@ -8795,159 +8792,159 @@ yyreduce:
                       }
                       (yyval.nd) = (yyvsp[-1].nd);
                     }
-#line 8799 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8796 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 402:
-#line 3178 "mrbgems/mruby-compiler/core/parse.y"
+#line 3175 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-3].nd), (yyvsp[-1].id), (yyvsp[0].nd), (yyvsp[-2].num));
                     }
-#line 8807 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8804 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 403:
-#line 3182 "mrbgems/mruby-compiler/core/parse.y"
+#line 3179 "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 8816 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8813 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 404:
-#line 3187 "mrbgems/mruby-compiler/core/parse.y"
+#line 3184 "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 8825 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8822 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 405:
-#line 3194 "mrbgems/mruby-compiler/core/parse.y"
+#line 3191 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_fcall(p, (yyvsp[-1].id), (yyvsp[0].nd));
                     }
-#line 8833 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8830 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 406:
-#line 3198 "mrbgems/mruby-compiler/core/parse.y"
+#line 3195 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-3].nd), (yyvsp[-1].id), (yyvsp[0].nd), (yyvsp[-2].num));
                     }
-#line 8841 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8838 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 407:
-#line 3202 "mrbgems/mruby-compiler/core/parse.y"
+#line 3199 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-3].nd), (yyvsp[-1].id), (yyvsp[0].nd), tCOLON2);
                     }
-#line 8849 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8846 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 408:
-#line 3206 "mrbgems/mruby-compiler/core/parse.y"
+#line 3203 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-2].nd), (yyvsp[0].id), 0, tCOLON2);
                     }
-#line 8857 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8854 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 409:
-#line 3210 "mrbgems/mruby-compiler/core/parse.y"
+#line 3207 "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 8865 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8862 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 410:
-#line 3214 "mrbgems/mruby-compiler/core/parse.y"
+#line 3211 "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 8873 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8870 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 411:
-#line 3218 "mrbgems/mruby-compiler/core/parse.y"
+#line 3215 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_super(p, (yyvsp[0].nd));
                     }
-#line 8881 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8878 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 412:
-#line 3222 "mrbgems/mruby-compiler/core/parse.y"
+#line 3219 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_zsuper(p);
                     }
-#line 8889 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8886 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 413:
-#line 3226 "mrbgems/mruby-compiler/core/parse.y"
+#line 3223 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_call(p, (yyvsp[-3].nd), intern_op(aref), (yyvsp[-1].nd), '.');
                     }
-#line 8897 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8894 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 414:
-#line 3232 "mrbgems/mruby-compiler/core/parse.y"
+#line 3229 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       local_nest(p);
                       nvars_nest(p);
                       (yyval.num) = p->lineno;
                     }
-#line 8907 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8904 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 415:
-#line 3239 "mrbgems/mruby-compiler/core/parse.y"
+#line 3236 "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 8918 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8915 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 416:
-#line 3246 "mrbgems/mruby-compiler/core/parse.y"
+#line 3243 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       local_nest(p);
                       nvars_nest(p);
                       (yyval.num) = p->lineno;
                     }
-#line 8928 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8925 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 417:
-#line 3253 "mrbgems/mruby-compiler/core/parse.y"
+#line 3250 "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 8939 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8936 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 418:
-#line 3264 "mrbgems/mruby-compiler/core/parse.y"
+#line 3261 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = cons(cons((yyvsp[-3].nd), (yyvsp[-1].nd)), (yyvsp[0].nd));
                     }
-#line 8947 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8944 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 419:
-#line 3270 "mrbgems/mruby-compiler/core/parse.y"
+#line 3267 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       if ((yyvsp[0].nd)) {
                         (yyval.nd) = cons(cons(0, (yyvsp[0].nd)), 0);
@@ -8956,60 +8953,60 @@ yyreduce:
                         (yyval.nd) = 0;
                       }
                     }
-#line 8960 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8957 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 421:
-#line 3284 "mrbgems/mruby-compiler/core/parse.y"
+#line 3281 "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 8969 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8966 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 423:
-#line 3292 "mrbgems/mruby-compiler/core/parse.y"
+#line 3289 "mrbgems/mruby-compiler/core/parse.y"
                     {
                         (yyval.nd) = list1((yyvsp[0].nd));
                     }
-#line 8977 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8974 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 426:
-#line 3300 "mrbgems/mruby-compiler/core/parse.y"
+#line 3297 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[0].nd);
                     }
-#line 8985 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8982 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 428:
-#line 3307 "mrbgems/mruby-compiler/core/parse.y"
+#line 3304 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[0].nd);
                     }
-#line 8993 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8990 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 435:
-#line 3321 "mrbgems/mruby-compiler/core/parse.y"
+#line 3318 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = concat_string(p, (yyvsp[-1].nd), (yyvsp[0].nd));
                     }
-#line 9001 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 8998 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 438:
-#line 3329 "mrbgems/mruby-compiler/core/parse.y"
+#line 3326 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[0].nd);
                     }
-#line 9009 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9006 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 439:
-#line 3333 "mrbgems/mruby-compiler/core/parse.y"
+#line 3330 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       node *n = (yyvsp[-1].nd);
                       if (intn((yyvsp[0].nd)->cdr->cdr) > 0) {
@@ -9020,69 +9017,69 @@ yyreduce:
                       }
                       (yyval.nd) = new_dstr(p, n);
                     }
-#line 9024 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9021 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 441:
-#line 3347 "mrbgems/mruby-compiler/core/parse.y"
+#line 3344 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = append((yyvsp[-1].nd), (yyvsp[0].nd));
                     }
-#line 9032 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9029 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 442:
-#line 3353 "mrbgems/mruby-compiler/core/parse.y"
+#line 3350 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1((yyvsp[0].nd));
                     }
-#line 9040 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9037 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 443:
-#line 3357 "mrbgems/mruby-compiler/core/parse.y"
+#line 3354 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = p->lex_strterm;
                       p->lex_strterm = NULL;
                     }
-#line 9049 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9046 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 444:
-#line 3363 "mrbgems/mruby-compiler/core/parse.y"
+#line 3360 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       p->lex_strterm = (yyvsp[-2].nd);
                       (yyval.nd) = list2((yyvsp[-3].nd), (yyvsp[-1].nd));
                     }
-#line 9058 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9055 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 445:
-#line 3368 "mrbgems/mruby-compiler/core/parse.y"
+#line 3365 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1(new_literal_delim(p));
                     }
-#line 9066 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9063 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 446:
-#line 3372 "mrbgems/mruby-compiler/core/parse.y"
+#line 3369 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1(new_literal_delim(p));
                     }
-#line 9074 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9071 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 447:
-#line 3378 "mrbgems/mruby-compiler/core/parse.y"
+#line 3375 "mrbgems/mruby-compiler/core/parse.y"
                     {
                         (yyval.nd) = (yyvsp[0].nd);
                     }
-#line 9082 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9079 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 448:
-#line 3382 "mrbgems/mruby-compiler/core/parse.y"
+#line 3379 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       node *n = (yyvsp[-1].nd);
                       if (intn((yyvsp[0].nd)->cdr->cdr) > 0) {
@@ -9093,82 +9090,82 @@ yyreduce:
                       }
                       (yyval.nd) = new_dxstr(p, n);
                     }
-#line 9097 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9094 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 449:
-#line 3395 "mrbgems/mruby-compiler/core/parse.y"
+#line 3392 "mrbgems/mruby-compiler/core/parse.y"
                     {
                         (yyval.nd) = (yyvsp[0].nd);
                     }
-#line 9105 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9102 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 450:
-#line 3399 "mrbgems/mruby-compiler/core/parse.y"
+#line 3396 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_dregx(p, (yyvsp[-1].nd), (yyvsp[0].nd));
                     }
-#line 9113 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9110 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 454:
-#line 3412 "mrbgems/mruby-compiler/core/parse.y"
+#line 3409 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       parser_heredoc_info * inf = parsing_heredoc_inf(p);
                       inf->doc = push(inf->doc, new_str(p, "", 0));
                       heredoc_end(p);
                     }
-#line 9123 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9120 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 455:
-#line 3418 "mrbgems/mruby-compiler/core/parse.y"
+#line 3415 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       heredoc_end(p);
                     }
-#line 9131 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9128 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 458:
-#line 3428 "mrbgems/mruby-compiler/core/parse.y"
+#line 3425 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       parser_heredoc_info * inf = parsing_heredoc_inf(p);
                       inf->doc = push(inf->doc, (yyvsp[0].nd));
                       heredoc_treat_nextline(p);
                     }
-#line 9141 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9138 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 459:
-#line 3434 "mrbgems/mruby-compiler/core/parse.y"
+#line 3431 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = p->lex_strterm;
                       p->lex_strterm = NULL;
                     }
-#line 9150 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9147 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 460:
-#line 3440 "mrbgems/mruby-compiler/core/parse.y"
+#line 3437 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       parser_heredoc_info * inf = parsing_heredoc_inf(p);
                       p->lex_strterm = (yyvsp[-2].nd);
                       inf->doc = push(push(inf->doc, (yyvsp[-3].nd)), (yyvsp[-1].nd));
                     }
-#line 9160 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9157 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 461:
-#line 3448 "mrbgems/mruby-compiler/core/parse.y"
+#line 3445 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_words(p, list1((yyvsp[0].nd)));
                     }
-#line 9168 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9165 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 462:
-#line 3452 "mrbgems/mruby-compiler/core/parse.y"
+#line 3449 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       node *n = (yyvsp[-1].nd);
                       if (intn((yyvsp[0].nd)->cdr->cdr) > 0) {
@@ -9179,20 +9176,20 @@ yyreduce:
                       }
                       (yyval.nd) = new_words(p, n);
                     }
-#line 9183 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9180 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 463:
-#line 3466 "mrbgems/mruby-compiler/core/parse.y"
+#line 3463 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       p->lstate = EXPR_ENDARG;
                       (yyval.nd) = new_sym(p, (yyvsp[0].id));
                     }
-#line 9192 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9189 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 464:
-#line 3471 "mrbgems/mruby-compiler/core/parse.y"
+#line 3468 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       node *n = (yyvsp[-1].nd);
                       p->lstate = EXPR_ENDARG;
@@ -9204,43 +9201,43 @@ yyreduce:
                       }
                       (yyval.nd) = new_dsym(p, new_dstr(p, n));
                     }
-#line 9208 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9205 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 465:
-#line 3485 "mrbgems/mruby-compiler/core/parse.y"
+#line 3482 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.id) = (yyvsp[0].id);
                     }
-#line 9216 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9213 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 470:
-#line 3495 "mrbgems/mruby-compiler/core/parse.y"
+#line 3492 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.id) = new_strsym(p, (yyvsp[0].nd));
                     }
-#line 9224 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9221 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 471:
-#line 3499 "mrbgems/mruby-compiler/core/parse.y"
+#line 3496 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.id) = new_strsym(p, (yyvsp[0].nd));
                     }
-#line 9232 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9229 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 472:
-#line 3505 "mrbgems/mruby-compiler/core/parse.y"
+#line 3502 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_symbols(p, list1((yyvsp[0].nd)));
                     }
-#line 9240 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9237 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 473:
-#line 3509 "mrbgems/mruby-compiler/core/parse.y"
+#line 3506 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       node *n = (yyvsp[-1].nd);
                       if (intn((yyvsp[0].nd)->cdr->cdr) > 0) {
@@ -9248,123 +9245,123 @@ yyreduce:
                       }
                       (yyval.nd) = new_symbols(p, n);
                     }
-#line 9252 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9249 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 476:
-#line 3521 "mrbgems/mruby-compiler/core/parse.y"
+#line 3518 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_negate(p, (yyvsp[0].nd));
                     }
-#line 9260 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9257 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 477:
-#line 3525 "mrbgems/mruby-compiler/core/parse.y"
+#line 3522 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_negate(p, (yyvsp[0].nd));
                     }
-#line 9268 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9265 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 478:
-#line 3531 "mrbgems/mruby-compiler/core/parse.y"
+#line 3528 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_lvar(p, (yyvsp[0].id));
                     }
-#line 9276 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9273 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 479:
-#line 3535 "mrbgems/mruby-compiler/core/parse.y"
+#line 3532 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_ivar(p, (yyvsp[0].id));
                     }
-#line 9284 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9281 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 480:
-#line 3539 "mrbgems/mruby-compiler/core/parse.y"
+#line 3536 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_gvar(p, (yyvsp[0].id));
                     }
-#line 9292 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9289 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 481:
-#line 3543 "mrbgems/mruby-compiler/core/parse.y"
+#line 3540 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_cvar(p, (yyvsp[0].id));
                     }
-#line 9300 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9297 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 482:
-#line 3547 "mrbgems/mruby-compiler/core/parse.y"
+#line 3544 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_const(p, (yyvsp[0].id));
                     }
-#line 9308 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9305 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 483:
-#line 3553 "mrbgems/mruby-compiler/core/parse.y"
+#line 3550 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       assignable(p, (yyvsp[0].nd));
                     }
-#line 9316 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9313 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 484:
-#line 3557 "mrbgems/mruby-compiler/core/parse.y"
+#line 3554 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       yyerror(p, "can't assign to numbered parameter");
                     }
-#line 9324 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9321 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 485:
-#line 3563 "mrbgems/mruby-compiler/core/parse.y"
+#line 3560 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = var_reference(p, (yyvsp[0].nd));
                     }
-#line 9332 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9329 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 486:
-#line 3567 "mrbgems/mruby-compiler/core/parse.y"
+#line 3564 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_nil(p);
                     }
-#line 9340 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9337 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 487:
-#line 3571 "mrbgems/mruby-compiler/core/parse.y"
+#line 3568 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_self(p);
                     }
-#line 9348 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9345 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 488:
-#line 3575 "mrbgems/mruby-compiler/core/parse.y"
+#line 3572 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_true(p);
                     }
-#line 9356 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9353 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 489:
-#line 3579 "mrbgems/mruby-compiler/core/parse.y"
+#line 3576 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_false(p);
                     }
-#line 9364 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9361 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 490:
-#line 3583 "mrbgems/mruby-compiler/core/parse.y"
+#line 3580 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       const char *fn = mrb_sym_name_len(p->mrb, p->filename_sym, NULL);
                       if (!fn) {
@@ -9372,598 +9369,598 @@ yyreduce:
                       }
                       (yyval.nd) = new_str(p, fn, strlen(fn));
                     }
-#line 9376 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9373 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 491:
-#line 3591 "mrbgems/mruby-compiler/core/parse.y"
+#line 3588 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       char buf[16];
 
                       dump_int(p->lineno, buf);
                       (yyval.nd) = new_int(p, buf, 10, 0);
                     }
-#line 9387 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9384 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 492:
-#line 3598 "mrbgems/mruby-compiler/core/parse.y"
+#line 3595 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_fcall(p, MRB_SYM_2(p->mrb, __ENCODING__), 0);
                     }
-#line 9395 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9392 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 495:
-#line 3608 "mrbgems/mruby-compiler/core/parse.y"
+#line 3605 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = 0;
                     }
-#line 9403 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9400 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 496:
-#line 3612 "mrbgems/mruby-compiler/core/parse.y"
+#line 3609 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       p->lstate = EXPR_BEG;
                       p->cmd_start = TRUE;
                     }
-#line 9412 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9409 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 497:
-#line 3617 "mrbgems/mruby-compiler/core/parse.y"
+#line 3614 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-1].nd);
                     }
-#line 9420 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9417 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 500:
-#line 3633 "mrbgems/mruby-compiler/core/parse.y"
+#line 3630 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-1].nd);
                       p->lstate = EXPR_BEG;
                       p->cmd_start = TRUE;
                     }
-#line 9430 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9427 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 501:
-#line 3639 "mrbgems/mruby-compiler/core/parse.y"
+#line 3636 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args_dots(p, (yyvsp[-3].nd));
                     }
-#line 9438 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9435 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 502:
-#line 3643 "mrbgems/mruby-compiler/core/parse.y"
+#line 3640 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args_dots(p, 0);
                     }
-#line 9446 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9443 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 504:
-#line 3650 "mrbgems/mruby-compiler/core/parse.y"
+#line 3647 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-1].nd);
                     }
-#line 9454 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9451 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 505:
-#line 3654 "mrbgems/mruby-compiler/core/parse.y"
+#line 3651 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args_dots(p, (yyvsp[-3].nd));
                     }
-#line 9462 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9459 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 506:
-#line 3658 "mrbgems/mruby-compiler/core/parse.y"
+#line 3655 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args_dots(p, 0);
                     }
-#line 9470 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9467 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 507:
-#line 3664 "mrbgems/mruby-compiler/core/parse.y"
+#line 3661 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       local_nest(p);
                     }
-#line 9478 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9475 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 508:
-#line 3670 "mrbgems/mruby-compiler/core/parse.y"
+#line 3667 "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 9488 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9485 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 509:
-#line 3676 "mrbgems/mruby-compiler/core/parse.y"
+#line 3673 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_kw_arg(p, (yyvsp[0].id), 0);
                       local_unnest(p);
                     }
-#line 9497 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9494 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 510:
-#line 3683 "mrbgems/mruby-compiler/core/parse.y"
+#line 3680 "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 9507 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9504 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 511:
-#line 3689 "mrbgems/mruby-compiler/core/parse.y"
+#line 3686 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_kw_arg(p, (yyvsp[0].id), 0);
                       local_unnest(p);
                     }
-#line 9516 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9513 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 512:
-#line 3696 "mrbgems/mruby-compiler/core/parse.y"
+#line 3693 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1((yyvsp[0].nd));
                     }
-#line 9524 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9521 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 513:
-#line 3700 "mrbgems/mruby-compiler/core/parse.y"
+#line 3697 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push((yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 9532 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9529 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 514:
-#line 3706 "mrbgems/mruby-compiler/core/parse.y"
+#line 3703 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1((yyvsp[0].nd));
                     }
-#line 9540 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9537 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 515:
-#line 3710 "mrbgems/mruby-compiler/core/parse.y"
+#line 3707 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push((yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 9548 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9545 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 518:
-#line 3720 "mrbgems/mruby-compiler/core/parse.y"
+#line 3717 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_kw_rest_args(p, nsym((yyvsp[0].id)));
                     }
-#line 9556 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9553 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 519:
-#line 3724 "mrbgems/mruby-compiler/core/parse.y"
+#line 3721 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_kw_rest_args(p, 0);
                     }
-#line 9564 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9561 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 520:
-#line 3730 "mrbgems/mruby-compiler/core/parse.y"
+#line 3727 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args_tail(p, (yyvsp[-3].nd), (yyvsp[-1].nd), (yyvsp[0].id));
                     }
-#line 9572 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9569 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 521:
-#line 3734 "mrbgems/mruby-compiler/core/parse.y"
+#line 3731 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args_tail(p, (yyvsp[-1].nd), 0, (yyvsp[0].id));
                     }
-#line 9580 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9577 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 522:
-#line 3738 "mrbgems/mruby-compiler/core/parse.y"
+#line 3735 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args_tail(p, 0, (yyvsp[-1].nd), (yyvsp[0].id));
                     }
-#line 9588 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9585 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 523:
-#line 3742 "mrbgems/mruby-compiler/core/parse.y"
+#line 3739 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args_tail(p, 0, 0, (yyvsp[0].id));
                     }
-#line 9596 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9593 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 524:
-#line 3748 "mrbgems/mruby-compiler/core/parse.y"
+#line 3745 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[0].nd);
                     }
-#line 9604 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9601 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 525:
-#line 3752 "mrbgems/mruby-compiler/core/parse.y"
+#line 3749 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args_tail(p, 0, 0, 0);
                     }
-#line 9612 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9609 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 526:
-#line 3758 "mrbgems/mruby-compiler/core/parse.y"
+#line 3755 "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 9620 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9617 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 527:
-#line 3762 "mrbgems/mruby-compiler/core/parse.y"
+#line 3759 "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 9628 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9625 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 528:
-#line 3766 "mrbgems/mruby-compiler/core/parse.y"
+#line 3763 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, (yyvsp[-3].nd), (yyvsp[-1].nd), 0, 0, (yyvsp[0].nd));
                     }
-#line 9636 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9633 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 529:
-#line 3770 "mrbgems/mruby-compiler/core/parse.y"
+#line 3767 "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 9644 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9641 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 530:
-#line 3774 "mrbgems/mruby-compiler/core/parse.y"
+#line 3771 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, (yyvsp[-3].nd), 0, (yyvsp[-1].id), 0, (yyvsp[0].nd));
                     }
-#line 9652 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9649 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 531:
-#line 3778 "mrbgems/mruby-compiler/core/parse.y"
+#line 3775 "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 9660 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9657 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 532:
-#line 3782 "mrbgems/mruby-compiler/core/parse.y"
+#line 3779 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, (yyvsp[-1].nd), 0, 0, 0, (yyvsp[0].nd));
                     }
-#line 9668 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9665 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 533:
-#line 3786 "mrbgems/mruby-compiler/core/parse.y"
+#line 3783 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, 0, (yyvsp[-3].nd), (yyvsp[-1].id), 0, (yyvsp[0].nd));
                     }
-#line 9676 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9673 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 534:
-#line 3790 "mrbgems/mruby-compiler/core/parse.y"
+#line 3787 "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 9684 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9681 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 535:
-#line 3794 "mrbgems/mruby-compiler/core/parse.y"
+#line 3791 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, 0, (yyvsp[-1].nd), 0, 0, (yyvsp[0].nd));
                     }
-#line 9692 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9689 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 536:
-#line 3798 "mrbgems/mruby-compiler/core/parse.y"
+#line 3795 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, 0, (yyvsp[-3].nd), 0, (yyvsp[-1].nd), (yyvsp[0].nd));
                     }
-#line 9700 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9697 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 537:
-#line 3802 "mrbgems/mruby-compiler/core/parse.y"
+#line 3799 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, 0, 0, (yyvsp[-1].id), 0, (yyvsp[0].nd));
                     }
-#line 9708 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9705 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 538:
-#line 3806 "mrbgems/mruby-compiler/core/parse.y"
+#line 3803 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, 0, 0, (yyvsp[-3].id), (yyvsp[-1].nd), (yyvsp[0].nd));
                     }
-#line 9716 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9713 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 539:
-#line 3810 "mrbgems/mruby-compiler/core/parse.y"
+#line 3807 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_args(p, 0, 0, 0, 0, (yyvsp[0].nd));
                     }
-#line 9724 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9721 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 540:
-#line 3814 "mrbgems/mruby-compiler/core/parse.y"
+#line 3811 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       local_add_f(p, intern_op(and));
                       (yyval.nd) = new_args(p, 0, 0, 0, 0, 0);
                     }
-#line 9733 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9730 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 541:
-#line 3821 "mrbgems/mruby-compiler/core/parse.y"
+#line 3818 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       yyerror(p, "formal argument cannot be a constant");
                       (yyval.nd) = 0;
                     }
-#line 9742 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9739 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 542:
-#line 3826 "mrbgems/mruby-compiler/core/parse.y"
+#line 3823 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       yyerror(p, "formal argument cannot be an instance variable");
                       (yyval.nd) = 0;
                     }
-#line 9751 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9748 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 543:
-#line 3831 "mrbgems/mruby-compiler/core/parse.y"
+#line 3828 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       yyerror(p, "formal argument cannot be a global variable");
                       (yyval.nd) = 0;
                     }
-#line 9760 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9757 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 544:
-#line 3836 "mrbgems/mruby-compiler/core/parse.y"
+#line 3833 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       yyerror(p, "formal argument cannot be a class variable");
                       (yyval.nd) = 0;
                     }
-#line 9769 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9766 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 545:
-#line 3841 "mrbgems/mruby-compiler/core/parse.y"
+#line 3838 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       yyerror(p, "formal argument cannot be a numbered parameter");
                       (yyval.nd) = 0;
                     }
-#line 9778 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9775 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 546:
-#line 3848 "mrbgems/mruby-compiler/core/parse.y"
+#line 3845 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.id) = 0;
                     }
-#line 9786 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9783 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 547:
-#line 3852 "mrbgems/mruby-compiler/core/parse.y"
+#line 3849 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       local_add_f(p, (yyvsp[0].id));
                       (yyval.id) = (yyvsp[0].id);
                     }
-#line 9795 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9792 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 548:
-#line 3859 "mrbgems/mruby-compiler/core/parse.y"
+#line 3856 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_arg(p, (yyvsp[0].id));
                     }
-#line 9803 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9800 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 549:
-#line 3863 "mrbgems/mruby-compiler/core/parse.y"
+#line 3860 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = local_switch(p);
                     }
-#line 9811 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9808 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 550:
-#line 3867 "mrbgems/mruby-compiler/core/parse.y"
+#line 3864 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = new_masgn_param(p, (yyvsp[-1].nd), p->locals->car);
                       local_resume(p, (yyvsp[-2].nd));
                     }
-#line 9820 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9817 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 551:
-#line 3874 "mrbgems/mruby-compiler/core/parse.y"
+#line 3871 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1((yyvsp[0].nd));
                     }
-#line 9828 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9825 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 552:
-#line 3878 "mrbgems/mruby-compiler/core/parse.y"
+#line 3875 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push((yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 9836 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9833 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 553:
-#line 3884 "mrbgems/mruby-compiler/core/parse.y"
+#line 3881 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       local_add_f(p, (yyvsp[-1].id));
                       local_nest(p);
                       (yyval.id) = (yyvsp[-1].id);
                     }
-#line 9846 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9843 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 554:
-#line 3892 "mrbgems/mruby-compiler/core/parse.y"
+#line 3889 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       void_expr_error(p, (yyvsp[0].nd));
                       (yyval.nd) = cons(nsym((yyvsp[-1].id)), cons((yyvsp[0].nd), locals_node(p)));
                       local_unnest(p);
                     }
-#line 9856 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9853 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 555:
-#line 3900 "mrbgems/mruby-compiler/core/parse.y"
+#line 3897 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       void_expr_error(p, (yyvsp[0].nd));
                       (yyval.nd) = cons(nsym((yyvsp[-1].id)), cons((yyvsp[0].nd), locals_node(p)));
                       local_unnest(p);
                     }
-#line 9866 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9863 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 556:
-#line 3908 "mrbgems/mruby-compiler/core/parse.y"
+#line 3905 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1((yyvsp[0].nd));
                     }
-#line 9874 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9871 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 557:
-#line 3912 "mrbgems/mruby-compiler/core/parse.y"
+#line 3909 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push((yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 9882 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9879 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 558:
-#line 3918 "mrbgems/mruby-compiler/core/parse.y"
+#line 3915 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1((yyvsp[0].nd));
                     }
-#line 9890 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9887 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 559:
-#line 3922 "mrbgems/mruby-compiler/core/parse.y"
+#line 3919 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push((yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 9898 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9895 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 562:
-#line 3932 "mrbgems/mruby-compiler/core/parse.y"
+#line 3929 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       local_add_f(p, (yyvsp[0].id));
                       (yyval.id) = (yyvsp[0].id);
                     }
-#line 9907 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9904 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 563:
-#line 3937 "mrbgems/mruby-compiler/core/parse.y"
+#line 3934 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.id) = intern_op(mul);
                       local_add_f(p, (yyval.id));
                     }
-#line 9916 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9913 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 566:
-#line 3948 "mrbgems/mruby-compiler/core/parse.y"
+#line 3945 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.id) = (yyvsp[0].id);
                     }
-#line 9924 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9921 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 567:
-#line 3952 "mrbgems/mruby-compiler/core/parse.y"
+#line 3949 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.id) = intern_op(and);
                     }
-#line 9932 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9929 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 568:
-#line 3958 "mrbgems/mruby-compiler/core/parse.y"
+#line 3955 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.id) = (yyvsp[0].id);
                     }
-#line 9940 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9937 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 569:
-#line 3962 "mrbgems/mruby-compiler/core/parse.y"
+#line 3959 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.id) = 0;
                     }
-#line 9948 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9945 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 570:
-#line 3968 "mrbgems/mruby-compiler/core/parse.y"
+#line 3965 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[0].nd);
                       if (!(yyval.nd)) (yyval.nd) = new_nil(p);
                     }
-#line 9957 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9954 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 571:
-#line 3972 "mrbgems/mruby-compiler/core/parse.y"
+#line 3969 "mrbgems/mruby-compiler/core/parse.y"
                       {p->lstate = EXPR_BEG;}
-#line 9963 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9960 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 572:
-#line 3973 "mrbgems/mruby-compiler/core/parse.y"
+#line 3970 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       if ((yyvsp[-1].nd) == 0) {
                         yyerror(p, "can't define singleton method for ().");
@@ -9986,63 +9983,63 @@ yyreduce:
                       }
                       (yyval.nd) = (yyvsp[-1].nd);
                     }
-#line 9990 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9987 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 574:
-#line 3999 "mrbgems/mruby-compiler/core/parse.y"
+#line 3996 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = (yyvsp[-1].nd);
                     }
-#line 9998 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 9995 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 575:
-#line 4005 "mrbgems/mruby-compiler/core/parse.y"
+#line 4002 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = list1((yyvsp[0].nd));
                       NODE_LINENO((yyval.nd), (yyvsp[0].nd));
                     }
-#line 10007 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10004 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 576:
-#line 4010 "mrbgems/mruby-compiler/core/parse.y"
+#line 4007 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = push((yyvsp[-2].nd), (yyvsp[0].nd));
                     }
-#line 10015 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10012 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 577:
-#line 4016 "mrbgems/mruby-compiler/core/parse.y"
+#line 4013 "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 10025 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10022 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 578:
-#line 4022 "mrbgems/mruby-compiler/core/parse.y"
+#line 4019 "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 10034 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10031 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 579:
-#line 4027 "mrbgems/mruby-compiler/core/parse.y"
+#line 4024 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = cons(new_sym(p, (yyvsp[-1].id)), label_reference(p, (yyvsp[-1].id)));
                     }
-#line 10042 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10039 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 580:
-#line 4031 "mrbgems/mruby-compiler/core/parse.y"
+#line 4028 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       void_expr_error(p, (yyvsp[0].nd));
                       if (typen((yyvsp[-2].nd)->car) == NODE_DSTR) {
@@ -10052,67 +10049,67 @@ yyreduce:
                         (yyval.nd) = cons(new_sym(p, new_strsym(p, (yyvsp[-2].nd))), (yyvsp[0].nd));
                       }
                     }
-#line 10056 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10053 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 581:
-#line 4041 "mrbgems/mruby-compiler/core/parse.y"
+#line 4038 "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 10065 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10062 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 594:
-#line 4068 "mrbgems/mruby-compiler/core/parse.y"
+#line 4065 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.num) = '.';
                     }
-#line 10073 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10070 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 595:
-#line 4072 "mrbgems/mruby-compiler/core/parse.y"
+#line 4069 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.num) = 0;
                     }
-#line 10081 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10078 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 597:
-#line 4079 "mrbgems/mruby-compiler/core/parse.y"
+#line 4076 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.num) = tCOLON2;
                     }
-#line 10089 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10086 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 606:
-#line 4100 "mrbgems/mruby-compiler/core/parse.y"
+#line 4097 "mrbgems/mruby-compiler/core/parse.y"
                       {yyerrok;}
-#line 10095 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10092 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 608:
-#line 4105 "mrbgems/mruby-compiler/core/parse.y"
+#line 4102 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       p->lineno += (yyvsp[0].num);
                       p->column = 0;
                     }
-#line 10104 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10101 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
   case 612:
-#line 4117 "mrbgems/mruby-compiler/core/parse.y"
+#line 4114 "mrbgems/mruby-compiler/core/parse.y"
                     {
                       (yyval.nd) = 0;
                     }
-#line 10112 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10109 "mrbgems/mruby-compiler/core/y.tab.c"
     break;
 
 
-#line 10116 "mrbgems/mruby-compiler/core/y.tab.c"
+#line 10113 "mrbgems/mruby-compiler/core/y.tab.c"
 
       default: break;
     }
@@ -10344,7 +10341,7 @@ yyreturn:
 #endif
   return yyresult;
 }
-#line 4121 "mrbgems/mruby-compiler/core/parse.y"
+#line 4118 "mrbgems/mruby-compiler/core/parse.y"
 
 #define pylval  (*((YYSTYPE*)(p->ylval)))
 
@@ -12655,6 +12652,10 @@ parser_yylex(parser_state *p)
           if (nvar == -1) {
             yywarning(p, "numbered parameter used in inner block");
           }
+          else {
+            int nvars = intn(p->nvars->car);
+            p->nvars->car = nint(nvars > n ? nvars : n);
+          }
           pylval.num = n;
           p->lstate = EXPR_END;
           return tNUMPARAM;
diff --git a/src/cdump.c b/src/cdump.c
index ecc27d9a1..b4dfc4e87 100644
--- a/src/cdump.c
+++ b/src/cdump.c
@@ -1,5 +1,5 @@
 /*
-** dump.c - mruby binary dumper (mrbc binary format)
+** cdump.c - mruby binary dumper (in C)
 **
 ** See Copyright Notice in mruby.h
 */
diff --git a/src/dump.c b/src/dump.c
index 2b7379d8e..3841e12ac 100644
--- a/src/dump.c
+++ b/src/dump.c
@@ -1,5 +1,5 @@
 /*
-** cdump.c - mruby binary dumper (in C)
+** dump.c - mruby binary dumper (mrbc binary format)
 **
 ** See Copyright Notice in mruby.h
 */