From ab39ed4f825c1957546217a8c2e510244a967193 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby-lang.org>
Date: Fri, 11 Aug 2017 13:15:50 +0900
Subject: Defer `mid` update after `unshift`; ref #3776

---
 src/vm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/vm.c b/src/vm.c
index f37ce57c8..22d7f997f 100644
--- a/src/vm.c
+++ b/src/vm.c
@@ -1393,7 +1393,6 @@ RETRY_TRY_BLOCK:
           ERR_PC_SET(mrb, pc);
           mrb_method_missing(mrb, mid, recv, args);
         }
-        mid = missing;
         if (n != CALL_MAXARGS) {
           if (a+2 >= irep->nregs) {
             stack_extend(mrb, a+3);
@@ -1403,6 +1402,7 @@ RETRY_TRY_BLOCK:
           n = CALL_MAXARGS;
         }
         mrb_ary_unshift(mrb, regs[a+1], mrb_symbol_value(mid));
+        mid = missing;
       }
 
       /* push callinfo */
-- 
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