From 614927447a233abe7ae2bf8ce0150b7a7d214137 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby-lang.org>
Date: Tue, 27 Oct 2015 01:06:15 +0900
Subject: mrb_str_concat() may call VM resursively thus may reallocate VM
 stack; close #3000

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

diff --git a/src/vm.c b/src/vm.c
index 50d784fcd..e77dd1eb2 100644
--- a/src/vm.c
+++ b/src/vm.c
@@ -2178,6 +2178,7 @@ RETRY_TRY_BLOCK:
     CASE(OP_STRCAT) {
       /* A B    R(A).concat(R(B)) */
       mrb_str_concat(mrb, regs[GETARG_A(i)], regs[GETARG_B(i)]);
+      regs = mrb->c->stack;
       NEXT;
     }
 
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