From fb78f1089304e09932f022800395a6c0f507dda0 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby.or.jp>
Date: Thu, 22 Mar 2018 01:01:18 +0900
Subject: Need to keep block argument in `mrb_exec_irep`; fix #3973

---
 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 274eee253..e5bbf657c 100644
--- a/src/vm.c
+++ b/src/vm.c
@@ -516,7 +516,7 @@ mrb_exec_irep(mrb_state *mrb, mrb_value self, struct RProc *p)
   }
   ci->nregs = p->body.irep->nregs;
   if (ci->argc < 0) keep = 3;
-  else keep = ci->argc + 1;
+  else keep = ci->argc + 2;
   if (ci->nregs < keep) {
     stack_extend(mrb, keep);
   }
-- 
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