From 0a61df1c34c62da59bf1443d6913e99158a938a4 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby-lang.org>
Date: Wed, 9 Aug 2017 12:57:55 +0900
Subject: The block argument offset saved in the env was wrong; fix #3768

When the method takes variable number of argument (`argc = -1`),
the block argument offset should be `-1` not `0`.
---
 src/vm.c | 1 +
 1 file changed, 1 insertion(+)

(limited to 'src/vm.c')

diff --git a/src/vm.c b/src/vm.c
index 3eced7e89..970753a7c 100644
--- a/src/vm.c
+++ b/src/vm.c
@@ -289,6 +289,7 @@ mrb_env_unshare(mrb_state *mrb, struct REnv *e)
     if (!e->c) {
       /* save block argument position (negated) */
       e->cioff = -e->cxt.c->cibase[cioff].argc-1;
+      if (e->cioff == 0) e->cioff = -1;
     }
     e->cxt.mid = e->cxt.c->cibase[cioff].mid;
     p = (mrb_value *)mrb_malloc(mrb, sizeof(mrb_value)*len);
-- 
cgit v1.2.3