From 6bdca5d85e15420082ac2e79f4bae1ff7bc5edbc Mon Sep 17 00:00:00 2001
From: shyouhei <shyouhei@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Mon, 19 Nov 2018 06:48:09 +0000
Subject: array.c: avoid (VALUE)--

This args[1]-- overflows when it is zero.  Should do that only
when we can say it is nonzero.




git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@65798 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 array.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/array.c b/array.c
index 00061019b4..b0cb48dc89 100644
--- a/array.c
+++ b/array.c
@@ -3598,7 +3598,8 @@ static VALUE
 take_i(RB_BLOCK_CALL_FUNC_ARGLIST(val, cbarg))
 {
     VALUE *args = (VALUE *)cbarg;
-    if (args[1]-- == 0) rb_iter_break();
+    if (args[1] == 0) rb_iter_break();
+    else args[1]--;
     if (argc > 1) val = rb_ary_new4(argc, argv);
     rb_ary_push(args[0], val);
     return Qnil;
-- 
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