shyouhei	2018-11-19 15:48:09 +0900 (Mon, 19 Nov 2018)

  New Revision: 65798

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=65798

  Log:
    array.c: avoid (VALUE)--
    
    This args[1]-- overflows when it is zero.  Should do that only
    when we can say it is nonzero.

  Modified files:
    trunk/array.c
Index: array.c
===================================================================
--- array.c	(revision 65797)
+++ array.c	(revision 65798)
@@ -3598,7 +3598,8 @@ static VALUE https://github.com/ruby/ruby/blob/trunk/array.c#L3598
 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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