nobu	2017-06-01 16:46:22 +0900 (Thu, 01 Jun 2017)

  New Revision: 58984

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=58984

  Log:
    vm_eval.c: fix for rb_check_funcall_default
    
    * vm_eval.c (check_funcall_missing): basic_obj_respond_to_missing
      returns Qundef if respond_to_missing is not redefined.

  Modified files:
    trunk/vm_eval.c
Index: vm_eval.c
===================================================================
--- vm_eval.c	(revision 58983)
+++ vm_eval.c	(revision 58984)
@@ -404,7 +404,7 @@ check_funcall_missing(rb_thread_t *th, V https://github.com/ruby/ruby/blob/trunk/vm_eval.c#L404
 
     ret = basic_obj_respond_to_missing(th, klass, recv,
 				       ID2SYM(mid), PRIV);
-    if (!RTEST(ret)) return def;
+    if (!RTEST(ret) || ret == Qundef) return def;
     args.respond = respond > 0;
     args.respond_to_missing = (ret != Qundef);
     ret = def;

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