nobu	2017-06-01 17:02:41 +0900 (Thu, 01 Jun 2017)

  New Revision: 58985

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=58985

  Log:
    vm_eval.c: fix rb_check_funcall_default
    
    * vm_eval.c (check_funcall_missing): revert r58984.  should call
      method_missing if respond_to_missing is not redefined.
    
    * vm_eval.c (rb_check_funcall_default): return the default value
      if respond_to_missing and method_missing are not defined.

  Modified files:
    trunk/vm_eval.c
Index: vm_eval.c
===================================================================
--- vm_eval.c	(revision 58984)
+++ vm_eval.c	(revision 58985)
@@ -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) || ret == Qundef) return def;
+    if (!RTEST(ret)) return def;
     args.respond = respond > 0;
     args.respond_to_missing = (ret != Qundef);
     ret = def;
@@ -448,8 +448,10 @@ rb_check_funcall_default(VALUE recv, ID https://github.com/ruby/ruby/blob/trunk/vm_eval.c#L448
 
     me = rb_search_method_entry(recv, mid);
     if (!check_funcall_callable(th, me)) {
-	return check_funcall_missing(th, klass, recv, mid, argc, argv,
-				     respond, def);
+	VALUE ret = check_funcall_missing(th, klass, recv, mid, argc, argv,
+					  respond, def);
+	if (ret == Qundef) ret = def;
+	return ret;
     }
     stack_check(th);
     return vm_call0(th, recv, mid, argc, argv, me);

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