ko1	2018-12-24 00:02:17 +0900 (Mon, 24 Dec 2018)

  New Revision: 66514

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=66514

  Log:
    move checking code.
    
    * gc.c (gc_mark_ptr): this check was introduced by accidentaly
      (this is why message is "...", crazy simple) for debugging.
      However, this check is useful because if there is T_NONE
      object here, we can't know which object points to it.
      For debugging reason, I remain this checking code and
      set reasonable error message.

  Modified files:
    trunk/gc.c
Index: gc.c
===================================================================
--- gc.c	(revision 66513)
+++ gc.c	(revision 66514)
@@ -4570,9 +4570,9 @@ static void https://github.com/ruby/ruby/blob/trunk/gc.c#L4570
 gc_mark_ptr(rb_objspace_t *objspace, VALUE obj)
 {
     if (LIKELY(objspace->mark_func_data == NULL)) {
-        if (RB_TYPE_P(obj, T_NONE)) rb_bug("...");
 	rgengc_check_relation(objspace, obj);
 	if (!gc_mark_set(objspace, obj)) return; /* already marked */
+        if (RB_TYPE_P(obj, T_NONE)) rb_bug("try to mark T_NONE object"); /* check here will help debugging */
 	gc_aging(objspace, obj);
 	gc_grey(objspace, obj);
     }

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