nobu	2015-02-06 11:33:41 +0900 (Fri, 06 Feb 2015)

  New Revision: 49519

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=49519

  Log:
    variable.c: ignore mortal classid
    
    * variable.c (classname): ignore classid if it is a mortal symbol.

  Modified files:
    trunk/variable.c
Index: variable.c
===================================================================
--- variable.c	(revision 49518)
+++ variable.c	(revision 49519)
@@ -163,8 +163,9 @@ classname(VALUE klass, int *permanent) https://github.com/ruby/ruby/blob/trunk/variable.c#L163
 	if (!st_lookup(RCLASS_IV_TBL(klass), (st_data_t)classpath, &n)) {
 	    ID cid = 0;
 	    if (st_lookup(RCLASS_IV_TBL(klass), (st_data_t)classid, &n)) {
-		cid = SYM2ID(n);
-		path = find_class_path(klass, cid);
+		VALUE cname = (VALUE)n;
+		cid = rb_check_id(&cname);
+		if (cid) path = find_class_path(klass, cid);
 	    }
 	    if (NIL_P(path)) {
 		path = find_class_path(klass, (ID)0);

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