ryan	2011-01-05 14:18:48 +0900 (Wed, 05 Jan 2011)

  New Revision: 30455

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=rev&revision=30455

  Log:
    Error#to_s should ensure that the value returned is a string.

  Modified files:
    trunk/error.c

Index: error.c
===================================================================
--- error.c	(revision 30454)
+++ error.c	(revision 30455)
@@ -524,8 +524,7 @@
     VALUE mesg = rb_attr_get(exc, rb_intern("mesg"));
 
     if (NIL_P(mesg)) return rb_class_name(CLASS_OF(exc));
-    OBJ_INFECT(mesg, exc);
-    return mesg;
+    return rb_String(mesg);
 }
 
 /*

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