nobu	2018-12-07 08:03:54 +0900 (Fri, 07 Dec 2018)

  New Revision: 66261

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=66261

  Log:
    Show the class of the receiver [Feature #15231]

  Modified files:
    trunk/object.c
Index: object.c
===================================================================
--- object.c	(revision 66260)
+++ object.c	(revision 66261)
@@ -1686,7 +1686,8 @@ rb_false(VALUE obj) https://github.com/ruby/ruby/blob/trunk/object.c#L1686
 static VALUE
 rb_obj_match(VALUE obj1, VALUE obj2)
 {
-    rb_warning("Object#=~ is deprecated; it always returns nil");
+    rb_warning("deprecated Object#=~ is called on %"PRIsVALUE
+               "; it always returns nil", rb_obj_class(obj1));
     return Qnil;
 }
 

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