mame	2017-12-01 09:41:17 +0900 (Fri, 01 Dec 2017)

  New Revision: 60948

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=60948

  Log:
    lib/pp.rb (Kernel#pp): Fix a race condition

  Modified files:
    trunk/lib/pp.rb
Index: lib/pp.rb
===================================================================
--- lib/pp.rb	(revision 60947)
+++ lib/pp.rb	(revision 60948)
@@ -17,13 +17,14 @@ module Kernel https://github.com/ruby/ruby/blob/trunk/lib/pp.rb#L17
   # prints arguments in pretty form.
   #
   # pp returns argument(s).
-  undef pp if method_defined?(:pp)
+  alias __pp_backup__ pp if method_defined?(:pp)
   def pp(*objs)
     objs.each {|obj|
       PP.pp(obj)
     }
     objs.size <= 1 ? objs.first : objs
   end
+  undef __pp_backup__ if method_defined?(:__pp_backup__)
   module_function :pp
 end
 

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