From: Ryan Davis <ryand-ruby@...>
Date: 2005-01-14T12:20:04+09:00
Subject: patch to date.rb

If date.rb is loaded twice, the second load raises NameError.

> <527> cat blah.rb
>
> require './lib/date.rb'
> require '/Volumes/Space/ryan/Work/cvs/ruby-lang/ruby_18/lib/date.rb'

causes:

> <528> ./ruby18 blah.rb
> /Volumes/Space/ryan/Work/cvs/ruby-lang/ruby_18/lib/date.rb:238: 
> warning: already initialized constant MONTHNAMES
> /Volumes/Space/ryan/Work/cvs/ruby-lang/ruby_18/lib/date.rb:243: 
> warning: already initialized constant DAYNAMES
> /Volumes/Space/ryan/Work/cvs/ruby-lang/ruby_18/lib/date.rb:247: 
> warning: already initialized constant ABBR_MONTHNAMES
> /Volumes/Space/ryan/Work/cvs/ruby-lang/ruby_18/lib/date.rb:250: 
> warning: already initialized constant ABBR_DAYNAMES
> /Volumes/Space/ryan/Work/cvs/ruby-lang/ruby_18/lib/date.rb:254: 
> warning: already initialized constant ITALY
> /Volumes/Space/ryan/Work/cvs/ruby-lang/ruby_18/lib/date.rb:258: 
> warning: already initialized constant ENGLAND
> /Volumes/Space/ryan/Work/cvs/ruby-lang/ruby_18/lib/date.rb:262: 
> warning: already initialized constant JULIAN
> /Volumes/Space/ryan/Work/cvs/ruby-lang/ruby_18/lib/date.rb:266: 
> warning: already initialized constant GREGORIAN
> /Volumes/Space/ryan/Work/cvs/ruby-lang/ruby_18/lib/date.rb:1261:in 
> `undef_method': undefined method `today' for `DateTime' (NameError)
>         from 
> /Volumes/Space/ryan/Work/cvs/ruby-lang/ruby_18/lib/date.rb:1261
>         from blah.rb:3:in `require'
>         from blah.rb:3

With the patch below you just get the warnings.

<506> cvs diff -du lib/date.rb
Index: lib/date.rb
===================================================================
RCS file: /src/ruby/lib/date.rb,v
retrieving revision 1.17.2.5
diff -d -u -r1.17.2.5 date.rb
--- lib/date.rb 23 Jul 2004 07:52:37 -0000      1.17.2.5
+++ lib/date.rb 14 Jan 2005 03:09:34 -0000
@@ -1258,7 +1258,7 @@
      new_with_hash(elem, sg)
    end

-  class << self; undef_method :today end
+  class << self; undef_method :today end rescue nil

    # Create a new DateTime object representing the current time.
    #