script/plugin discoverで例外

ruby script/plugin discover

ってやってみたら、

d:/path/to/ruby/lib/ruby/gems/1.8/gems/rails-1.1.4/lib/commands/plugin.rb:658:in `each': undefined method `[]' for nil:NilClass (NoMethodError)
        from (eval):3:in `__send__'
        from (eval):3:in `each'
        from /path/to/ruby/lib/ruby/gems/1.8/gems/rails-1.1.4/lib/commands/plugin.rb:658:in `scrape'
        from /path/to/ruby/lib/ruby/gems/1.8/gems/rails-1.1.4/lib/commands/plugin.rb:632:in `parse!'
        from /path/to/ruby/lib/ruby/gems/1.8/gems/rails-1.1.4/lib/commands/plugin.rb:631:in `each'
        from /path/to/ruby/lib/ruby/gems/1.8/gems/rails-1.1.4/lib/commands/plugin.rb:631:in `parse!'
        from /path/to/ruby/lib/ruby/gems/1.8/gems/rails-1.1.4/lib/commands/plugin.rb:447:in `parse!'
        from /path/to/ruby/lib/ruby/gems/1.8/gems/rails-1.1.4/lib/commands/plugin.rb:463:in `parse!'
        from /path/to/ruby/lib/ruby/gems/1.8/gems/rails-1.1.4/lib/commands/plugin.rb:871
        from /path/to/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:18:in `require__'
        from /path/to/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:18:in `require'
        from /path/to/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:147:in `require'
        from script/plugin:3

って出た。ぐぐったらhttp://dev.rubyonrails.org/ticket/2796を見つけたので、パッチを手で当てたら動いた。環境はWindows XP,ruby 1.8.2,rails-1.1.4