[MacRuby] #1111: MacRuby throws an exception when undefine the String#length.

[MacRuby]

#1111: MacRuby throws an exception when undefine the String#length.
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 Reporter:  watson1978@…          |       Owner:  lsansonetti@…        
     Type:  defect                |      Status:  new                  
 Priority:  major                 |   Milestone:                       
Component:  MacRuby               |    Keywords:                       
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 Test:
 {{{
 $ ruby -v -e 'String.class_eval{ undef :length }'
 ruby 1.8.7 (2009-06-12 patchlevel 174) [universal-darwin10.0]

 $ ruby19 -v -e 'String.class_eval{ undef :length }'
 ruby 1.9.2p136 (2010-12-25 revision 30365) [x86_64-darwin10.5.0]

 $  macruby -v -e 'String.class_eval{ undef :length }'
 MacRuby 0.9 (ruby 1.9.2) [universal-darwin10.0, x86_64]
 -e:1:in `<main>': cannot undefine method `length' because it is a native
 method (RuntimeError)
 }}}

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Ticket URL: <http://www.macruby.org/trac/ticket/1111>
MacRuby <http://macruby.org/>