[ruby-talk:02514] frozen behavior

Hi everyone,

I've got a quick question regarding the behavior of "frozen".
Are you supposed to be able to add methods to a frozen object?

  ObjectSpace.each_object() {|x| 
    begin
      def x.something
        "foo"
      end
    rescue
      puts "Trying to modify #{x.type} #{x.inspect}: #{$!}"
    end
  }

Results in:

  Trying to modify String "Struct": can't modify frozen object
  Trying to modify String "File": can't modify frozen object
  Trying to modify String "\n": can't modify frozen object
  Trying to modify String "Errno": can't modify frozen object

Is this correct behavior?  And what is magic about these four
strings that they are frozen?

Thanks...

/\ndy

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Andrew Hunt, The Pragmatic Programmers, LLC.
Innovative Object-Oriented Software Development
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