From: matz@... (Yukihiro Matsumoto)
Date: 2001-10-06T12:14:59+09:00
Subject: [ruby-talk:22147] Re: Why does Class undefine module_function?

Hi,

In message "[ruby-talk:22135] Why does Class undefine module_function?"
    on 01/10/06, Jeremy Henty <jeremy@chaos.org.uk> writes:

|/usr/local/src/ruby-1.6.5/eval.c: line 5961
|
|    rb_undef_method(rb_cClass, "module_function");
|
|Out of interest, why?  There's no comment in the source, and I haven't
|found an explanation in the ruby-talk archives or the Pickaxe book.  I
|see no reason why a class should not invoke module_function just as a
|module can.  What am I missing?

Remove that line, recompile, then try the following.

  class String
    module_function :sub
  end
  String.sub(/a/, "b")

It would crash the interpreter.

							matz.