From: Brian Candler <b.candler@...>
Date: 2010-08-01T20:20:12+09:00
Subject: Re: what is the correct way to extend native methods?

Maurizio De Santis wrote:
> why??

What ruby are you using? With ruby 1.8.7 (2010-01-10 patchlevel 249) 
[x86_64-linux] and your posted code, I get the following output:

["a", "ab"]
"b"
ert.rb:17:in `[]': can't convert Regexp into Integer (TypeError)
  from ert.rb:17

If I change it to

  alias_method :slice_without_regexp, :slice
  alias_method :slice, :slice_with_regexp
  alias_method :[], :slice_with_regexp

then *that* gives a stack too deep error, but on the initial slice call.

I'm afraid I don't know the solution though. I suspect slice is already 
an alias for [], or vice versa.
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