From: Konrad Meyer <konrad@...>
Date: 2007-09-09T12:40:41+09:00
Subject: Re: Bug in lambda?

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On Saturday 08 September 2007 08:15:06 pm kevin cline wrote:
> This looks like a pretty serious bug.  It seems that lambda-
> expressions are not properly localizing their formal arguments:
>=20
> bash-3.2$ ruby --version
> ruby 1.8.6 (2007-03-13 patchlevel 0) [i386-mswin32]
>=20
> bash-3.2$ cat lambda-bug.rb
> a =3D 0
> f =3D lambda { |a| a }
> puts "a =3D #{a}"
> puts "f.call(1) =3D> #{f.call(1)}"
> puts "now a =3D #{a}"
>=20
> bash-3.2$ ruby lambda-bug.rb
> a =3D 0
> f.call(1) =3D> 1
> now a =3D 1

IIRC this is a ruby 1.8.x thing; it will be fixed in 1.9. Don't depend on
this behaviour / try to avoid repeating variable names :D.

Cheers,
=2D-=20
Konrad Meyer <konrad@tylerc.org> http://konrad.sobertillnoon.com/

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