From: Thomas Hafner <thomas@...>
Date: 2009-01-31T17:25:07+09:00
Subject: Re: replacing callcc by catch/throw

Tanaka Akira <akr@fsij.org> wrote/schrieb <87d4e56tai.fsf@fsij.org>:

> The argument of catch is optional in Ruby 1.9.
> [...]
> catch generates a unique tag if not given.

Fine! I like that much more than it is in Ruby 1.8. Imagine a Ruby
program uses code from different libraries from different people. In
Ruby 1.8 there's the danger that the catch/throw pairs do interfer in
a bad way as in my example, and because the tags are not part of the
interface, nobody sees the danger. For that reason the new way of
catch/throw should preferred to the old way whenever possible.

Regards
  Thomas