From: matz@... (Yukihiro Matsumoto)
Date: 2004-04-04T23:05:05+09:00
Subject: Re: Any chance to see Exception#resume in Ruby2 ?

Hi,

In message "Any chance to see Exception#resume in Ruby2 ?"
    on 04/04/04, gabriele renzi <surrender_it@rc1.vip.ukl.yahoo.com> writes:

|In the file there is an interesting reference to resumable exceptions.
|
|Now, I googled for them and found this:
|http://www.rubygarden.org/article.php?sid=340
|
|A rejected rcr about it. so I wonder what the final word is about
|this.

I doubt it would be in 2.0, by following reason:

  * performance: resumable exceptions require "raise" to keep its
    continuation inside of exception, that might slow down the
    performance.

  * break assumption: although resumable exception is interesting
    idea, I guess so many code assume "raise" not to resume.

  * can be done explicitly: we can resume to the throw point of the
    exception by using "retry" or "callcc" explicitly.  we don't need
    to generalize resuming exceptions.  NOTE: I'm NOT the believer of
    the "explicit better than implicit" principle though.

							matz.