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Re: About `catch' and `throw'


From: David Combs
Subject: Re: About `catch' and `throw'
Date: Sat, 5 Jan 2013 00:57:12 +0000 (UTC)

In article <address@hidden>,
Pascal J. Bourguignon <address@hidden> wrote:
>...

>The point is that catch/throw is a dynamic mechanism, not a lexical one.
>So it is bad to say "outside", since this has a spacial conotation.
>
>throw can be used WHEN catch is executing, or WHEN it is not.
>
>If you call (throw 'something result) WHEN there's a (catch 'something …)
>executing, then the control will pass from the throw expression to the
>catch expression, and the catch expression will return the result
>passed to throw.
>
>It's only a question of time, of WHEN catch is being evaluated and WHEN
>throw is evaluated.
>
Would you then say that when throw is triggered, it starts looking
up the stack (to older items) for a (matching?) catch, then collapses
the part of the stack it came from (where the throw was) up to
that point, fixes things up, and continues within the catch?

And if there is no catch, then it does <you fill in the answer>.


>
>
>
...., but the current implementation
>(even in emacs-24) is full of bugs.  

In your opinion, is this going to get fixed anytime soon?

Or has it been there for decades, and probably will remain
for decades to come?


Thanks,

David




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