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Re: Line/column numbers in user supplied exception handlers

From: Neil Jerram
Subject: Re: Line/column numbers in user supplied exception handlers
Date: 05 Jul 2001 20:42:19 +0100
User-agent: Gnus/5.0808 (Gnus v5.8.8) Emacs/20.7

>>>>> "Marius" == Marius Vollmer <address@hidden> writes:

    Marius> "Dale P. Smith" <address@hidden> writes:
    >> I also found this in the archives:
    >> It sounds like a great idea.  Has anyone thought about it?

    Marius> Yes, I like it, too.  That is, I like the general idea of
    Marius> separating the notion of error handlers and non-local
    Marius> exits.  Or put differently, I think the error handler
    Marius> should be invoked in the dynamic context of the error.  If
    Marius> it so desires, the error handler can exit non-locally (or
    Marius> pass control on to the next error handler, but it can't
    Marius> return normally).

I'd like to experiment with this; what I have in mind is, before
`scm_ithrow (key, arg_list, 1);' in scm_error:

    scm_c_run_hook (scm_error_hook, scm_cons (key, arg_list));

Then, just as you say, one of the hook procedures can exit non-locally
if it wants to; but if none of them do, the scm_ithrow will happen.

(This ties in with my debugger experimentation of course, one of the
procedures for error-hook would implement `debug-on-error'.)


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