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From: Marius Vollmer <marius.vollmer@uni-dortmund.de>
Cc: jantien@xs4all.nl, guile-devel@gnu.org
Subject: Re: stumped by scm_car/scm_cdr
Date: Wed, 29 Sep 2004 17:37:46 +0200	[thread overview]
Message-ID: <ljmzz984s5.fsf@troy.dt.e-technik.uni-dortmund.de> (raw)
In-Reply-To: <16725.64761.208412.328474@byrd.xs4all.nl> (Han-Wen Nienhuys's message of "Sun, 26 Sep 2004 01:19:21 +0200")

Han-Wen Nienhuys <hanwen@xs4all.nl> writes:

> I tried setting a breakpoint on this function, but if I do, the run
> completes as expected normally.

One more idea: it might be that you (harmlessly) used SCM_CAR or
SCM_CDR on a non-pair but scm_car/scm_cdr are now complaining about
this by throwing an error.  That error might happen in a context where
throwing does not work, or might lead to endless recursion, or some
other anomaly.  Try replacing the call to scm_wrong_type_arg_msg in
scm_car and scm_cdr with a simple abort.

(This does not explain why the bug disappears when debugging it, so it
is an unlikely scenario...  Typical case of a Heisenbug...)


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  reply	other threads:[~2004-09-29 15:37 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2004-09-24 23:29 stumped by scm_car/scm_cdr Han-Wen Nienhuys
2004-09-25 15:54 ` Marius Vollmer
2004-09-25 23:19   ` Han-Wen Nienhuys
2004-09-29 15:37     ` Marius Vollmer [this message]
2004-10-06 23:44       ` Han-Wen Nienhuys
2004-10-07 18:52         ` Han-Wen Nienhuys
2004-10-07 21:55           ` Marius Vollmer
2004-10-07 22:12         ` Marius Vollmer
2004-10-07 22:51           ` Han-Wen Nienhuys
2004-10-07 23:41             ` Han-Wen Nienhuys
2004-10-18 17:47             ` Marius Vollmer
2004-10-24 12:25               ` Han-Wen Nienhuys
2004-11-04 16:49                 ` Marius Vollmer
2004-11-08  6:48           ` Dirk Herrmann

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