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From: ludovic.courtes@laas.fr (Ludovic Courtès)
Cc: guile-user@gnu.org
Subject: Re: debugging scheme module
Date: Thu, 07 Dec 2006 13:54:05 +0100	[thread overview]
Message-ID: <87irgnkgsy.fsf@laas.fr> (raw)
In-Reply-To: <200612071220.06887.al@iac.spb.ru> (Al Nikolov's message of "Thu,  7 Dec 2006 12:20:05 +0300")

Hi,

Al Nikolov <al@iac.spb.ru> writes:

> Fatal error: [library-name] wrong-type-arg: ("caddar" "Wrong type argument
> in position ~A: ~S" (1 ()) #f)

This means that at some point, `caddar' is invoked and is passed `#f'
instead of a list.  :-)

> Since my scheme code is bigger than two parenthesis and three lines, i
> feel myself totally embarassed by having absolutely no idea where to look
> for the trouble and what those "~A"s and "#f"s mean.

You could try the following:

  (read-enable 'debug)
  (debug-enable 'debug)

This has to be done early enough, ideally when Guile starts up (or when
your first Scheme file gets read).  If you use 1.8, then it should show
a complete backtrace instead of just an error line.

Alternatively, you can run `guile' with the `--debug' option (if that is
an option for you).

Hope this helps,
Ludovic.


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  reply	other threads:[~2006-12-07 12:54 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-12-07  9:20 debugging scheme module Al Nikolov
2006-12-07 12:54 ` Ludovic Courtès [this message]
2006-12-12 21:36   ` Neil Jerram

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