GNU bug report logs - #21378
R6RS guard's else chokes on multiple expressions

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: taylanbayirli <at> gmail.com (Taylan Ulrich
 Bayırlı/Kammer)
Subject: bug#21378: closed (Re: R6RS guard's else chokes on multiple
 expressions)
Date: Sun, 30 Aug 2015 11:53:02 +0000

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Your bug report

#21378: R6RS guard's else chokes on multiple expressions

which was filed against the guile package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 21378 <at> debbugs.gnu.org.

-- 
21378: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=21378
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: taylanbayirli <at> gmail.com (Taylan Ulrich Bayırlı/Kammer)
To: 21378-done <at> debbugs.gnu.org
Subject: Re: R6RS guard's else chokes on multiple expressions
Date: Sun, 30 Aug 2015 13:52:39 +0200

Please ignore this bug report, since it was my fault.  I had a foreign
(rnrs exceptions) library in my load-path that took precedence.

Sorry about the noise.

Taylan

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From: taylanbayirli <at> gmail.com (Taylan Ulrich Bayırlı/Kammer)
To: bug-guile <at> gnu.org
Subject: R6RS guard's else chokes on multiple expressions
Date: Sat, 29 Aug 2015 23:52:04 +0200

It seems that whatever macro tries to match the guard expression's
else-clause, fails to do so when the clause contains more than one
expression, and so adds a default "else re-raise" clause after the
existing else clause.

I couldn't figure out where this happens.  I grepped the whole
source tree for 're-raise' and only found it twice in a comment.

Transcript showcasing bug:

taylan <at> T420:~$ guile
GNU Guile 2.0.11
Copyright (C) 1995-2014 Free Software Foundation, Inc.

Guile comes with ABSOLUTELY NO WARRANTY; for details type `,show w'.
This program is free software, and you are welcome to redistribute it
under certain conditions; type `,show c' for details.

Enter `,help' for help.
scheme@(guile-user)> ,use (rnrs exceptions)
scheme@(guile-user)> (guard (exc (else #f #f)) #f)
While compiling expression:
ERROR: Syntax error:
unknown file:3:12: cond: else must be the last clause in subform (else #f #f) of (cond (else #f #f) (else (re-raise)))
scheme@(guile-user)>

Taylan

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