Package: emacs;
Reported by: Juan José García Ripoll <juanjose.garcia.ripoll <at> csic.es>
Date: Tue, 4 May 2021 08:56:02 UTC
Severity: normal
Found in version 27.1.90
View this message in rfc822 format
From: Juan José García Ripoll <juanjose.garcia.ripoll <at> csic.es> To: 48219 <at> debbugs.gnu.org Subject: bug#48219: 27.1.90; CL-LOOP facility fails with hash tables Date: Tue, 04 May 2021 10:46:57 +0200
(cl-loop
for database in nil
for aux = (message "databse: %S" database)
for entry being the hash-values of database
do (message "FOO %S" database))
This code should do nothing, because variable DATABASE runs over an empty list. Yet the macroexpansion of the loop produces code that tries to run over the entries of DATABASE, which is NIL.
(cl--block-wrapper
(catch '--cl-block-nil--
(let* ((--cl-var-- nil)
(database nil)
(aux nil))
(cl-block --cl-finish--
(maphash (lambda (--cl-var-- entry)
(or (consp --cl-var--) (cl-return-from --cl-finish-- nil))
(setq database (car --cl-var--))
(setq aux (message "databse: %S" database))
(message "FOO %S" database)
(setq --cl-var-- (cdr --cl-var--)))
database))
nil)))
Compare this with
(cl-prettyprint
(macroexpand '(cl-loop
for database in nil
for aux = (message "databse: %S" database)
do (message "FOO %S" database))))
(cl--block-wrapper
(catch '--cl-block-nil--
(let* ((--cl-var-- nil)
(database nil)
(aux nil))
(while (consp --cl-var--)
(setq database (car --cl-var--))
(setq aux (message "databse: %S" database))
(message "FOO %S" database)
(setq --cl-var-- (cdr --cl-var--)))
nil)))
Here the resulting code properly checks for the --cl-var-- variabel that runs the loop
In GNU Emacs 27.1.90 (build 1, x86_64-w64-mingw32)
Repository revision: 37eba74d609c74bcf9ac3c481a29377913783ac4
Repository branch: HEAD
Windowing system distributor 'Microsoft Corp.', version 10.0.19042
System Description: Microsoft Windows 10 Pro (v10.0.2009.19042.928)
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Memory information:
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--
Juan José García Ripoll
Quantum Information and Foundations Group
Institute of Fundamental Physics IFF-CSIC
Calle Serrano 113b, Madrid 28006 Spain
http://quinfog.hbar.es - http://juanjose.garciaripoll.com
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