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* bug#48219: 27.1.90; CL-LOOP facility fails with hash tables
@ 2021-05-04  8:46 Juan José García Ripoll
  0 siblings, 0 replies; only message in thread
From: Juan José García Ripoll @ 2021-05-04  8:46 UTC (permalink / raw)
  To: 48219

 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.

 (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--)))

Compare this with

 (macroexpand '(cl-loop
 for database in nil
 for aux = (message "databse: %S" database)
 do (message "FOO %S" database))))

 (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--)))

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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Mark set
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Calendar ~/Nextcloud/Documents/Notes/calendar.ics unchanged
Configured using:
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Major mode: Summary

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Memory information:
((conses 16 1068058 390211)
 (symbols 48 37670 37)
 (strings 32 286486 56033)
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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 -

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2021-05-04  8:46 bug#48219: 27.1.90; CL-LOOP facility fails with hash tables Juan José García Ripoll

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