GNU bug report logs - #26073
How should cl-symbol-macrolet interact with rebindings?

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From: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
To: Noam Postavsky <npostavs <at> users.sourceforge.net>
Cc: 26073 <at> debbugs.gnu.org, Philipp Stephani <p.stephani2 <at> gmail.com>, Paul Pogonyshev <pogonyshev <at> gmail.com>
Subject: bug#26073: workaround
Date: Thu, 08 Feb 2018 21:43:01 -0500

> The examples given still fail on current master.
>
> (require 'generator)
> (setq lexical-binding t) ; for easier *scratch* evaluation
> (iter-do (y (funcall (iter-lambda (x)
>                        (dolist (it x)
>                          (let ((y (mapcar (lambda (it) (- it)) it)))
>                            (iter-yield y))))
>                      '((1 2) ( 3 4))))
>   (print y)) ;=> Lisp error: (wrong-type-argument number-or-marker-p (1 2))
>
> (iter-next (funcall (iter-lambda ()
>                       (let ((it 1))
>                         (iter-yield (funcall (lambda (it) (- it)) (1+ it)))))))  ;=> -1

Duh, the code failed to handle vars introduced by `lambda' (and
`condition-case').  I installed a patch which fixes the above example
(and hopefully the rest, but given my past track record on this you'd
be foolish to believe it).


        Stefan

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