GNU bug report logs - #21201
25.0.50; (buffer-modified-p) errors inside cl-letf

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Package: emacs;

Reported by: bruce.connor.am <at> gmail.com

Date: Thu, 6 Aug 2015 19:48:01 UTC

Severity: minor

Tags: fixed, patch

Merged with 29371

Found in versions 25.0.50, 26.0.50

Fixed in version 27.1

Done: Noam Postavsky <npostavs <at> gmail.com>

Bug is archived. No further changes may be made.

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From: Artur Malabarba <bruce.connor.am <at> gmail.com>
To: 21201 <at> debbugs.gnu.org
Subject: bug#21201: 25.0.50; (buffer-modified-p) errors inside cl-letf
Date: Thu, 6 Aug 2015 20:47:34 +0100

From emacs -Q, run the following:

(cl-letf (((buffer-modified-p)))
  (insert "ookok"))

You'll get an error from trying to set a nil buffer.

Using `(buffer-modified-p (current-buffer))' instead works.

Backtrace:
Debugger entered--Lisp error: (wrong-type-argument stringp nil)
  set-buffer(nil)
  (save-current-buffer (set-buffer nil) (set-buffer-modified-p old))
  (unwind-protect (insert "ookok") (save-current-buffer (set-buffer
nil) (set-buffer-modified-p old)))
  (let* ((old (buffer-modified-p))) (unwind-protect (insert "ookok")
(save-current-buffer (set-buffer nil) (set-buffer-modified-p old))))
  eval((let* ((old (buffer-modified-p))) (unwind-protect (insert
"ookok") (save-current-buffer (set-buffer nil) (set-buffer-modified-p
old)))) nil)
  elisp--eval-last-sexp(nil)
  eval-last-sexp(nil)
  funcall-interactively(eval-last-sexp nil)
  call-interactively(eval-last-sexp nil nil)
  command-execute(eval-last-sexp)
This bug report was last modified 6 years and 271 days ago.

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