From: Noam Postavsky <npostavs@users.sourceforge.net>
To: 23443@debbugs.gnu.org
Subject: bug#23443: 25.0.93; Temporary change to syntax-table is in effect during syntax-propertize
Date: Wed, 4 May 2016 06:41:28 -0400 [thread overview]
Message-ID: <CAM-tV--a-BruK4dSgAZ2ojbZ44j=rhp4+UZO5HA481HJMJE1PA@mail.gmail.com> (raw)
[-- Attachment #1: Type: text/plain, Size: 862 bytes --]
On the emacs-25 and master branches, changing the syntax-table
temporarily affects the table used during syntax-propertize. This does
not happen in 24.5 (unless the difference is just a timing thing?).
This triggers an infinite loop when expanding certain snippets with
yasnippet in haskell-mode (see [1] and [2]).
Attached is a simplified reproducer, run as
emacs -Q -l synprop-bug.el
In Emacs 25+, this results in the message
Error during redisplay: (internal--syntax-propertize 2) signaled
(error "syntax table is changed to standard-syntax-table during syntax
propertize")
In Emacs 24.5, it runs without a problem. It's not entirely clear to
me who should be reponsible for ensuring the right syntax-table during
syntax-propertize.
[1]: https://github.com/capitaomorte/yasnippet/issues/687
[2]: https://github.com/haskell/haskell-mode/issues/1315
[-- Attachment #2: synprop-bug.el --]
[-- Type: text/x-emacs-lisp, Size: 824 bytes --]
(defun test-check-syntax-table (begin end)
(unless (eq (syntax-table) test-syntax-prop-mode-syntax-table)
(error "syntax table is changed to %s during syntax propertize"
(if (eq (syntax-table) (standard-syntax-table))
'standard-syntax-table
'other-syntax-table))))
(define-derived-mode test-syntax-prop-mode prog-mode "TestSyntaxProp"
"A mode for testing syntax-propertize bug(?)."
(setq-local syntax-propertize-function #'test-check-syntax-table)
(setq-local font-lock-defaults
'(nil nil nil nil nil
(font-lock-syntactic-face-function . ignore)
(parse-sexp-lookup-properties . t))))
(switch-to-buffer "tt")
(test-syntax-prop-mode)
(erase-buffer)
(insert "foo")
(with-syntax-table (standard-syntax-table)
(scan-sexps 1 1))
next reply other threads:[~2016-05-04 10:41 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-04 10:41 Noam Postavsky [this message]
2016-05-08 0:58 ` bug#23443: 25.0.93; Temporary change to syntax-table is in effect during syntax-propertize Dmitry Gutov
2016-05-08 18:51 ` Noam Postavsky
2016-05-08 18:53 ` Dmitry Gutov
2016-05-08 18:58 ` Noam Postavsky
2016-05-08 19:12 ` Dmitry Gutov
2016-05-12 10:05 ` Noam Postavsky
2016-05-13 5:49 ` Andreas Röhler
2016-05-16 18:28 ` Dmitry Gutov
2016-05-13 5:55 ` Andreas Röhler
2016-05-10 17:34 ` Andreas Röhler
2016-05-10 20:42 ` Dmitry Gutov
2016-05-11 5:20 ` Andreas Röhler
2016-05-11 9:20 ` Dmitry Gutov
2016-05-11 12:13 ` Andreas Röhler
2016-05-11 12:31 ` Dmitry Gutov
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