GNU bug report logs - #72328
[PATCH] Nested backquote in pcase

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Package: emacs;

Reported by: Thuna <thuna.cing <at> gmail.com>

Date: Sun, 28 Jul 2024 01:06:02 UTC

Severity: normal

Tags: patch

Done: Stefan Monnier <monnier <at> iro.umontreal.ca>

Bug is archived. No further changes may be made.

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From: Thuna <thuna.cing <at> gmail.com>
To: 72328 <at> debbugs.gnu.org
Subject: bug#72328: [PATCH] Nested backquote in pcase
Date: Sun, 28 Jul 2024 02:40:00 +0200

[Message part 1 (text/plain, inline)]
Assuming a hypothetical `(pcase-assert OBJ PAT)' I would expect the
following to succeed:

  (pcase-assert '`,nil ``,nil)
  (pcase-assert '`,1 ``,,(pred integerp))
  (pcase-assert '`,@(list) ``,@,`(list . ,_))

which is to say: a comma should match its argument as a pattern only if
it escapes the original backquote (currently comma at all depths
"escape" the original backquote).

In case there is any interest in this, I have prepared a patch which
both adds the above as tests to pcase-tests.el and implements them in
pcase.el.


[0001-Handle-nested-backquotes-in-pcase.patch (text/x-patch, attachment)]
This bug report was last modified 237 days ago.

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