GNU bug report logs - #78884
30.1; peg-parse does not treat its arguments as sequence

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#78884: closed (30.1; peg-parse does not treat its arguments
 as sequence)
Date: Sat, 28 Jun 2025 03:16:05 +0000

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Your message dated Fri, 27 Jun 2025 23:15:48 -0400
with message-id <jwvbjq8r1zg.fsf-monnier+emacs <at> gnu.org>
and subject line Re: bug#78884: 30.1; peg-parse does not treat its arguments as sequence
has caused the debbugs.gnu.org bug report #78884,
regarding 30.1; peg-parse does not treat its arguments as sequence
to be marked as done.

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help-debbugs <at> gnu.org.)


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78884: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=78884
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From: Tim Landscheidt <tim <at> tim-landscheidt.de>
To: bug-gnu-emacs <at> gnu.org
Subject: 30.1; peg-parse does not treat its arguments as sequence
Date: Tue, 24 Jun 2025 00:12:11 +0000

The docstring for Emacs 30.1's peg-parse reads:

| (peg-parse &rest PEXS)

| Match PEXS at point.
| PEXS is a sequence of PEG expressions, implicitly combined with ‘and’.
| Returns STACK if the match succeed and signals an error on failure,
| moving point along the way.

However, it will fail with (for example) "Wrong type
argument: listp" when called as such:

| ELISP> (with-temp-buffer
|          (insert "ABCDEF")
|          (goto-char (point-min))
|          (peg-parse
|           (bob)
|           "ABC"))
| *** Eval error ***  Wrong type argument: listp, "ABC"
| ELISP>

An explicit sequence with "and" works:

| ELISP> (with-temp-buffer
|          (insert "ABCDEF")
|          (goto-char (point-min))
|          (peg-parse
|           (and
|            (bob)
|            "ABC")))
| t

| ELISP>

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From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Tim Landscheidt <tim <at> tim-landscheidt.de>
Cc: 78884-done <at> debbugs.gnu.org
Subject: Re: bug#78884: 30.1; peg-parse does not treat its arguments as
 sequence
Date: Fri, 27 Jun 2025 23:15:48 -0400

> Can you check that the quick-fix below fixes things on your side (and
> not just for your example)?

Well, I pushed it to `master`, and I'm closing the bug.
In case it's not fully fixed, feel free to reopen, of course.


        Stefan

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