bug#52169: 28.0.60; "Args out of range" when completing shell command

["Kévin Le Gouguec" <kevin.legouguec@gmail.com>]

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Kévin Le Gouguec <kevin.legouguec@gmail.com> writes:

> Hello,
>
> This is sort of a garbage-in, garbage-out situation, so I'll just let
> the reproducer speak for itself:
>
> $ emacs -Q
> M-! ./nosuchcommand C-b TAB
>
> - In Emacs 27.1, this simply says "[No match]".
> - In Emacs 28.0.60, this errors out:
>
>> completion--some: Args out of range: "./nosuchcomma", 0, 14
>
> I'm attaching the backtrace obtained with M-x toggle-debug-on-error.
>
> I'm not on the most ideal setup for compiling ATM, so I apologize for
> not bisecting this (and for not trying with 27.2; Debian stable only has
> 27.1); I'll get to it eventually if no-one beats me.

Alright, if I didn't botch the bisection, then we're looking at
2021-04-23 "Fix small bug in 'completion-table-subvert'." (3806d2168b).
Bisection session attached, FWIW.


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Bisect Log (11)
git bisect start '6dabbddb5f' 'b702225619'
6dabbddb5f bad Merge from origin/emacs-27
b702225619 good Merge from origin/emacs-27

git bisect good 3c051db646b34995c144327ed462a92ffbb41f86
3c051db646 good * lisp/files-x.el: Use lexical-binding

git bisect good c7555f037ae7194fc331fb65c34c280680028b80
c7555f037a good Fix :scale's affect on :width and :height (bug#47819)

git bisect good aaf6b6bf80805d18180e1c16350e9473716f5915
aaf6b6bf80 good Ensure that argument to 'verify' is a constant expression.

git bisect bad 21b3ceea3b0321559e9cbdcb034d9c66d3264d89
21b3ceea3b bad ; * etc/NEWS: Fix last change.

git bisect bad 3995f0515ab0b0e359f9976d589eed45f38eaa6d
3995f0515a bad Expand documentation on nontrivial completion boundaries.

git bisect good 522c34f0e80f60969861b0dc34bc7105249f9994
522c34f0e8 good Remove the binding for xref-quit-and-goto-xref

git bisect good 344f769491a84b6d47ee3722054b214167572219
344f769491 good Add support for using a TLS client certificate with 'erc-tls' (bug#47788)

git bisect good 804f5acda4bd947f058c6843e373797202314467
804f5acda4 good Revert "Remove the binding for xref-quit-and-goto-xref"

git bisect bad 3806d2168bdc36796d2dfac5f743582f0ce71c72
3806d2168b bad Fix small bug in 'completion-table-subvert'.

3806d2168bdc36796d2dfac5f743582f0ce71c72 is the first bad commit