GNU bug report logs - #38081
27.0.50; compilation-error-properties error if file is nil

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Subject: 27.0.50; compilation-error-properties error if file is nil
Date: Tue, 05 Nov 2019 20:06:57 -0500
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If the FILE argument in `compilation-error-regexp-alist-alist`
is a function that returns nil on a matched line, then
`compilation-error-properties` throws an error when trying to
do a `string-match` against FILE and elements in
`compilation-transform-file-match-alist`.

It seems like there should be a check that the FILE is in fact
non-nil.

Quick recipe that should reproduce the error:

    (require 'compile)

    ;; function that is supposed to find appropriate file name
    (defun my-determine-file-name ())

    (define-compilation-mode my-mode "MM"
      (setq-local compilation-error-regexp-alist '(my-err))
      (setq-local compilation-error-regexp-alist-alist
                  '((my-err "\\([0-9]+\\):\\([0-9]+\\)"
                            my-determine-file-name 1 2))))

    (compilation-start "echo -e 1:2\n3:4" 'my-mode)



In GNU Emacs 27.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.22.30)
 of 2019-11-03 built on noah-M51AC
Repository revision: 58fde6362f88e1d943ae033bda31becc67892112
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.11906000
System Description: Ubuntu 18.04.3 LTS

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
Mark set
eval-buffer: Symbol=E2=80=99s function definition is void: define-compilati=
on-modeError during redisplay: (jit-lock-function 1) signaled (wrong-type-a=
rgument stringp nil)
error in process filter: compilation-error-properties: Wrong type argument:=
 stringp, nil
error in process filter: Wrong type argument: stringp, nil
MM exited abnormally with code 127
Error during redisplay: (jit-lock-function 94) signaled (wrong-type-argumen=
t stringp nil)

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Memory information:
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 (strings 32 16944 1873)
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