bug#48177: 28.0.50; process-file doesn't correctly handle quoted file names for INFILE

[Philipp Stephani <p.stephani2@gmail.com>]

Am So., 2. Mai 2021 um 23:53 Uhr schrieb Philipp Stephani
<p.stephani2@gmail.com>:
>
> Am So., 2. Mai 2021 um 23:51 Uhr schrieb Philipp Stephani
> <p.stephani2@gmail.com>:
> >
> >
> > Evaluate something like
> >
> > (process-file "/:/bin/true" "/:/dev/null")
> >
> > This gives an error
> >
> > (file-missing "Opening process input file" "No such file or directory" "/:/dev/null")
> >
> > Other magic filenames for INFILE (such as "/ssh:localhost:/dev/null")
> > work as expected.  The docstring for `process-file' says that INFILE is
> > handled by filename handlers, so I think this should work for quoted
> > filenames as well.
> >
>
> Same for
> (process-file "/:/bin/true" nil '((:file "/:/dev/null") "/dev/null"))

Other forms that I think should work, but fail:

(let ((default-directory "/:/usr/"))
  (process-file "/:/bin/true" nil '(t "/:/dev/null")))

(let ((temporary-file-directory "/:/tmp/"))
  (process-file "/:/bin/true" nil '(t "/dev/null")))