bug#69730: Segfault in (spawn) when passed wrong port

[Tomas Volf]

Greetings,

When I pass #f to spawn as a port, it just segfaults:

    $ guile -c '(spawn "true" (list "") #:error #f)'
    Segmentation fault

Ignoring the fact whether #f should be an accepted value (I think it would be
more elegant and portable then (open-output-file "/dev/null")), I would not
expect invalid value in an interpreted language to cause a segfault.  If the
value is indeed invalid, it should throw an error.

Original report: https://emacs.ch/@kakafarm/112075808549752692

Have a nice day,
Tomas Volf

--
There are only two hard things in Computer Science:
cache invalidation, naming things and off-by-one errors.

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