bug#55278: json-parse-string

[Richard Stallman]

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    > (unless (ignore-errors (equal [] (json-parse-string "[]")))
    >   (warn "osm: libjansson is not available"))

Assuming that now this warning will actually appear,
it still has two problems.

The text of the warning is not clear.  It fails to say what the
practical consequences are: that OSM simply will not work.

It should be an error, not a warning.  And I suggest text
saying "OSM can't run, because Emacs was built without libjansson."

-- 
Dr Richard Stallman (https://stallman.org)
Chief GNUisance of the GNU Project (https://gnu.org)
Founder, Free Software Foundation (https://fsf.org)
Internet Hall-of-Famer (https://internethalloffame.org)