Shouldn't the doc string mention what the return value is? At least
one use of the function in the Emacs source code makes use of this
value:
(let* ((columns compilation-error-screen-columns) ; buffer's local value
(last 1)
(loc (compilation-next-error (or n 1) nil
(or compilation-current-error
compilation-messages-start
(point-min))))
(end-loc (nth 2 loc))
(marker (point-marker)))
...)
In GNU Emacs 22.0.96.1 (i386-mingw-nt5.1.2600)
of 2007-03-21 on LENNART-69DE564
Windowing system distributor `Microsoft Corp.', version 5.1.2600
configured using `configure --with-gcc (3.4) --cflags -Ic:/g/include'
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