A quizz: where are these guys coming from...

[Akim Demaille]

I was about to check another sanity check in, but unfortunately the
current Autoconf does not pass it :)

Since it's probably a lot of fun to track down the origin of the
following output, since I know some of the audience of autoconf@ likes
this kind of tracking, let's track it down altogether :)

The idea of the test is that there should be no output at all but
empty lines, or lines of comments.  But since `divert' throws
everything to void anyway, let's first disable divert.  Hence this
test:

~/src/ace % m4 -D divert autoconf.m4 | egrep -v '^(#.*)?$'       nostromo 14:29
                                                   -*- Autoconf -*-
                                                   -*- Autoconf -*-
 # _AC_PROG_F77_V
 # AC_F77_FUNC


I understand the first two guys, and actually I will put them in
comments, so that's no problem.  But I don't know where the spaces
before the two last guys are coming from.

Happy tracking!