m4_warn test fails, removing autom4te.cache helps

[Pavel Roskin]

Hello!

Test 13 (m4_warn) fails in the CVS version of Autoconf.  It turns out that
autoconf doesn't report any warnings at all until autom4te.cache is
removed:

$ cat >configure.ac <<EOF
> m4_warn([foo],  [foo])
> m4_warn([bar],    [bar])
> m4_warn([syntax], [syntax])
> EOF
$ rm -rf autom4te.cache
$ autoconf
configure.ac:3: warning: syntax
$ autoconf
$ rm -rf autom4te.cache
$ autoconf
configure.ac:3: warning: syntax
$

Removing autom4te.cache between autoconf invocations fixes the test, but I
believe that the actual problem is in autoconf, not in the test.

-- 
Regards,
Pavel Roskin