regcomp failure

[Roland McGrath]

> This test program appears to consume all memory and eventually crash
> when run with the latest libc from cvs.

Thanks for the report.  I've put the test case into libc (along with a hack
to the test infrastructure so it will fail with a resource limit instead of
swallowing the machine).  Isamu will have to look at the regex bug itself.

posix/bug-regex15 is an expected failure until we get that fix.