Upstream 5.16.0 perl release has a bug in XS::APItest. The problem is in accessing unallocated memory. Reported to upstream mailing list with proposed patch (http://thread.gmane.org/gmane.comp.lang.perl.perl5.porters/109408). We need to fix it after bumping 5.16.0 into Fedora.
This proposed fix has been merged into upstream as commit: commit 4a808ed163df1057031bc6d085300fe1ef6f57d2 Author: Michael Schroeder <mls> Date: Fri Jun 8 20:29:54 2012 -0700 [perl #111610] Trouble with XS-APItest/t/clone-with-stack.t
perl-5.16.1-230.fc18 has been submitted as an update for Fedora 18. https://admin.fedoraproject.org/updates/perl-5.16.1-230.fc18
Package perl-5.16.1-230.fc18: * should fix your issue, * was pushed to the Fedora 18 testing repository, * should be available at your local mirror within two days. Update it with: # su -c 'yum update --enablerepo=updates-testing perl-5.16.1-230.fc18' as soon as you are able to. Please go to the following url: https://admin.fedoraproject.org/updates/FEDORA-2012-13814/perl-5.16.1-230.fc18 then log in and leave karma (feedback).
perl-5.16.1-231.fc18 has been submitted as an update for Fedora 18. https://admin.fedoraproject.org/updates/perl-5.16.1-231.fc18
perl-5.16.1-231.fc18 has been pushed to the Fedora 18 stable repository. If problems still persist, please make note of it in this bug report.