Your package slic3r failed to build from source in current rawhide. http://koji.fedoraproject.org/koji/taskinfo?taskID=5771593 For details on mass rebuild see https://fedoraproject.org/wiki/Fedora_20_Mass_Rebuild
This bug appears to have been reported against 'rawhide' during the Fedora 20 development cycle. Changing version to '20'. More information and reason for this action is here: https://fedoraproject.org/wiki/BugZappers/HouseKeeping/Fedora20
Affects both Rawhide and F20.
*** Bug 1019827 has been marked as a duplicate of this bug. ***
So this might not be related to missing perl-Language-Expr at all :( It kight be related to perl-Moo, I'll investigate.
http://koji.fedoraproject.org/koji/taskinfo?taskID=6075948 http://koji.fedoraproject.org/koji/taskinfo?taskID=6075925 Will test if it is running fine.
slic3r-0.9.10b-5.fc20,perl-Role-Tiny-1.003002-1.fc20,perl-Moo-1.003001-2.fc20 has been submitted as an update for Fedora 20. https://admin.fedoraproject.org/updates/slic3r-0.9.10b-5.fc20,perl-Role-Tiny-1.003002-1.fc20,perl-Moo-1.003001-2.fc20
Package slic3r-0.9.10b-5.fc20, perl-Role-Tiny-1.003002-1.fc20, perl-Moo-1.003001-2.fc20: * should fix your issue, * was pushed to the Fedora 20 testing repository, * should be available at your local mirror within two days. Update it with: # su -c 'yum update --enablerepo=updates-testing slic3r-0.9.10b-5.fc20 perl-Role-Tiny-1.003002-1.fc20 perl-Moo-1.003001-2.fc20' as soon as you are able to. Please go to the following url: https://admin.fedoraproject.org/updates/FEDORA-2013-19510/slic3r-0.9.10b-5.fc20,perl-Role-Tiny-1.003002-1.fc20,perl-Moo-1.003001-2.fc20 then log in and leave karma (feedback).
slic3r-0.9.10b-5.fc20, perl-Role-Tiny-1.003002-1.fc20, perl-Moo-1.003001-2.fc20 has been pushed to the Fedora 20 stable repository. If problems still persist, please make note of it in this bug report.