I'll just reference the couple of bug reports I have found about the issue. This is fixed upstream in ply, however there has not been a new release, you may want to add the patches to the RPM. https://github.com/dabeaz/ply/issues/63 https://code.google.com/p/chromium/issues/detail?id=484119 Note that this seems to effect more than just the chromium builds, there is a reference to the slimit build being broken as well.
python-ply-3.6-2.fc23 has been submitted as an update for Fedora 23. https://admin.fedoraproject.org/updates/python-ply-3.6-2.fc23
Package python-ply-3.6-2.fc23: * should fix your issue, * was pushed to the Fedora 23 testing repository, * should be available at your local mirror within two days. Update it with: # su -c 'yum update --enablerepo=updates-testing python-ply-3.6-2.fc23' as soon as you are able to. Please go to the following url: https://admin.fedoraproject.org/updates/FEDORA-2015-13668/python-ply-3.6-2.fc23 then log in and leave karma (feedback).
python-ply-3.6-2.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.