The generators have produced the following `provides' for the latest build of perl-Dist-Zilla: perl(ExtUtils::MakeMaker{{) This is caused by a match from Dist-Zilla-5.027/lib/Dist/Zilla/Plugin/MakeMaker.pm: use ExtUtils::MakeMaker{{ defined $eumm_version && 0+$eumm_version ? ' ' . $eumm_version : '' }}; This actually isn't code but a part of a multiline string assignment. Consider filtering modules with invalid characters in them.