/usr/lib/x86_64-linux-gnu/perl5/ is in libmouse-perl 2.3.0-1+b1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/x86_64-linux-gnu/perl5/5.20/
/usr/lib/x86_64-linux-gnu/perl5/5.20/ouse.pm
/usr/lib/x86_64-linux-gnu/perl5/5.20/Mouse.pm
/usr/lib/x86_64-linux-gnu/perl5/5.20/Squirrel.pm
/usr/lib/x86_64-linux-gnu/perl5/5.20/auto/
/usr/lib/x86_64-linux-gnu/perl5/5.20/auto/Mouse/
/usr/lib/x86_64-linux-gnu/perl5/5.20/auto/Mouse/Mouse.so
/usr/lib/x86_64-linux-gnu/perl5/5.20/auto/Mouse/Mouse.bs
/usr/lib/x86_64-linux-gnu/perl5/5.20/Test/
/usr/lib/x86_64-linux-gnu/perl5/5.20/Test/Mouse.pm
/usr/lib/x86_64-linux-gnu/perl5/5.20/Squirrel/
/usr/lib/x86_64-linux-gnu/perl5/5.20/Squirrel/Role.pm
/usr/lib/x86_64-linux-gnu/perl5/5.20/Mouse/
/usr/lib/x86_64-linux-gnu/perl5/5.20/Mouse/Role.pm
/usr/lib/x86_64-linux-gnu/perl5/5.20/Mouse/Spec.pm
/usr/lib/x86_64-linux-gnu/perl5/5.20/Mouse/TypeRegistry.pm
/usr/lib/x86_64-linux-gnu/perl5/5.20/Mouse/Object.pm
/usr/lib/x86_64-linux-gnu/perl5/5.20/Mouse/PurePerl.pm
/usr/lib/x86_64-linux-gnu/perl5/5.20/Mouse/Exporter.pm
/usr/lib/x86_64-linux-gnu/perl5/5.20/Mouse/Util.pm
/usr/lib/x86_64-linux-gnu/perl5/5.20/Mouse/XS.pod
/usr/lib/x86_64-linux-gnu/perl5/5.20/Mouse/Tiny.pod
/usr/lib/x86_64-linux-gnu/perl5/5.20/Mouse/Tiny.pm
/usr/lib/x86_64-linux-gnu/perl5/5.20/Mouse/Util/
/usr/lib/x86_64-linux-gnu/perl5/5.20/Mouse/Util/MetaRole.pm
/usr/lib/x86_64-linux-gnu/perl5/5.20/Mouse/Util/TypeConstraints.pm
/usr/lib/x86_64-linux-gnu/perl5/5.20/Mouse/Meta/
/usr/lib/x86_64-linux-gnu/perl5/5.20/Mouse/Meta/Class.pm
/usr/lib/x86_64-linux-gnu/perl5/5.20/Mouse/Meta/TypeConstraint.pm
/usr/lib/x86_64-linux-gnu/perl5/5.20/Mouse/Meta/Method.pm
/usr/lib/x86_64-linux-gnu/perl5/5.20/Mouse/Meta/Role.pm
/usr/lib/x86_64-linux-gnu/perl5/5.20/Mouse/Meta/Attribute.pm
/usr/lib/x86_64-linux-gnu/perl5/5.20/Mouse/Meta/Module.pm
/usr/lib/x86_64-linux-gnu/perl5/5.20/Mouse/Meta/Role/
/usr/lib/x86_64-linux-gnu/perl5/5.20/Mouse/Meta/Role/Application.pm
/usr/lib/x86_64-linux-gnu/perl5/5.20/Mouse/Meta/Role/Method.pm
/usr/lib/x86_64-linux-gnu/perl5/5.20/Mouse/Meta/Role/Composite.pm
/usr/lib/x86_64-linux-gnu/perl5/5.20/Mouse/Meta/Method/
/usr/lib/x86_64-linux-gnu/perl5/5.20/Mouse/Meta/Method/Accessor.pm
/usr/lib/x86_64-linux-gnu/perl5/5.20/Mouse/Meta/Method/Delegation.pm
/usr/lib/x86_64-linux-gnu/perl5/5.20/Mouse/Meta/Method/Constructor.pm
/usr/lib/x86_64-linux-gnu/perl5/5.20/Mouse/Meta/Method/Destructor.pm