Tests will fail in perl-5.38.0

[jkeenan]

The given and when operators will be deprecated in soon-to-be-released perl-5.38.0. Code that uses them will emit warnings -- and that's already started to happen in Perl's monthly development releases. This CPAN distribution's test suite tests for the presence of warnings, failing in situations where warnings are detected. See, for example:

http://fast-matrix.cpantesters.org/?dist=ZMQ-FFI

http://www.cpantesters.org/cpan/report/9fedaa94-e36f-11ed-b277-6ccd62415523

Perl/perl5#21027

You may wish to consider adjustments in your code and/or tests.