experimental warning for given/~~ before 5.20.0

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Migrated from rt.perl.org#116913 (status was 'resolved')

Searchable as RT116913$

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From @rjbs

The behavior of given/when/~~ are likely to change in perl 5.20.0​: either smart
match will be removed or stripped down. In light of this, users of these
features should be warned. A category "experimental​::smartmatch" warning
should be issued for these features when they are used.

--
rjbs

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From @Hugmeir

On Sun Feb 24 19​:20​:57 2013, rjbs wrote​:

The behavior of given/when/~~ are likely to change in perl 5.20.0​:
either smart
match will be removed or stripped down. In light of this, users of
these
features should be warned. A category "experimental​::smartmatch"
warning
should be issued for these features when they are used.

https://github.com/Hugmeir/utf8mess/tree/experimental_given_when_smartmatch

The branch introduces three new warnings​:

given is experimental
when is experimental
Smartmatch is experimental

The three are under the experimental​::smartmatch category. There's a
handful of commits that remove uses of smartmatch throughout the core,
and then a big one that introduces the three warnings & disables them in
the tests.

The last commit are changes to autodie to silence the warning, but that
has upstream => cpan, so it shouldn't be merged.

--
--hugmeir

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The RT System itself - Status changed from 'new' to 'open'

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From @khwilliamson

Thanks, applied as commits starting with
44bda13
--
Karl Williamson

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@khwilliamson - Status changed from 'open' to 'resolved'