[MacPorts] #50512: perl5: obsolete subports perl5.16 perl5.18 perl5.20

[MacPorts]

#50512: perl5: obsolete subports perl5.16 perl5.18 perl5.20
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  Reporter:  devans@…     |      Owner:  mojca@…
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  perl5        |
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Comment (by devans@…):

 A slightly more permissive approach would be to follow
 [http://perldoc.perl.org/perlpolicy.html#MAINTENANCE-AND-SUPPORT the perl
 developers policy] and obsolete all perl versions that are not supported
 upstream.  As of the release of perl 5.22, perl5.18 and earlier became
 unsupported.  Upon the release of perl5.24 support for perl5.20 will cease
 and so on.

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Ticket URL: <https://trac.macports.org/ticket/50512#comment:3>
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