[Bug 214617] mail/p5-Mail-Alias: library no longer works on perl5.24

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=214617

Matthew Seaman <matthew at FreeBSD.org> changed:

           What    |Removed                     |Added
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                 CC|                            |matthew at FreeBSD.org

--- Comment #2 from Matthew Seaman <matthew at FreeBSD.org> ---
(In reply to takeda from comment #0)

Your suggested change isn't quite right.  There are precedence problems. 
You're testing if $pkg is defined, and then appending the string "::ISA" to the
result of that -- which gives a result which always evaluates to true. 

Something like this would be better:

 croak "Unknown format '$fmt'"
  unless @{$pkg . "::ISA"};

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