freebsd-ports/devel/p5-Sub-Multi/pkg-descr

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Perl6 allows multiple subs and methods with the same name, differing only in
their signature.
multi sub bar (Dog $foo) {?}
multi sub bar (Cat $foo) {?}
Dispatching will happen based on the runtime signature of the subroutine or
method call.
WWW: http://search.cpan.org/dist/Sub-Multi/