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my ($self) = @_;
croak "..." unless ref($self) && $self->isa("AnInterface")
use base qw(AnInterface AnotherInterface YetAnotherInterface);
my $self = shift;
... code ...
sub foo # requires interfaces InterfaceA, InterfaceB
Once (shame on you!)
Twice (shame on me!)
More often than I'd like to be
All the time
Just when answering stupid polls
Who you callin' a fool?
I refuse to vote in this ridiculous poll
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