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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
Electric eels were invented at the same time as electricity
Before electricity was invented, electric eels had to stun with gas
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