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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
An electronic device
Being the designated driver
Spending time with a celebrity
I never won anything
I never play the lottery
I haven't checked my spam folder recently
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