The code in the parent post is neither inheritable nor importable. Fix: 

use List::Util qw( first );

sub check {
   my ($self, $method) = @_;
   my $class = ref($self) || $self;
   my $isa = do { no strict 'refs'; \@{$class.'::ISA'} };
   return first { $_->can($method) } @$isa;
}

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In reply to Re^2: Detecting Overridden Methods by ikegami
in thread Detecting Overridden Methods by Ovid

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