#!/usr/bin/env perl
use strict;
use warnings;
use Error::Pure;
use Mo::utils qw(check_code);
$Error::Pure::TYPE = 'Error';
my $self = {
        'key' => 'bad',
};
check_code($self, 'key');
# Print out.
print "ok\n";
# Output like:
# #Error [..utils.pm:?] Parameter 'key' must be a code.