use strict;
use warnings;
use Test::Fatal;
use Test::More 0.96;
use Specio::Library::Builtins;
is(
    exception { Specio::Library::Builtins->import },
    undef,
    'no exception importing the same library twice'
);
isa_ok( t('Num'), 'Specio::Constraint::Simple' );
done_testing();