#!perl
use Test::More tests => 16;
use warnings FATAL => 'all';
use strict;
sub Burlap::fun (&) { $_[0]->() }
{
        use Function::Parameters;
        is fun { 2 + 2 }->(), 4;
        package Burlap;
        ::ok fun { 0 };
}
{
        package Burlap;
        ::is fun { 'singing' }, 'singing';
}
{
        sub proc (&) { &Burlap::fun }
        use Function::Parameters { proc => 'function' };
        proc add($x, $y) {
                return $x + $y;
        }
        is add(@{[2, 3]}), 5;
        {
                use Function::Parameters;
                is proc () { 'bla' }->(), 'bla';
                is method () { $self }->('der'), 'der';
                {
                        no Function::Parameters;
                        is proc { 'unk' }, 'unk';
                        is eval('fun foo($x) { $x; } 1'), undef;
                        like $@, qr/syntax error/;
                }
                is proc () { 'bla' }->(), 'bla';
                is method () { $self }->('der'), 'der';
                no Function::Parameters 'proc';
                is proc { 'unk2' }, 'unk2';
                is method () { $self }->('der2'), 'der2';
        }
        is proc () { 'bla3' }->(), 'bla3';
        is eval('fun foo($x) { $x; } 1'), undef;
        like $@, qr/syntax error/;
}