use v6-alpha;

use Test;

=pod

This tests the &?ROUTINE magical value

L<S06/"The C<&?ROUTINE> object">

=cut

plan 4;

# L<S06/"The C<&?ROUTINE> object">
# L<S02/"Names" /Which sub am I in/>
sub factorial { @_[0] < 2 ?? 1 !! @_[0] * &?ROUTINE(@_[0] - 1) }

my $result1 = factorial(3);
is($result1, 6, 'the &?ROUTINE magical works correctly');

my $factorial = sub { @_[0] < 2 ?? 1 !! @_[0] * &?ROUTINE(@_[0] - 1) };
my $result2 = $factorial(3);
is($result2, 6, 'the &?ROUTINE magical works correctly in anon-subs');

sub postfix:<!> (Int $n) { $n < 2 ?? 1 !! $n * &?ROUTINE($n - 1) }
my $result3 = 3!;
is($result3, 6, 'the &?ROUTINE magical works correctly in overloaded operators' );

my $baz = try { &?ROUTINE };
ok(!defined($baz), '&?ROUTINE not defined outside of a sub');