=begin pod

=TITLE class Sub

=SUBTITLE Subroutine

    class Sub is Routine { }

A type for subroutines. Subs are created with the C<sub> keyword

    my $s = sub ($a, $b) { $a + $b };
    say $s.WHAT;        # Sub()
    say $s(2, 5);       # 7

=end pod
