gistfile1.txt

sub trait_mod:<is>(&c, :$curried!) {
    my $arity = &c.arity;
    &c.wrap(-> |args {
        args.list.elems == $arity
            ?? callsame()
            !! &c.assuming(|args)
    });
}

sub foo($a, $b) is curried {
    say $a + $b;
}

foo(3, 4);
my $c = foo(5);
$c(6);