sub foo (
             $pos1,  # positional parameter; consumes 1 arg
             $pos2,  # positional parameter; consumes 1 arg
            :$name1, # named parameter, consumes ("name1", value) arg pair
            :$name2, # named parameter, consumes ("name2", value) arg pair
            @rest, # consumes all unrecognised name/value pairs
        ) { ... }