Auto tupling of function parameters for generic tuples

[nicolasstucki]

As a generalization of Tuple2[Int, Int], Int *: Int *: Unit should also allow autotupling.

val h2: Int *: Int *: Unit => Int = (x, y) => x + y

it currently fails with

4 |  val h2: Int *: Int *: Unit => Int = (x, y) => x + y
  |                                      ^^^^^^^^^^^^^^^
  |                                   wrong number of parameters, expected: 1