(* This example must be REJECTED because of "if z then...",
   whereas z is of type int *)

node h(z: int; x, y: int) returns (o2: int)
  var o1, o: int;
  let
    (o1, o2) = if z then (1, 2) else (3, 4);
    o = 0 -> pre o + 2
  tel

