> type bT =
    | Node of bT * int * bT
    | Empty;;

type bT =
  | Node of bT * int * bT
  | Empty

> Node(
    Node(Empty,2,Empty),1,Empty));;

      Node(Empty,2,Empty),1,Empty));;
  --------------------------------^

stdin(5,33): error FS0010: Unexpected symbol ')' in interaction. Expected incomplete structured construct at or before this point, ';', ';;' or other token.
>