# type binary_tree =
    | Leaf of int
    | Tree of binary_tree * binary_tree;;
type binary_tree = Leaf of int | Tree of binary_tree * binary_tree
# type BinTree =
   |BinLeaf of int
  | BinNode of BinTree * BinTree;;
Error: Syntax error
# type BinTree = BinLeaf of int | BinNode of BinTree * BinTree
  ;;
Error: Syntax error