Line 6, characters 9-10:
6 |   | 3 as 3 -> ()
             ^
Error: Syntax error: identifier expected.
Line 3, characters 9-11:
3 |   | 3 :: -> ()
             ^^
Error: Syntax error: pattern expected.
Line 3, characters 8-10:
3 |   | 3 | -> ()
            ^^
Error: Syntax error: pattern expected.
Line 3, characters 11-13:
3 |   | List.( -> ()
               ^^
Error: Syntax error: pattern expected.
Line 3, characters 9-10:
3 |   | (3 : 3) -> ()
             ^
Error: Syntax error: type expected.
Line 3, characters 7-8:
3 |   | (3,) -> ()
           ^
Error: Syntax error: pattern expected.
Line 3, characters 6-8:
3 |   | ( -> ()
          ^^
Error: Syntax error: operator expected.
Line 3, characters 12-14:
3 |   | (module -> ()
                ^^
Error: Syntax error: module-expr expected.