Line 5, characters 16-22:
5 | module type S = struct end
                    ^^^^^^
Error: Syntax error: sig expected.
Line 3, characters 18-24:
3 |   module type S = struct end
                      ^^^^^^
Error: Syntax error: sig expected.
Line 3, characters 13-19:
3 |   module M : struct end
                 ^^^^^^
Error: Syntax error: sig expected.
Line 3, characters 11-12:
3 |   module M = struct end
               ^
Error: Syntax error: : expected.
Line 3, characters 0-2:
3 | ;;
    ^^
Error: Syntax error
Line 2, characters 11-17:
2 | module M : struct end
               ^^^^^^
Error: Syntax error: sig expected.
Line 3, characters 32-38:
3 |   module M : functor (X : S) -> struct end
                                    ^^^^^^
Error: Syntax error: sig expected.
Line 2, characters 15-18:
2 | module M = X.Y(sig end)
                   ^^^
Error: Syntax error: struct expected.
Line 3, characters 25-28:
3 |   include module type of sig end
                             ^^^
Error: Syntax error: struct expected.