| A.CallExp {func; args; pos} ->
(match env_get_val ~sym:func ~env ~pos with
| Value.Fun {formals; result} ->
- List.iter2 formals args ~f:(fun ty_expected exp_given ->
- check_same (return (actual_ty ~pos ty_expected)) (trexp exp_given) ~pos;
- );
- return (actual_ty ~pos result)
+ let expected = List.length formals in
+ let given = List.length args in
+ if given = expected then
+ begin
+ List.iter2 formals args ~f:(fun ty_expected exp_given ->
+ check_same
+ (return (actual_ty ~pos ty_expected))
+ (trexp exp_given)
+ ~pos;
+ );
+ return (actual_ty ~pos result)
+ end
+ else
+ E.raise (E.Wrong_number_of_args {func; expected; given; pos})
| Value.Var _ ->
E.raise (E.Id_not_a_function {id=func; pos})
)