error: consider using `Option<T>` instead of `Option<Option<T>>` or a custom enum if you need to distinguish all 3 cases
 --> $DIR/option_option.rs:1:13
  |
1 | fn input(_: Option<Option<u8>>) {
  |             ^^^^^^^^^^^^^^^^^^
  |
  = note: `-D option-option` implied by `-D warnings`

error: consider using `Option<T>` instead of `Option<Option<T>>` or a custom enum if you need to distinguish all 3 cases
 --> $DIR/option_option.rs:4:16
  |
4 | fn output() -> Option<Option<u8>> {
  |                ^^^^^^^^^^^^^^^^^^

error: consider using `Option<T>` instead of `Option<Option<T>>` or a custom enum if you need to distinguish all 3 cases
 --> $DIR/option_option.rs:8:27
  |
8 | fn output_nested() -> Vec<Option<Option<u8>>> {
  |                           ^^^^^^^^^^^^^^^^^^

error: consider using `Option<T>` instead of `Option<Option<T>>` or a custom enum if you need to distinguish all 3 cases
  --> $DIR/option_option.rs:13:30
   |
13 | fn output_nested_nested() -> Option<Option<Option<u8>>> {
   |                              ^^^^^^^^^^^^^^^^^^^^^^^^^^

error: consider using `Option<T>` instead of `Option<Option<T>>` or a custom enum if you need to distinguish all 3 cases
  --> $DIR/option_option.rs:18:8
   |
18 |     x: Option<Option<u8>>,
   |        ^^^^^^^^^^^^^^^^^^

error: consider using `Option<T>` instead of `Option<Option<T>>` or a custom enum if you need to distinguish all 3 cases
  --> $DIR/option_option.rs:22:23
   |
22 |     fn struct_fn() -> Option<Option<u8>> {
   |                       ^^^^^^^^^^^^^^^^^^

error: consider using `Option<T>` instead of `Option<Option<T>>` or a custom enum if you need to distinguish all 3 cases
  --> $DIR/option_option.rs:28:22
   |
28 |     fn trait_fn() -> Option<Option<u8>>;
   |                      ^^^^^^^^^^^^^^^^^^

error: consider using `Option<T>` instead of `Option<Option<T>>` or a custom enum if you need to distinguish all 3 cases
  --> $DIR/option_option.rs:32:11
   |
32 |     Tuple(Option<Option<u8>>),
   |           ^^^^^^^^^^^^^^^^^^

error: consider using `Option<T>` instead of `Option<Option<T>>` or a custom enum if you need to distinguish all 3 cases
  --> $DIR/option_option.rs:33:15
   |
33 |     Struct{x: Option<Option<u8>>},
   |               ^^^^^^^^^^^^^^^^^^

error: aborting due to 9 previous errors