rust-clippy/tests/ui/option_option.stderr

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:4:13
   |
LL | fn input(_: Option<Option<u8>>) {}
   |             ^^^^^^^^^^^^^^^^^^
   |
note: the lint level is defined here
  --> $DIR/option_option.rs:1:9
   |
LL | #![deny(clippy::option_option)]
   |         ^^^^^^^^^^^^^^^^^^^^^

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:6:16
   |
LL | 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:10:27
   |
LL | 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:15:30
   |
LL | 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:20:8
   |
LL |     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:24:23
   |
LL |     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:30:22
   |
LL |     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:34:11
   |
LL |     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:35:17
   |
LL |     Struct { 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:76:14
   |
LL |         foo: Option<Option<Cow<'a, str>>>,
   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: aborting due to 10 previous errors