error: this returns a `Result<_, ()>`
  --> tests/ui/result_unit_error.rs:3:1
   |
LL | pub fn returns_unit_error() -> Result<u32, ()> {
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: use a custom `Error` type instead
   = note: `-D clippy::result-unit-err` implied by `-D warnings`
   = help: to override `-D warnings` add `#[allow(clippy::result_unit_err)]`

error: this returns a `Result<_, ()>`
  --> tests/ui/result_unit_error.rs:13:5
   |
LL |     fn get_that_error(&self) -> Result<bool, ()>;
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: use a custom `Error` type instead

error: this returns a `Result<_, ()>`
  --> tests/ui/result_unit_error.rs:16:5
   |
LL |     fn get_this_one_too(&self) -> Result<bool, ()> {
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: use a custom `Error` type instead

error: this returns a `Result<_, ()>`
  --> tests/ui/result_unit_error.rs:35:5
   |
LL |     pub fn unit_error(&self) -> Result<usize, ()> {
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: use a custom `Error` type instead

error: this returns a `Result<_, ()>`
  --> tests/ui/result_unit_error.rs:45:5
   |
LL |     pub fn should_lint() -> ResInv<(), usize> {
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: use a custom `Error` type instead

error: aborting due to 5 previous errors