error: missing `#[must_use]` attribute on a method returning `Self`
  --> $DIR/return_self_not_must_use.rs:8:5
   |
LL |     fn what(&self) -> Self;
   |     ^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: consider adding the `#[must_use]` attribute to the method or directly to the `Self` type
   = note: `-D clippy::return-self-not-must-use` implied by `-D warnings`

error: missing `#[must_use]` attribute on a method returning `Self`
  --> $DIR/return_self_not_must_use.rs:18:5
   |
LL | /     pub fn foo(&self) -> Self {
LL | |         Self
LL | |     }
   | |_____^
   |
   = help: consider adding the `#[must_use]` attribute to the method or directly to the `Self` type

error: missing `#[must_use]` attribute on a method returning `Self`
  --> $DIR/return_self_not_must_use.rs:21:5
   |
LL | /     pub fn bar(self) -> Self {
LL | |         self
LL | |     }
   | |_____^
   |
   = help: consider adding the `#[must_use]` attribute to the method or directly to the `Self` type

error: aborting due to 3 previous errors