error: this function has an empty `#[must_use]` attribute, but returns a type already marked as `#[must_use]` --> $DIR/double_must_use.rs:4:1 | LL | pub fn must_use_result() -> Result<(), ()> { | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | = note: `-D clippy::double-must-use` implied by `-D warnings` = help: either add some descriptive text or remove the attribute error: this function has an empty `#[must_use]` attribute, but returns a type already marked as `#[must_use]` --> $DIR/double_must_use.rs:9:1 | LL | pub fn must_use_tuple() -> (Result<(), ()>, u8) { | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | = help: either add some descriptive text or remove the attribute error: this function has an empty `#[must_use]` attribute, but returns a type already marked as `#[must_use]` --> $DIR/double_must_use.rs:14:1 | LL | pub fn must_use_array() -> [Result<(), ()>; 1] { | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | = help: either add some descriptive text or remove the attribute error: aborting due to 3 previous errors