error: this unit-returning function has a `#[must_use]` attribute
  --> tests/ui/must_use_unit.rs:10:1
   |
LL | #[must_use]
   | ----------- help: remove the attribute
LL | pub fn must_use_default() {}
   | ^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: `-D clippy::must-use-unit` implied by `-D warnings`
   = help: to override `-D warnings` add `#[allow(clippy::must_use_unit)]`

error: this unit-returning function has a `#[must_use]` attribute
  --> tests/ui/must_use_unit.rs:13:1
   |
LL | #[must_use]
   | ----------- help: remove the attribute
LL | pub fn must_use_unit() -> () {}
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: this unit-returning function has a `#[must_use]` attribute
  --> tests/ui/must_use_unit.rs:16:1
   |
LL | #[must_use = "With note"]
   | ------------------------- help: remove the attribute
LL | pub fn must_use_with_note() {}
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: aborting due to 3 previous errors