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:14:1
   |
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:18:1
   |
LL | #[must_use = "With note"]
   | ------------------------- help: remove the attribute
LL | pub fn must_use_with_note() {}
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: this unit-returning function has a `#[must_use]` attribute
  --> tests/ui/must_use_unit.rs:34:1
   |
LL | #[cfg_attr(all(), must_use, deprecated)]
   |                   -------------------- help: change these attributes to: `deprecated`
LL | fn issue_12320() {}
   | ^^^^^^^^^^^^^^^^

error: this unit-returning function has a `#[must_use]` attribute
  --> tests/ui/must_use_unit.rs:38:1
   |
LL | #[cfg_attr(all(), deprecated, doc = "foo", must_use)]
   |                   --------------------------------- help: change these attributes to: `deprecated, doc = "foo"`
LL | fn issue_12320_2() {}
   | ^^^^^^^^^^^^^^^^^^

error: aborting due to 5 previous errors