error: re-implementing `PartialEq::ne` is unnecessary
  --> tests/ui/partialeq_ne_impl.rs:9:5
   |
LL |     fn ne(&self, _: &Foo) -> bool {
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: `-D clippy::partialeq-ne-impl` implied by `-D warnings`
   = help: to override `-D warnings` add `#[allow(clippy::partialeq_ne_impl)]`

error: aborting due to 1 previous error