fix clippy::derive_partial_eq_without_eq

Author: hellow554

src/minmax.rs

@@ -1,7 +1,7 @@
 /// `MinMaxResult` is an enum returned by `minmax`.
 ///
 /// See [`.minmax()`](crate::Itertools::minmax) for more detail.
-#[derive(Copy, Clone, PartialEq, Debug)]
+#[derive(Copy, Clone, PartialEq, Eq, Debug)]
 pub enum MinMaxResult<T> {
     /// Empty iterator
     NoElements,

tests/test_core.rs

@@ -228,7 +228,7 @@ fn count_clones() {
     // Check that RepeatN only clones N - 1 times.
 
     use core::cell::Cell;
-    #[derive(PartialEq, Debug)]
+    #[derive(PartialEq, Eq, Debug)]
     struct Foo {
         n: Cell<usize>,
     }