New lint: [derive_partial_eq_without_eq]

clippy_lints/src/methods/mod.rs

@@ -2835,7 +2835,7 @@ const TRAIT_METHODS: [ShouldImplTraitCase; 30] = [
     ShouldImplTraitCase::new("std::ops::Sub", "sub",  2,  FN_HEADER,  SelfKind::Value,  OutType::Any, true),
 ];
 
-#[derive(Clone, Copy, PartialEq, Debug)]
+#[derive(Clone, Copy, PartialEq, Eq, Debug)]
 enum SelfKind {
     Value,
     Ref,

clippy_lints/src/methods/str_splitn.rs

@@ -271,7 +271,7 @@ enum IterUsageKind {
     NextTuple,
 }
 
-#[derive(Debug, PartialEq)]
+#[derive(Debug, PartialEq, Eq)]
 enum UnwrapKind {
     Unwrap,
     QuestionMark,