// run-rustfix #[warn(clippy::cmp_owned)] #[allow(clippy::unnecessary_operation, clippy::no_effect, unused_must_use, clippy::eq_op)] fn main() { fn with_to_string(x: &str) { x != "foo".to_string(); "foo".to_string() != x; } let x = "oh"; with_to_string(x); x != "foo".to_owned(); x != String::from("foo"); 42.to_string() == "42"; Foo.to_owned() == Foo; "abc".chars().filter(|c| c.to_owned() != 'X'); "abc".chars().filter(|c| *c != 'X'); } struct Foo; impl PartialEq for Foo { // Allow this here, because it emits the lint // without a suggestion. This is tested in // `tests/ui/cmp_owned/without_suggestion.rs` #[allow(clippy::cmp_owned)] fn eq(&self, other: &Self) -> bool { self.to_owned() == *other } } impl ToOwned for Foo { type Owned = Bar; fn to_owned(&self) -> Bar { Bar } } #[derive(PartialEq)] struct Bar; impl PartialEq<Foo> for Bar { fn eq(&self, _: &Foo) -> bool { true } } impl std::borrow::Borrow<Foo> for Bar { fn borrow(&self) -> &Foo { static FOO: Foo = Foo; &FOO } } #[derive(PartialEq)] struct Baz; impl ToOwned for Baz { type Owned = Baz; fn to_owned(&self) -> Baz { Baz } }