src/tools/clippy/tests/ui/cmp_owned.rs

   1
   2
   3
   4 #[warn(cmp_owned)]
   5 #[allow(unnecessary_operation)]
   6 fn main() {
   7     fn with_to_string(x : &str) {
   8         x != "foo".to_string();
   9
  10         "foo".to_string() != x;
  11     }
  12
  13     let x = "oh";
  14
  15     with_to_string(x);
  16
  17     x != "foo".to_owned();
  18
  19     x != String::from("foo");
  20
  21     42.to_string() == "42";
  22
  23     Foo.to_owned() == Foo;
  24 }
  25
  26 struct Foo;
  27
  28 impl PartialEq for Foo {
  29     fn eq(&self, other: &Self) -> bool {
  30         self.to_owned() == *other
  31     }
  32 }
  33
  34 impl ToOwned for Foo {
  35     type Owned = Bar;
  36     fn to_owned(&self) -> Bar {
  37         Bar
  38     }
  39 }
  40
  41 #[derive(PartialEq)]
  42 struct Bar;
  43
  44 impl PartialEq<Foo> for Bar {
  45     fn eq(&self, _: &Foo) -> bool {
  46         true
  47     }
  48 }
  49
  50 impl std::borrow::Borrow<Foo> for Bar {
  51     fn borrow(&self) -> &Foo {
  52         static FOO: Foo = Foo;
  53         &FOO
  54     }
  55 }