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

   1 #[allow(clippy::unnecessary_operation)]
   2 #[allow(clippy::implicit_clone)]
   3
   4 fn main() {
   5     let x = &Baz;
   6     let y = &Baz;
   7     y.to_owned() == *x;
   8     //~^ ERROR: this creates an owned instance just for comparison
   9     //~| NOTE: `-D clippy::cmp-owned` implied by `-D warnings`
  10
  11     let x = &&Baz;
  12     let y = &Baz;
  13     y.to_owned() == **x;
  14     //~^ ERROR: this creates an owned instance just for comparison
  15
  16     let x = 0u32;
  17     let y = U32Wrapper(x);
  18     let _ = U32Wrapper::from(x) == y;
  19 }
  20
  21 struct Foo;
  22
  23 impl PartialEq for Foo {
  24     fn eq(&self, other: &Self) -> bool {
  25         self.to_owned() == *other
  26         //~^ ERROR: this creates an owned instance just for comparison
  27     }
  28 }
  29
  30 impl ToOwned for Foo {
  31     type Owned = Bar;
  32     fn to_owned(&self) -> Bar {
  33         Bar
  34     }
  35 }
  36
  37 #[derive(PartialEq, Eq)]
  38 struct Baz;
  39
  40 impl ToOwned for Baz {
  41     type Owned = Baz;
  42     fn to_owned(&self) -> Baz {
  43         Baz
  44     }
  45 }
  46
  47 #[derive(PartialEq, Eq)]
  48 struct Bar;
  49
  50 impl PartialEq<Foo> for Bar {
  51     fn eq(&self, _: &Foo) -> bool {
  52         true
  53     }
  54 }
  55
  56 impl std::borrow::Borrow<Foo> for Bar {
  57     fn borrow(&self) -> &Foo {
  58         static FOO: Foo = Foo;
  59         &FOO
  60     }
  61 }
  62
  63 #[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
  64 struct U32Wrapper(u32);
  65 impl From<u32> for U32Wrapper {
  66     fn from(x: u32) -> Self {
  67         Self(x)
  68     }
  69 }
  70 impl PartialEq<u32> for U32Wrapper {
  71     fn eq(&self, other: &u32) -> bool {
  72         self.0 == *other
  73     }
  74 }
  75 impl PartialEq<U32Wrapper> for u32 {
  76     fn eq(&self, other: &U32Wrapper) -> bool {
  77         *self == other.0
  78     }
  79 }