src/test/ui/rfc1445/cant-hide-behind-direct-struct-embedded.rs

   1 // This is part of a set of tests exploring the different ways a
   2 // structural-match ADT might try to hold a
   3 // non-structural-match in hidden manner that lets matches
   4 // through that we had intended to reject.
   5 //
   6 // See discussion on rust-lang/rust#62307 and rust-lang/rust#62339
   7
   8 struct NoDerive(i32);
   9
  10 // This impl makes NoDerive irreflexive.
  11 impl PartialEq for NoDerive { fn eq(&self, _: &Self) -> bool { false } }
  12
  13 impl Eq for NoDerive { }
  14
  15 #[derive(PartialEq, Eq)]
  16 struct WrapInline(NoDerive);
  17
  18 const WRAP_DIRECT_INLINE: WrapInline = WrapInline(NoDerive(0));
  19
  20 fn main() {
  21     match WRAP_DIRECT_INLINE {
  22         WRAP_DIRECT_INLINE => { panic!("WRAP_DIRECT_INLINE matched itself"); }
  23         //~^ ERROR must be annotated with `#[derive(PartialEq, Eq)]`
  24         //~| ERROR must be annotated with `#[derive(PartialEq, Eq)]`
  25         _ => { println!("WRAP_DIRECT_INLINE did not match itself"); }
  26     }
  27 }