tests/ui/issues/issue-54302.rs

   1 trait Deserialize<'de> {}
   2
   3 trait DeserializeOwned: for<'de> Deserialize<'de> {}
   4 impl<T> DeserializeOwned for T where T: for<'de> Deserialize<'de> {}
   5
   6 // Based on this impl, `&'static str` only implements Deserialize<'static>.
   7 // It does not implement for<'de> Deserialize<'de>.
   8 impl<'de: 'a, 'a> Deserialize<'de> for &'a str {}
   9
  10 fn main() {
  11     // Then why does it implement DeserializeOwned? This compiles.
  12     fn assert_deserialize_owned<T: DeserializeOwned>() {}
  13     assert_deserialize_owned::<&'static str>();
  14     //~^ ERROR not general enough
  15
  16     // It correctly does not implement for<'de> Deserialize<'de>.
  17     //fn assert_hrtb<T: for<'de> Deserialize<'de>>() {}
  18     //assert_hrtb::<&'static str>();
  19 }