1 // Copyright 2018 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 trait Deserialize<'de> {}
13 trait DeserializeOwned: for<'de> Deserialize<'de> {}
14 impl<T> DeserializeOwned for T where T: for<'de> Deserialize<'de> {}
16 // Based on this impl, `&'static str` only implements Deserialize<'static>.
17 // It does not implement for<'de> Deserialize<'de>.
18 impl<'de: 'a, 'a> Deserialize<'de> for &'a str {}
21 // Then why does it implement DeserializeOwned? This compiles.
22 fn assert_deserialize_owned<T: DeserializeOwned>() {}
23 assert_deserialize_owned::<&'static str>();
24 //~^ ERROR the requirement `for<'de> 'de : ` is not satisfied
26 // It correctly does not implement for<'de> Deserialize<'de>.
27 //fn assert_hrtb<T: for<'de> Deserialize<'de>>() {}
28 //assert_hrtb::<&'static str>();