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