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