25 lines
877 B
Rust
25 lines
877 B
Rust
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// Regression test for #54302.
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//
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// We were incorrectly using the "evaluation cache" (which ignored
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// region results) to conclude that `&'static str: Deserialize`, even
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// though it would require that `for<'de> 'de: 'static`, which is
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// clearly false.
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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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fn assert_deserialize_owned<T: DeserializeOwned>() {}
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assert_deserialize_owned::<&'static str>(); //~ ERROR
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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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