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https://github.com/rust-lang/rust
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29 lines
618 B
Rust
29 lines
618 B
Rust
#![allow(dead_code)]
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// Test that even when `T` is only used in contravariant position, it
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// is treated as invariant.
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trait Get<T> {
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fn get(&self, t: T);
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}
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fn get_min_from_max<'min, 'max, G>()
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where 'max : 'min, G : Get<&'max i32>
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{
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impls_get::<G,&'min i32>()
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//~^ ERROR lifetime may not live long enough
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}
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fn get_max_from_min<'min, 'max, G>()
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where 'max : 'min, G : Get<&'min i32>
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{
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// Previously OK, but now an error because traits are invariant:
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impls_get::<G,&'max i32>()
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//~^ ERROR lifetime may not live long enough
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}
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fn impls_get<G,T>() where G : Get<T> { }
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fn main() { }
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