56 lines
1.2 KiB
Rust
56 lines
1.2 KiB
Rust
// compile-flags:-Zverbose
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// Tests closures that propagate an outlives relationship to their
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// creator where the subject is a projection with no regions (`<T as
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// Iterator>::Item`, to be exact).
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#![allow(warnings)]
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#![feature(rustc_attrs)]
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trait Anything { }
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impl<T> Anything for T { }
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fn with_signature<'a, T, F>(x: Box<T>, op: F) -> Box<dyn Anything + 'a>
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where F: FnOnce(Box<T>) -> Box<dyn Anything + 'a>
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{
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op(x)
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}
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#[rustc_regions]
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fn no_region<'a, T>(x: Box<T>) -> Box<dyn Anything + 'a>
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where
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T: Iterator,
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{
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with_signature(x, |mut y| Box::new(y.next()))
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//~^ ERROR the associated type `<T as Iterator>::Item` may not live long enough
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}
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#[rustc_regions]
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fn correct_region<'a, T>(x: Box<T>) -> Box<dyn Anything + 'a>
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where
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T: 'a + Iterator,
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{
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with_signature(x, |mut y| Box::new(y.next()))
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}
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#[rustc_regions]
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fn wrong_region<'a, 'b, T>(x: Box<T>) -> Box<dyn Anything + 'a>
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where
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T: 'b + Iterator,
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{
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with_signature(x, |mut y| Box::new(y.next()))
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//~^ ERROR the associated type `<T as Iterator>::Item` may not live long enough
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}
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#[rustc_regions]
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fn outlives_region<'a, 'b, T>(x: Box<T>) -> Box<dyn Anything + 'a>
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where
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T: 'b + Iterator,
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'b: 'a,
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{
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with_signature(x, |mut y| Box::new(y.next()))
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}
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fn main() {}
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