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https://github.com/rust-lang/rust
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28 lines
604 B
Rust
28 lines
604 B
Rust
// Tests that we don't allow unconstrained lifetime parameters in impls when
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// the lifetime is used in an associated opaque type.
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#![feature(impl_trait_in_assoc_type)]
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trait UnwrapItemsExt {
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type Iter;
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fn unwrap_items(self) -> Self::Iter;
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}
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struct MyStruct {}
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trait MyTrait<'a> {}
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impl<'a> MyTrait<'a> for MyStruct {}
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impl<'a, I> UnwrapItemsExt for I {
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//~^ ERROR the lifetime parameter `'a` is not constrained
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type Iter = impl MyTrait<'a>;
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fn unwrap_items(self) -> Self::Iter {
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MyStruct {}
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//~^ ERROR expected generic lifetime parameter
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}
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}
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fn main() {}
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