mirror of https://github.com/rust-lang/rust
25 lines
511 B
Rust
25 lines
511 B
Rust
#![feature(impl_trait_in_assoc_type)]
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// See https://github.com/rust-lang/rust/issues/87258#issuecomment-883293367
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trait Trait1 {}
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struct Struct<'b>(&'b ());
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impl<'d> Trait1 for Struct<'d> {}
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pub trait Trait2 {
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type FooFuture<'a>: Trait1;
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fn foo<'a>() -> Self::FooFuture<'a>;
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}
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impl<'c, S: Trait2> Trait2 for &'c mut S {
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type FooFuture<'a> = impl Trait1;
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//~^ ERROR unconstrained opaque type
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fn foo<'a>() -> Self::FooFuture<'a> {
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Struct(unimplemented!())
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}
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}
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fn main() {}
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