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