1error[E0700]: hidden type for `impl Trait` captures lifetime that does not appear in bounds 2 --> $DIR/issue-87258_b.rs:21:21 3 | 4LL | fn foo<'a>() -> Self::FooFuture<'a> { 5 | ^^^^^^^^^^^^^^^^^^^ 6 | 7 = note: hidden type `Struct<'_>` captures lifetime '_#7r 8 9error: aborting due to previous error 10 11For more information about this error, try `rustc --explain E0700`. 12