error: lifetime bounds cannot be used in this context --> $DIR/bounds-lifetime.rs:1:22 | LL | type A = for<'b, 'a: 'b> fn(); | ^^ error: lifetime bounds cannot be used in this context --> $DIR/bounds-lifetime.rs:2:22 | LL | type B = for<'b, 'a: 'b,> fn(); | ^^ error: lifetime bounds cannot be used in this context --> $DIR/bounds-lifetime.rs:3:22 | LL | type C = for<'b, 'a: 'b +> fn(); | ^^ error[E0658]: only lifetime parameters can be used in this context --> $DIR/bounds-lifetime.rs:4:18 | LL | type D = for<'a, T> fn(); | ^ | = note: see issue #108185 for more information = help: add `#![feature(non_lifetime_binders)]` to the crate attributes to enable error[E0658]: only lifetime parameters can be used in this context --> $DIR/bounds-lifetime.rs:5:18 | LL | type E = dyn for Fn(); | ^ | = note: see issue #108185 for more information = help: add `#![feature(non_lifetime_binders)]` to the crate attributes to enable error: aborting due to 5 previous errors For more information about this error, try `rustc --explain E0658`.