error[E0658]: only lifetime parameters can be used in this context --> $DIR/disallow-const.rs:4:15 | LL | for || -> () {}; | ^ | = note: see issue #108185 for more information = help: add `#![feature(non_lifetime_binders)]` to the crate attributes to enable error: aborting due to previous error For more information about this error, try `rustc --explain E0658`.