error[E0658]: only lifetime parameters can be used in this context --> $DIR/hrtb-wrong-kind.rs:1:18 | LL | fn a() where for T: Copy {} | ^ | = 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/hrtb-wrong-kind.rs:4:24 | LL | fn b() where for [(); C]: Copy {} | ^ | = note: see issue #108185 for more information = help: add `#![feature(non_lifetime_binders)]` to the crate attributes to enable error: aborting due to 2 previous errors For more information about this error, try `rustc --explain E0658`.