error[E0637]: `&` without an explicit lifetime name cannot be used here --> $DIR/elided-lifetimes.rs:8:5 | LL | &T: Copy; | ^ explicit lifetime name needed here | help: consider introducing a higher-ranked lifetime here | LL | for<'a> &'a T: Copy; | +++++++ ++ error[E0637]: `&` without an explicit lifetime name cannot be used here --> $DIR/elided-lifetimes.rs:10:18 | LL | const I: &str = ""; | ^ explicit lifetime name needed here error[E0637]: `'_` cannot be used here --> $DIR/elided-lifetimes.rs:14:18 | LL | const B>: () = (); | ^^ `'_` is a reserved lifetime name error: `&str` is forbidden as the type of a const generic parameter --> $DIR/elided-lifetimes.rs:10:18 | LL | const I: &str = ""; | ^^^^ | = note: the only supported types are integers, `bool` and `char` help: add `#![feature(adt_const_params)]` to the crate attributes to enable more complex and user defined types | LL + #![feature(adt_const_params)] | error: aborting due to 4 previous errors For more information about this error, try `rustc --explain E0637`.