error: generic parameters may not be used in const operations --> $DIR/const-argument-non-static-lifetime.rs:14:17 | LL | let _: &'a (); | ^^ cannot perform const operation using `'a` | = note: lifetime parameters may not be used in const expressions = help: add `#![feature(generic_const_exprs)]` to allow generic const expressions error: aborting due to 1 previous error