error: generic parameters may not be used in const operations
  --> $DIR/issue-74713.rs:4:17
   |
LL |         let _: &'a ();
   |                 ^^ cannot perform const operation using `'a`
   |
   = note: lifetime parameters may not be used in const expressions
   = help: use `#![feature(generic_const_exprs)]` to allow generic const expressions

error[E0308]: mismatched types
  --> $DIR/issue-74713.rs:3:10
   |
LL |       [(); {
   |  __________^
LL | |         let _: &'a ();
LL | |     }]:
   | |_____^ expected `usize`, found `()`

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0308`.