error[E0491]: in type `&'a &'b ()`, reference has a longer lifetime than the data it references
  --> $DIR/reference-outlives-referent.rs:7:18
   |
LL | const Q<'a, 'b>: &'a &'b () = &&();
   |                  ^^^^^^^^^^
   |
note: the pointer is valid for the lifetime `'a` as defined here
  --> $DIR/reference-outlives-referent.rs:7:9
   |
LL | const Q<'a, 'b>: &'a &'b () = &&();
   |         ^^
note: but the referenced data is only valid for the lifetime `'b` as defined here
  --> $DIR/reference-outlives-referent.rs:7:13
   |
LL | const Q<'a, 'b>: &'a &'b () = &&();
   |             ^^

error: aborting due to previous error

For more information about this error, try `rustc --explain E0491`.