error[E0597]: `v` does not live long enough
  --> $DIR/borrowed-universal-error-2.rs:18:5
   |
LL |     &v
   |     ^^ borrowed value does not live long enough
LL |     //~^ ERROR `v` does not live long enough [E0597]
LL | }
   | - borrowed value only lives until here
   |
note: borrowed value must be valid for the lifetime 'a as defined on the function body at 16:1...
  --> $DIR/borrowed-universal-error-2.rs:16:1
   |
LL | fn foo<'a>(x: &'a (u32,)) -> &'a u32 {
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: aborting due to previous error

If you want more information on this error, try using "rustc --explain E0597"