rust/src/test/ui/regions/region-invariant-static-error-reporting.nll.stderr

error[E0521]: borrowed data escapes outside of function
  --> $DIR/region-invariant-static-error-reporting.rs:15:9
   |
LL | fn unify<'a>(x: Option<Invariant<'a>>, f: fn(Invariant<'a>)) {
   |          --  - `x` is a reference that is only valid in the function body
   |          |
   |          lifetime `'a` defined here
LL |     let bad = if x.is_some() {
LL |         x.unwrap()
   |         ^^^^^^^^^^
   |         |
   |         `x` escapes the function body here
   |         argument requires that `'a` must outlive `'static`

error: aborting due to previous error

For more information about this error, try `rustc --explain E0521`.