src/test/ui/regions/issue-28848.stderr

   1 error: lifetime may not live long enough
   2   --> $DIR/issue-28848.rs:10:5
   3    |
   4 LL | pub fn foo<'a, 'b>(u: &'b ()) -> &'a () {
   5    |            --  -- lifetime `'b` defined here
   6    |            |
   7    |            lifetime `'a` defined here
   8 LL |     Foo::<'a, 'b>::xmute(u)
   9    |     ^^^^^^^^^^^^^^^^^^^^ requires that `'b` must outlive `'a`
  10    |
  11    = help: consider adding the following bound: `'b: 'a`
  12
  13 error: aborting due to previous error
  14