src/test/ui/match/match-ref-mut-invariance.nll.stderr

   1 error: unsatisfied lifetime constraints
   2   --> $DIR/match-ref-mut-invariance.rs:20:9
   3    |
   4 LL | impl<'b> S<'b> {
   5    |      -- lifetime `'b` defined here
   6 LL |     fn bar<'a>(&'a mut self) -> &'a mut &'a i32 {
   7    |            -- lifetime `'a` defined here
   8 LL |         match self.0 { ref mut x => x } //~ ERROR mismatched types
   9    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ returning this value requires that `'a` must outlive `'b`
  10
  11 error: aborting due to previous error
  12