| error: lifetime may not live long enough |
| --> $DIR/match-ref-mut-invariance.rs:10:9 |
| | |
| LL | impl<'b> S<'b> { |
| | -- lifetime `'b` defined here |
| LL | fn bar<'a>(&'a mut self) -> &'a mut &'a i32 { |
| | -- lifetime `'a` defined here |
| LL | match self.0 { ref mut x => x } |
| | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ method was supposed to return data with lifetime `'b` but it is returning data with lifetime `'a` |
| | |
| = help: consider adding the following bound: `'a: 'b` |
| = note: requirement occurs because of a mutable reference to `&i32` |
| = note: mutable references are invariant over their type parameter |
| = help: see <https://doc.rust-lang.org/nomicon/subtyping.html> for more information about variance |
| |
| error: aborting due to 1 previous error |
| |
