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error: lifetime may not live long enough
--> $DIR/match-ref-mut-invariance.rs:10:9
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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`
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= 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 previous error
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