2019-01-27 11:03:21 +00:00
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error: lifetime may not live long enough
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--> $DIR/match-ref-mut-invariance.rs:10:9
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LL | impl<'b> S<'b> {
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| -- lifetime `'b` defined here
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LL | fn bar<'a>(&'a mut self) -> &'a mut &'a i32 {
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| -- lifetime `'a` defined here
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LL | match self.0 { ref mut x => x }
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2021-12-31 21:55:34 +00:00
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ associated function was supposed to return data with lifetime `'b` but it is returning data with lifetime `'a`
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2019-10-27 14:39:14 +00:00
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= help: consider adding the following bound: `'a: 'b`
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2021-05-13 13:30:14 +00:00
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= note: requirement occurs because of a mutable reference to &i32
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= note: mutable references are invariant over their type parameter
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= help: see <https://doc.rust-lang.org/nomicon/subtyping.html> for more information about variance
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2019-01-27 11:03:21 +00:00
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error: aborting due to previous error
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