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error: lifetime may not live long enough
--> $DIR/ex3-both-anon-regions-2.rs:1:14
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LL | fn foo(&mut (ref mut v, w): &mut (&u8, &u8), x: &u8) {
| ^^^^^^^^^ - - let's call the lifetime of this reference `'1`
| | |
| | let's call the lifetime of this reference `'2`
| assignment requires that `'1` must outlive `'2`
|
= note: requirement occurs because of a mutable reference to `&u8`
= note: mutable references are invariant over their type parameter
= help: see <https://doc.rust-lang.org/nomicon/subtyping.html> for more information about variance
help: consider introducing a named lifetime parameter
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LL | fn foo<'a>(&mut (ref mut v, w): &mut (&'a u8, &u8), x: &'a u8) {
| ++++ ++ ++
error: aborting due to 1 previous error
|
