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error: lifetime may not live long enough
--> $DIR/ex3-both-anon-regions-2.rs:2:5
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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`
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| let's call the lifetime of this reference `'2`
LL | *v = x;
| ^^^^^^ assignment requires that `'1` must outlive `'2`
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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 previous error
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