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error: lifetime may not live long enough
--> $DIR/ex3-both-anon-regions.rs:2:5
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LL | fn foo(x: &mut Vec<&u8>, y: &u8) {
| - - let's call the lifetime of this reference `'1`
| |
| let's call the lifetime of this reference `'2`
LL | x.push(y);
| ^^^^^^^^^ argument 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>(x: &mut Vec<&'a u8>, y: &'a u8) {
| ++++ ++ ++
error: aborting due to previous error
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