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error: lifetime may not live long enough
--> $DIR/ex3-both-anon-regions-one-is-struct-3.rs:4:5
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LL | fn foo(mut y: Ref, x: &u32) {
| ----- - let's call the lifetime of this reference `'1`
| |
| has type `Ref<'_, '2>`
LL | y.b = 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 y: Ref<'a, 'a>, x: &'a u32) {
| ++++ ++++++++ ++
error: aborting due to 1 previous error
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