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error: lifetime may not live long enough
--> $DIR/ex2b-push-no-existing-names.rs:6:5
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LL | fn foo(x: &mut Vec<Ref<i32>>, y: Ref<i32>) {
| - - has type `Ref<'1, i32>`
| |
| has type `&mut Vec<Ref<'2, i32>>`
LL | x.push(y);
| ^^^^^^^^^ argument requires that `'1` must outlive `'2`
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= note: requirement occurs because of a mutable reference to `Vec<Ref<'_, i32>>`
= 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
|
LL | fn foo<'a>(x: &mut Vec<Ref<'a, i32>>, y: Ref<'a, i32>) {
| ++++ +++ +++
error: aborting due to 1 previous error
|
