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error: lifetime may not live long enough
--> $DIR/ex3-both-anon-regions-both-are-structs.rs:6:5
|
LL | fn foo(mut x: Vec<Ref>, y: Ref) {
| ----- - has type `Ref<'1>`
| |
| has type `Vec<Ref<'2>>`
LL | x.push(y);
| ^^^^^^^^^ argument requires that `'1` must outlive `'2`
|
= note: requirement occurs because of a mutable reference to `Vec<Ref<'_>>`
= 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>(mut x: Vec<Ref<'a>>, y: Ref<'a>) {
| ++++ ++++ ++++
error: aborting due to 1 previous error
|
