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error: lifetime may not live long enough
--> $DIR/ex3-both-anon-regions-both-are-structs-latebound-regions.rs:6:5
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LL | fn foo<'a, 'b>(mut x: Vec<Ref<'a>>, y: Ref<'b>) {
| -- -- lifetime `'b` defined here
| |
| lifetime `'a` defined here
LL | x.push(y);
| ^^^^^^^^^ argument requires that `'b` must outlive `'a`
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= help: consider adding the following bound: `'b: 'a`
= 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
error: aborting due to 1 previous error
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