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error: lifetime may not live long enough
--> $DIR/ex3-both-anon-regions-latebound-regions.rs:2:5
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LL | fn foo<'a,'b>(x: &mut Vec<&'a u8>, y: &'b u8) {
| -- -- lifetime `'b` defined here
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| 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<&u8>`
= 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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