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error: lifetime may not live long enough
--> $DIR/ex3-both-anon-regions-one-is-struct-5.rs:10:5
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LL | fn bar(foo: &mut Foo) {
| --- - let's call the lifetime of this reference `'1`
| |
| has type `&mut Foo<'2>`
LL | foo.modify();
| ^^^^^^^^^^^^ argument requires that `'1` must outlive `'2`
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= note: requirement occurs because of a mutable reference to `Foo<'_>`
= 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
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LL | fn bar<'a>(foo: &'a mut Foo<'a>) {
| ++++ ++ ++++
error: aborting due to 1 previous error
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