error: lifetime may not live long enough --> $DIR/ex3-both-anon-regions-using-impl-items.rs:6:9 | LL | fn foo(x: &mut Vec<&u8>, y: &u8) { | - - let's call the lifetime of this reference `'1` | | | let's call the lifetime of this reference `'2` LL | x.push(y); | ^^^^^^^^^ argument requires that `'1` must outlive `'2` | help: consider introducing a named lifetime parameter and update trait if needed | LL | fn foo<'a>(x: &mut Vec<&'a u8>, y: &'a u8) { | ++++ ++ ++ error: aborting due to previous error