1 error: unsatisfied lifetime constraints
2 --> $DIR/ex2b-push-no-existing-names.rs:16:5
4 LL | fn foo(x: &mut Vec<Ref<i32>>, y: Ref<i32>) {
5 | - - has type `Ref<'1, i32>`
7 | has type `&mut std::vec::Vec<Ref<'2, i32>>`
8 LL | x.push(y); //~ ERROR lifetime mismatch
9 | ^^^^^^^^^ argument requires that `'1` must outlive `'2`
11 error: aborting due to previous error