1 error[E0623]: lifetime mismatch
2 --> $DIR/ex2b-push-no-existing-names.rs:6:12
4 LL | fn foo(x: &mut Vec<Ref<i32>>, y: Ref<i32>) {
5 | -------- -------- these two types are declared with different lifetimes...
7 | ^ ...but data from `y` flows into `x` here
9 error: aborting due to previous error
11 For more information about this error, try `rustc --explain E0623`.