1 error[E0621]: explicit lifetime required in the type of `x`
2 --> $DIR/ex2a-push-one-existing-name-2.rs:6:5
4 LL | fn foo<'a>(x: Ref<i32>, y: &mut Vec<Ref<'a, i32>>) {
5 | -------- help: add explicit lifetime `'a` to the type of `x`: `Ref<'a, i32>`
7 | ^^^^^^^^^ lifetime `'a` required
9 error: aborting due to previous error
11 For more information about this error, try `rustc --explain E0621`.