warning: elided lifetime has a name
  --> $DIR/rpit-assoc-pair-with-lifetime.rs:3:82
   |
LL | pub fn iter<'a>(v: Vec<(u32, &'a u32)>) -> impl DoubleEndedIterator<Item = (u32, &u32)> {
   |             -- lifetime `'a` declared here                                       ^ this elided lifetime gets resolved as `'a`
   |
   = note: `#[warn(elided_named_lifetimes)]` on by default

warning: 1 warning emitted