warning: eliding a lifetime that's named elsewhere is confusing
  --> $DIR/rpit-assoc-pair-with-lifetime.rs:3:82
   |
LL | pub fn iter<'a>(v: Vec<(u32, &'a u32)>) -> impl DoubleEndedIterator<Item = (u32, &u32)> {
   |                               -- the lifetime is named here                      ^^^^ the same lifetime is elided here
   |
   = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
   = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
help: consistently use `'a`
   |
LL | pub fn iter<'a>(v: Vec<(u32, &'a u32)>) -> impl DoubleEndedIterator<Item = (u32, &'a u32)> {
   |                                                                                   ++

warning: 1 warning emitted