message: Use explicit `dyn` trait object
diff: @@ -18,7 +18,7 @@ use crate::AllocMap;
  pub struct MonoHashMap<K: Hash + Eq, V>(RefCell<FxHashMap<K, Box<V>>>);
  impl<K: Hash + Eq, V> MonoHashMap<K, V> {
  - pub fn values<T>(&self, f: impl FnOnce(&mut Iterator<Item=&V>) -> T) -> T {
  + pub fn values<T>(&self, f: impl FnOnce(&mut dyn Iterator<Item=&V>) -> T) -> T {
  f(&mut self.0.borrow().values().map(|v| &**v))
  }
  }
  