error: called `Iterator::last` on a `DoubleEndedIterator`; this will needlessly iterate the entire iterator
  --> tests/ui/double_ended_iterator_last_unfixable.rs:7:13
   |
LL |     let _ = subindex.0.last();
   |             ^^^^^^^^^^^------
   |                        |
   |                        help: try: `next_back()`
   |
note: this must be made mutable to use `.next_back()`
  --> tests/ui/double_ended_iterator_last_unfixable.rs:7:13
   |
LL |     let _ = subindex.0.last();
   |             ^^^^^^^^^^
   = note: `-D clippy::double-ended-iterator-last` implied by `-D warnings`
   = help: to override `-D warnings` add `#[allow(clippy::double_ended_iterator_last)]`

error: called `Iterator::last` on a `DoubleEndedIterator`; this will needlessly iterate the entire iterator
  --> tests/ui/double_ended_iterator_last_unfixable.rs:20:36
   |
LL |     println!("Last element is {}", v.0.last().unwrap().0);
   |                                    ^^^^------
   |                                        |
   |                                        help: try: `next_back()`
   |
   = note: this change will alter drop order which may be undesirable
note: this must be made mutable to use `.next_back()`
  --> tests/ui/double_ended_iterator_last_unfixable.rs:20:36
   |
LL |     println!("Last element is {}", v.0.last().unwrap().0);
   |                                    ^^^

error: aborting due to 2 previous errors