Use of Vec<>::remove_item() causes crash despite #![feature]

[StevenJPx2]

error[E0554]: `#![feature]` may not be used on the stable release channel
  --> terramach/terramach/ui/lib.rs:19:1
   |
19 | #![feature(vec_remove_item)]
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error[E0554]: `#![feature]` may not be used on the stable release channel
  --> terramach/terramach/ui/lib.rs:20:1
   |
20 | #![feature(panic_info_message)]
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

This is what I am getting.

Maybe rather than using remove_item(), use a hash map or a handcrafted method?

[StevenJPx2]

Solution

   --> terramach/terramach/ui/common/tree.rs:144:22
    |
144 |             children.remove_item(&id);
    |                      ^^^^^^^^^^^
    |

If the array is sorted...

children.remove(children.binary_search(&id).expect("Index not found"));

If not,

            for (index, item) in children.clone().iter_mut().enumerate() {
                if item == &id {
                    children.remove(index);
                }
            }