indextree 4.8.1

Arena based tree structure by using indices instead of reference counted pointers
Documentation 
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//! Insertion errors.

use indextree::Arena;

#[test]
fn append_self() {
    let mut arena = Arena::new();
    let n1 = arena.new_node("1");
    assert!(n1.checked_append(n1, &mut arena).is_err());
}

#[test]
fn prepend_self() {
    let mut arena = Arena::new();
    let n1 = arena.new_node("1");
    assert!(n1.checked_prepend(n1, &mut arena).is_err());
}

#[test]
fn insert_after_self() {
    let mut arena = Arena::new();
    let n1 = arena.new_node("1");
    assert!(n1.checked_insert_after(n1, &mut arena).is_err());
}

#[test]
fn insert_before_self() {
    let mut arena = Arena::new();
    let n1 = arena.new_node("1");
    assert!(n1.checked_insert_before(n1, &mut arena).is_err());
}