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Auto merge of #79987 - ssomers:btree_cleanup_4, r=Mark-Simulacrum

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BTreeMap: detect bulk_steal's count-1 underflow in release builds too

r? `@Mark-Simulacrum`
This commit is contained in:
bors 2020-12-13 17:09:41 +00:00
commit 69ff39ee32
1 changed files with 2 additions and 0 deletions
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library/alloc/src/collections/btree/node.rs
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@ -1475,6 +1475,7 @@ impl<'a, K: 'a, V: 'a> BalancingContext<'a, K, V> {
/// This does stealing similar to `steal_left` but steals multiple elements at once.
pub fn bulk_steal_left(&mut self, count: usize) {
assert!(count > 0);
unsafe {
let left_node = &mut self.left_child;
let old_left_len = left_node.len();
@ -1532,6 +1533,7 @@ impl<'a, K: 'a, V: 'a> BalancingContext<'a, K, V> {
/// The symmetric clone of `bulk_steal_left`.
pub fn bulk_steal_right(&mut self, count: usize) {
assert!(count > 0);
unsafe {
let left_node = &mut self.left_child;
let old_left_len = left_node.len();