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Rollup merge of #89443 - cuviper:btree-hash-len, r=dtolnay

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Include the length in BTree hashes

This change makes it consistent with `Hash` for all other collections.
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Jubilee 2021-10-04 13:58:11 -07:00 • committed by GitHub
commit e1478d650d
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2 changed files with 13 additions and 2 deletions
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library/alloc/src/collections/btree/map.rs
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@ -1968,6 +1968,7 @@ impl<'a, K: Ord + Copy, V: Copy> Extend<(&'a K, &'a V)> for BTreeMap<K, V> {
#[stable(feature = "rust1", since = "1.0.0")]
impl<K: Hash, V: Hash> Hash for BTreeMap<K, V> {
fn hash<H: Hasher>(&self, state: &mut H) {
self.len().hash(state);
for elt in self {
elt.hash(state);
}