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Explain not existed key in BTreeMap::split_off #147246

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Explain not existed key in BTreeMap::split_off #147246

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3 changes: 2 additions & 1 deletion library/alloc/src/collections/btree/map.rs
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Expand Up @@ -1368,7 +1368,8 @@ impl<K, V, A: Allocator + Clone> BTreeMap<K, V, A> {
}

/// Splits the collection into two at the given key. Returns everything after the given key,
/// including the key.
/// including the key. If the key is not present, the split will occur at the nearest
/// greater key, or return an empty map if no such key exists.
///
/// # Examples
///
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