Add methods to replace the key at a given index #405
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Maps and sets may fail if the new key/value is already present elsewhere, but we know that's not the case for `VacantEntry`. * `IndexMap::replace_index(&mut self, index: usize, key: K) -> Result<K, (usize, K)>` * `IndexSet::replace_index(&mut self, index: usize, value: T) -> Result<T, (usize, T)>` * `VacantEntry::replace_index(self, index: usize) -> (K, OccupiedEntry<'a, K, V>)`
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Maps and sets may fail if the new key/value is already present
elsewhere, but we know that's not the case for
VacantEntry.IndexMap::replace_index(&mut self, index: usize, key: K) -> Result<K, (usize, K)>IndexSet::replace_index(&mut self, index: usize, value: T) -> Result<T, (usize, T)>VacantEntry::replace_index(self, index: usize) -> (K, OccupiedEntry<'a, K, V>)Resolves #404.