23461b210f
BTree: merge the complication introduced by #81486 and #86031 Also: - Deallocate the last few tree nodes as soon as an `into_iter` iterator steps beyond the end, instead of waiting around for the drop of the iterator (just to share more code). - Symmetric code for backward iteration. - Mark unsafe the methods on dying handles, modelling dying handles after raw pointers: it's the caller's responsibility to use them safely. r? `@Mark-Simulacrum` |
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