Yuki Okushi 6a596210a6
Rollup merge of #77569 - ssomers:btree_cleanup_1, r=Mark-Simulacrum
BTreeMap: type-specific variants of node_as_mut and cast_unchecked

Improves debug checking and shortens some expressions. Extracted from #77408
2020-10-14 06:02:17 +09:00
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