Rollup of 6 pull requests
Successful merges:
- #66648 (Implement clone_from for BTreeMap and BTreeSet)
- #68468 (BTreeMap: tag and explain unsafe internal functions or assert preconditions)
- #68626 (Use termize instead of term_size)
- #68640 (Document remaining undocumented `From` implementations for IPs)
- #68651 (Document `From` implementation for NonZero nums)
- #68655 (Fix revision annotations in borrowck-feature-nll-overrides-migrate)
Failed merges:
r? @ghost