Rollup of 6 pull requests - #68659

Merged

bors merged 18 commits into

rust-lang:masterfrom

Dylan-DPC-zz:rollup-zo7zi9f

Jan 30, 2020

Commits on Dec 23, 2019

Make RangeMut::next_unchecked() output a mutable key reference
crgl
committed
293cdf7
Implement clone_from for BTree collections
crgl
committed
f547978
Add test for BTreeMap::clone_from
crgl
committed
8651aa0

Commits on Jan 28, 2020

Format safety comment as per tidy

crgl
and
KodrAus
authored
3caa17b
Include empty BTreeMap in clone_from tests
crgl
committed
60a7c94
Add private is_empty method to RangeMut
crgl
committed
81b6f8c
Reformat truncation section of clone_from
crgl
committed
6c3e477

Commits on Jan 30, 2020