Fix & test leak of some BTreeMap nodes on panic during into_iter#69776
Merged
bors merged 1 commit intorust-lang:masterfrom Mar 8, 2020 
Merged
Fix & test leak of some BTreeMap nodes on panic during `into_iter`#69776bors merged 1 commit intorust-lang:masterfrom 
bors merged 1 commit intorust-lang:masterfrom