Rollup of 6 pull requests - #74387

Closed

Manishearth wants to merge 12 commits into

rust-lang:masterfrom

Manishearth:rollup-36nbdbu

Commits on Jul 7, 2020

Update reference to CONTRIBUTING.md
JohnTitor
committed
85072e3

Commits on Jul 13, 2020

Add and fix BTreeMap comments
ssomers
committed
2aa3133

Commits on Jul 15, 2020

Use local links in the alloc docs.
ehuss
committed
8334419
Move libstd's default feature to libtest
alexcrichton
committed
e158913
Clarify effect of orphan rule changes on From/Into
Janik Rabe
committed
d2fe7a7
Update docs for str::as_bytes_mut.
mbrubeck
committed
6da69ec

Commits on Jul 16, 2020