Rollup of 10 pull requests#70275

Merged

bors merged 29 commits intorust-lang:masterfrom

Dylan-DPC-zz:rollup-1fbosob

Mar 22, 2020

Commits on Jan 10, 2020

Ammend Rc/Arc::from_raw() docs regarding unsafety
lukaslueg
committed

Commits on Jan 28, 2020

Refine [Arc/Rc]::from_raw() docs
lukaslueg
committed

Commits on Feb 7, 2020

Make rc::RcBox and sync::ArcInner repr(C)
lukaslueg
committed

Commits on Mar 20, 2020

parse/lexer: support `StringReader::retokenize` called on external files.
eddyb
committed

Commits on Mar 21, 2020

Commits on Mar 22, 2020