Rollup of 8 pull requests#93390

Merged

bors merged 23 commits intorust-lang:masterfrom

matthiaskrgr:rollup-4xeki5w

Jan 28, 2022

Commits on Dec 7, 2021

Define c_char using cfg_if rather than repeating 40-line cfg
dtolnay
committed

Commits on Dec 8, 2021

Work around Clippy false positive on `as c_char`
dtolnay
committed

Commits on Jan 24, 2022

Add test stable hash uniqueness of adjacent field values
Kobzol
committed

Commits on Jan 25, 2022

Rename `TypedArenaChunk` as `ArenaChunk`.
nnethercote
committed

Commits on Jan 27, 2022