Some candidates for adding

[theemathas]

The maybe-dangling crate became unnecessary because std implemented a proper MaybeDangling, and used it in ManuallyDrop.

I believe std copied crossbeam-channel into the std mpsc implementation, making the performance of the two the same. Not sure.

proc-macro-hack is superseded by builtin features.

[Turbo87]

feel free to open PRs for these :)

(ideally one PR per crate and ping the current maintainers to give them the opportunity to object or correct the data)