Port to rand 0.9

Per discussion on #1774 (closed), it's now okay to port to rand 0.9. There was a bit of work here, but !2868 (merged) helped some.

This branch is split up into several intermediate commits, each of which fixes a separate issue. I hope that this will make it easier to review.

assigned to @nickm

requested review from @ahf

(A couple of the build issues seem real; fixing now.)

Okay, should be better now.

added 2 commits

• 99a5fca9 - Update Cargo.lock in bench directories.
• dbb4f545 - proto: make padding::Parameters construction fallible.

Compare with previous version

@nickm This looks good to me, feel free to merge it.

I was a bit confused that for Parameters that low == high was OK, but you have a unit-test case for it, so I assume that is correct there.

Feel free to merge it when you want to. I have restarted the failing test runs. The shadow one depend upon an artifact that isn't available, but I think we can ignore that here. Let's see if the others get happy.

approved this merge request

mentioned in commit 76b21399

merged

mentioned in issue #1774 (closed)

mentioned in issue #1902 (closed)

mentioned in merge request !2876 (closed)