I'm happy with the change. Thank you for your detailed analysis: #488 (comment)

bors r+

Build succeeded

• test (crossbeam-queue, nightly)
• test (crossbeam-skiplist, 1.28.0)
• test (crossbeam, nightly)
• test (crossbeam-utils, nightly)
• test (crossbeam-deque, 1.28.0)
• test (crossbeam, 1.28.0)
• test (crossbeam-channel, 1.28.0)
• test (crossbeam-epoch, 1.28.0)
• test (crossbeam-channel, nightly)
• rustfmt
• test (crossbeam-utils, 1.28.0)
• test (crossbeam-queue, 1.28.0)
• dependencies
• test (crossbeam-deque, nightly)
• test (crossbeam-skiplist, nightly)
• test (crossbeam-epoch, nightly)

Dear @taiki-e,

It seems old PRs not are tested with the new CI, e.g., #485 . Do you happen to know how to test them in the new CI?

@jeehoonkang
Unfortunately, I think it needs to rebase (or merge master branch to PR's branch).

(However, as bors run the test when merging, if PR is likely to pass the test, we may be able to use bors.).