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This PR updates the Rust edition of:
from
2018
to2021
. No code changes were required.The GitHub Action that generates a code coverage report uses a pinned nightly version of
rustc
from August 2021, just before edition 2021 was stabilized. I've bumped it to the latest nightly so it can build the new edition.This patch also bumps the version of each crate.
By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.