Announcing Rust 1.43.0

This release is fairly minor. There are no new major features. We have some new stabilized APIs, some compiler performance improvements, and a small macro-related feature.


As has been the case for a little while now, the standback crate provides some APIs from newer compilers backported to 1.31, re-exporting the stabilized equivalents where possible.

For 1.43, Once::is_completed can't be backported, but the rest have been.

Hopefully this helps anyone trying to use newer APIs without requiring a version bump :slight_smile:

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