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This PR changes the recommendation to add 0.2 impls into HALs.
It keeps the instructions but modifies them slightly to put it behind a feature so that we don't recommend third party HALs violate C-STABLE. How important C-STABLE is for trait implementations is debatable but I still don't think we, as a rust working group, should be recommending use of a 0.2 version of a crate when a 1.0 exists.
Alternatives
We remove this section completely and leave it to HAL authors