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Add roles declarations to allow safe coercions #28

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Add roles declarations to allow safe coercions #28

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@kl0tl kl0tl commented Sep 12, 2020

This allows terms of type Ref a to be coerced to type Ref b when Coercible a b holds, hence allowing the zero cost coerce instead of map wrap and map unwrap to introduce and eliminate newtypes under mutable references for instance.

@JordanMartinez JordanMartinez mentioned this pull request Oct 6, 2020
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Merged in #29

@hdgarrood hdgarrood closed this Oct 11, 2020
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