Make FieldOffset covariant with the field type #26
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The documentation states: "A pointer-to-member can be thought of as a function from `&T` to `&U` with matching lifetimes". This updates the PhantomData field to better reflect that statement. Importantly, this removes the `U:` constraints on auto trait impls, making e.g. `FieldOffset<T, U>: Sync` even if `U: !Sync`.
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The documentation states:
This updates the
PhantomDatafield to better reflect that statement. Importantly, this removes theU:constraints on auto trait impls, making e.g.FieldOffset<T, U>: Synceven ifU: !Sync.