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Make FieldOffset covariant with the field type #26

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Make FieldOffset covariant with the field type #26

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4 changes: 2 additions & 2 deletions src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -52,12 +52,12 @@ pub struct FieldOffset<T, U, PinFlag = NotPinned>(
/// of.apply(foo)
/// }
/// ```
PhantomData<(PhantomContra<T>, U, PinFlag)>,
PhantomData<(PhantomFn<T, U>, PinFlag)>,
);

/// `fn` cannot appear directly in a type that need to be const.
/// Workaround that with an indirection
struct PhantomContra<T>(fn(T));
struct PhantomFn<T, U>(fn(T) -> U);

/// Type that can be used in the `PinFlag` parameter of `FieldOffset` to specify that
/// this projection is valid on Pin types.
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