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Make Id::sym and Id::trans into const fns #3

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Make Id::sym and Id::trans into const fns #3

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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 @@ -180,11 +180,11 @@ impl<S: ?Sized, T: ?Sized> Id<S, T> {
}

/// Converts `Id<S, T>` into `Id<T, S>` since type equality is symmetric.
pub fn sym(self) -> Id<T, S> { Id(PhantomData) }
pub const fn sym(self) -> Id<T, S> { Id(PhantomData) }

/// If you have proofs `Id<S, T>` and `Id<T, U>` you can conclude `Id<S, U>`
/// since type equality is transitive.
pub fn trans<U: ?Sized>(self, _: Id<T, U>) -> Id<S, U> { Id(PhantomData) }
pub const fn trans<U: ?Sized>(self, _: Id<T, U>) -> Id<S, U> { Id(PhantomData) }

/// Casts a value of type `&S` to `&T` where `S == T`.
///
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