XVilka

/// This type is only every inhabited when S is nominally equivalent to T
#[derive(Debug)]
pub struct Is<S, T>(::std::marker::PhantomData<(*const S, *const T)>);

// Construct a proof of the fact that a type is nominally equivalent
// to itself.
pub fn is<T>() -> Is<T, T> { Is(::std::marker::PhantomData) }

// std::mem::transmute does not accept unsubstituted type parameters
// manual transmute as suggested by manual