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// use super::*;
// // Holy Decree:
// // Tragically, Rust will have a cycle of dependencies with the product rule
// // unless we evaluate the coefficients before multiplying:
// // L's Grad implementation requires it to be multiplicable by R's, & vice versa
// // So, unfortunately, evaluate we must
// //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
// // Never mind, this happens all the time, even if we evaluate.
// // I think this is why we need Expr<...> around everything.
// // // Holy Fucking Christ
// //
// // impl<
// // L: ~const Eval<
// // Evaluated: ~const core::ops::Mul<R::Evaluated>
// // + ~const core::ops::Mul<<R::Differentiated as eval::Typed>::Evaluated>,
// // > + ~const Grad
// // + ~const core::ops::Mul<R::Differentiated>,
// // R: ~const Eval<
// // Evaluated: ~const core::ops::Mul<L::Evaluated>
// // + ~const core::ops::Mul<<L::Differentiated as eval::Typed>::Evaluated>,
// // > + ~const Grad
// // + ~const core::ops::Mul<L::Differentiated>,
// // > const grad::Typed for Mul<L, R>
// // where
// // <L::Evaluated as core::ops::Mul<<R::Differentiated as eval::Typed>::Evaluated>>::Output:
// // ~const core::ops::Add<
// // <R::Evaluated as core::ops::Mul<<L::Differentiated as eval::Typed>::Evaluated>>::Output,
// // >,
// // <L as core::ops::Mul<R::Differentiated>>::Output:
// // ~const core::ops::Add<<R as core::ops::Mul<L::Differentiated>>::Output>,
// // <<L as core::ops::Mul<R::Differentiated>>::Output as core::ops::Add<
// // <R as core::ops::Mul<L::Differentiated>>::Output,
// // >>::Output: ~const eval::Eval,
// // {
// // // my sincerest apologies
// // type Differentiated = <<L as core::ops::Mul<R::Differentiated>>::Output as core::ops::Add<
// // <R as core::ops::Mul<L::Differentiated>>::Output,
// // >>::Output;
// // }
// // impl<
// // L: ~const Eval<
// // Evaluated: ~const core::ops::Mul<R::Evaluated>
// // + ~const core::ops::Mul<<R::Differentiated as eval::Typed>::Evaluated>,
// // > + ~const Grad
// // + ~const core::ops::Mul<R::Differentiated>,
// // R: ~const Eval<
// // Evaluated: ~const core::ops::Mul<L::Evaluated>
// // + ~const core::ops::Mul<<L::Differentiated as eval::Typed>::Evaluated>,
// // > + ~const Grad
// // + ~const core::ops::Mul<L::Differentiated>,
// // > const grad::Own for Mul<L, R>
// // where
// // <L::Evaluated as core::ops::Mul<<R::Differentiated as eval::Typed>::Evaluated>>::Output:
// // ~const core::ops::Add<
// // <R::Evaluated as core::ops::Mul<<L::Differentiated as eval::Typed>::Evaluated>>::Output,
// // >,
// // <L as core::ops::Mul<R::Differentiated>>::Output:
// // ~const core::ops::Add<<R as core::ops::Mul<L::Differentiated>>::Output>,
// // <<L as core::ops::Mul<R::Differentiated>>::Output as core::ops::Add<
// // <R as core::ops::Mul<L::Differentiated>>::Output,
// // >>::Output: ~const eval::Eval,
// // {
// // fn grad<U>(self, x: &U) -> Self::Differentiated {
// // let g0 = (&self.0).grad(x);
// // let g1 = (&self.1).grad(x);
// // (self.0 * g1) + (self.1 * g0)
// // }
// // }
// // impl<
// // L: ~const Eval<
// // Evaluated: ~const core::ops::Mul<R::Evaluated>
// // + ~const core::ops::Mul<<R::Differentiated as eval::Typed>::Evaluated>,
// // > + ~const Grad
// // + ~const core::ops::Mul<R::Differentiated>,
// // R: ~const Eval<
// // Evaluated: ~const core::ops::Mul<L::Evaluated>
// // + ~const core::ops::Mul<<L::Differentiated as eval::Typed>::Evaluated>,
// // > + ~const Grad
// // + ~const core::ops::Mul<L::Differentiated>,
// // > const grad::Ref for Mul<L, R>
// // where
// // <L::Evaluated as core::ops::Mul<<R::Differentiated as eval::Typed>::Evaluated>>::Output:
// // ~const core::ops::Add<
// // <R::Evaluated as core::ops::Mul<<L::Differentiated as eval::Typed>::Evaluated>>::Output,
// // >,
// // <L as core::ops::Mul<R::Differentiated>>::Output:
// // ~const core::ops::Add<<R as core::ops::Mul<L::Differentiated>>::Output>,
// // <<L as core::ops::Mul<R::Differentiated>>::Output as core::ops::Add<
// // <R as core::ops::Mul<L::Differentiated>>::Output,
// // >>::Output: ~const eval::Eval,
// // for<'a> &'a L: ~const core::ops::Mul<R::Differentiated>,
// // for<'a> &'a R: ~const core::ops::Mul<L::Differentiated>,
// // for<'a> <&'a L as core::ops::Mul<R::Differentiated>>::Output:
// // ~const core::ops::Add<<&'a R as core::ops::Mul<L::Differentiated>>::Output>,
// // {
// // fn grad<U>(&self, x: &U) -> Self::Differentiated {
// // let g0 = (&self.0).grad(x);
// // let g1 = (&self.1).grad(x);
// // ((&self.0) * g1) + ((&self.1) * g0)
// // }
// // }
// impl<
// L: ~const Grad<
// Evaluated: ~const Eval<
// Evaluated: ~const core::ops::Mul<<R::Differentiated as eval::Typed>::Evaluated>,
// > + ~const core::ops::Mul<R::Evaluated>,
// >,
// R: ~const Grad<Evaluated: ~const Eval>,
// > const grad::Typed for Mul<L, R>
// {
// type Differentiated = ();
// }
// impl<
// L: ~const Grad<
// Evaluated: ~const Eval<
// Evaluated: ~const core::ops::Mul<<R::Differentiated as eval::Typed>::Evaluated>,
// > + ~const core::ops::Mul<R::Evaluated>,
// >,
// R: ~const Grad<
// Evaluated: ~const Eval<
// Evaluated: ~const core::ops::Mul<<L::Differentiated as eval::Typed>::Evaluated>,
// >,
// >,
// > const grad::Own for Mul<L, R>
// {
// fn grad<U>(self, x: &U) -> <Self as grad::Typed>::Differentiated {
// let g0 = (&self.0).grad(x);
// let g1 = (&self.1).grad(x);
// Add(Mul(self.0.eval(), g1), Mul(self.1.eval(), g0))
// }
// }