pub fn supertraits<I>(
    cx: I,
    trait_ref: Binder<I, TraitRef<I>>,
) -> FilterToTraits<I, Elaborator<I, <I as Interner>::Clause>> ⓘwhere
    I: Interner,pub fn supertraits<I>(
    cx: I,
    trait_ref: Binder<I, TraitRef<I>>,
) -> FilterToTraits<I, Elaborator<I, <I as Interner>::Clause>> ⓘwhere
    I: Interner,