Function rustc_middle::traits::util::supertraits

pub fn supertraits<'tcx>(
    tcx: TyCtxt<'tcx>, 
    trait_ref: PolyTraitRef<'tcx>
) -> impl Iterator<Item = PolyTraitRef<'tcx>>

Given a PolyTraitRef, get the PolyTraitRefs of the trait’s (transitive) supertraits.

A simplfied version of the same function at rustc_infer::traits::util::supertraits.