+ let trait_pred = ty::TraitPredicate {
+ trait_ref,
+ constness: match constness {
+ hir::Constness::Const => ty::BoundConstness::ConstIfConst,
+ hir::Constness::NotConst => ty::BoundConstness::NotConst,
+ },
+ polarity: ty::ImplPolarity::Positive,
+ };