{"ast_node_type":"other","tokens":[{"end":65,"kind":"keyword","start":0,"text":"for"}]}
            for (from, to) in from_traits.iter().zip(to_traits) {
            // FIXME(dyn-star): Do the right thing with DynKinds
                let from = fx.tcx.normalize_erasing_late_bound_regions(fx.typing_env(), from);