syntax_data: {"ast_node_type":"other","tokens":[{"end":88,"kind":"keyword","start":0,"text":"&'tcx"}]}
source_snippet:     &'tcx ty::List<ty::PolyExistentialPredicate<'tcx>> : mk_poly_existential_predicates,
context_before: list_fold! {
context_after:     &'tcx ty::List<PlaceElem<'tcx>> : mk_place_elems,