syntax_data: {"ast_node_type":"other","tokens":[{"end":28,"kind":"keyword","start":0,"text":")"}]}
source_snippet: ) -> Vec<ty::Region<'tcx>> {
context_before:     existential_predicates: &'tcx ty::List<ty::PolyExistentialPredicate<'tcx>>,
context_after:     let erased_self_ty = tcx.types.trait_object_dummy_self;