syntax_data: {"ast_node_type":"other","tokens":[{"end":60,"kind":"keyword","start":0,"text":"tcx.predicates_of(def_id).instantiate_identity(tcx);"}]}
source_snippet:         tcx.predicates_of(def_id).instantiate_identity(tcx);
context_before:     let ty::InstantiatedPredicates { mut predicates, .. } =