{"ast_node_type":"other","tokens":[{"end":72,"kind":"keyword","start":0,"text":"ty::BoundRegionKind::ClosureEnv"}]}
                            ty::BoundRegionKind::ClosureEnv => sym::env,
                            ty::BoundRegionKind::Named(def_id) => tcx.item_name(def_id),
                            ty::BoundRegionKind::NamedAnon(_) => {