{"ast_node_type":"other","tokens":[{"end":88,"kind":"keyword","start":0,"text":"ty::BoundRegionKind::Named(def_id)"}]}
                            ty::BoundRegionKind::Named(def_id) => tcx.item_name(def_id),
                            ty::BoundRegionKind::Anon => sym::anon,
                            ty::BoundRegionKind::ClosureEnv => sym::env,