{"ast_node_type":"other","tokens":[{"end":68,"kind":"keyword","start":0,"text":"<$V"}]}
                                <$V as ArenaCached>::alloc_in_arena(
                            if mem::needs_drop::<<$V as ArenaCached<'tcx>>::Allocated>() {
                                    |v| _tcx.query_system.arenas.$name.alloc(v),