{"ast_node_type":"other","tokens":[{"end":44,"kind":"keyword","start":0,"text":".map(|assoc_items|"}]}
                        .map(|assoc_items| {
                        .map(|def_id| self.infcx.tcx.associated_items(def_id))
                            assoc_items.filter_by_name_unhygienic(sym::iter_mut).peekable()