{"ast_node_type":"other","tokens":[{"end":98,"kind":"keyword","start":0,"text":"self.pat_ident_binding_mode(head_span,"}]}
                    self.pat_ident_binding_mode(head_span, iter_ident, hir::BindingMode::REF_MUT);
                let (async_iter_pat, async_iter_pat_id) =
                let iter = self.expr_ident_mut(head_span, iter_ident, async_iter_pat_id);