{"ast_node_type":"other","tokens":[{"end":50,"kind":"keyword","start":0,"text":"|"}]}
            | Expr::Call { callee: it, args } => {
            Expr::MethodCall { receiver: it, method_name: _, args, generic_args: _ }
                self.infer_mut_not_expr_iter(args.iter().copied().chain(Some(*it)));