{"ast_node_type":"other","tokens":[{"end":46,"kind":"keyword","start":0,"text":"(true,"}]}
            (true, false) => self.parse_ty()?,
        let ty = match (self.eat(exp!(Colon)), self.check(exp!(Eq)) | self.check(exp!(Semi))) {
            // If there wasn't a `:` or the colon was followed by a `=` or `;`, recover a missing