{"ast_node_type":"other","tokens":[{"end":40,"kind":"keyword","start":0,"text":"//"}]}
        // Parse optional `for<'a, 'b>`.
    fn parse_ty_where_predicate_kind(&mut self) -> PResult<'a, ast::WherePredicateKind> {
        // This `for` is parsed greedily and applies to the whole predicate,