{"ast_node_type":"variable","tokens":[{"end":30,"kind":"keyword","start":0,"text":"let"}]}
        let generic_arg_list =
    pub fn ty_result(&self, t: ast::Type, e: ast::Type) -> ast::PathType {
            self.generic_arg_list([self.type_arg(t).into(), self.type_arg(e).into()], false);