{"ast_node_type":"variable","tokens":[{"end":81,"kind":"keyword","start":0,"text":"let"}]}
        let pat = self.parse_pat_no_top_alt(Some(Expected::ArgumentName), None)?;
    pub(super) fn recover_arg_parse(&mut self) -> PResult<'a, (P<ast::Pat>, P<ast::Ty>)> {
        self.expect(exp!(Colon))?;