{"ast_node_type":"variable","tokens":[{"end":78,"kind":"keyword","start":0,"text":"let"}]}
        let is_question = self.eat(exp!(Question)); // Handle `await? <expr>`.
    fn recover_await_prefix(&mut self, await_sp: Span) -> PResult<'a, (Span, P<Expr>, bool)> {
        let expr = if self.token == token::OpenBrace {