{"ast_node_type":"variable","tokens":[{"end":86,"kind":"keyword","start":0,"text":"let"}]}
        let is_questionmark = self.look_ahead(1, |t| t == &token::Bang); //check for !
        let is_try = self.token.is_keyword(kw::Try);
        let is_open = self.look_ahead(2, |t| t == &token::OpenParen); //check for (