{"ast_node_type":"variable","tokens":[{"end":89,"kind":"keyword","start":0,"text":"let"}]}
            let is_empty = self.token == token::CloseParen; //check if the block is empty
            self.bump(); //remove (
            self.consume_block(exp!(OpenParen), exp!(CloseParen), ConsumeClosingDelim::No); //eat the block