code: function PREFIX(operatorsParser, nextParser) {
    let parser = P.lazy(() => {
      return P.seq(operatorsParser, parser).or(nextParser);
    });
    return parser;
  }
docs: Takes a parser for the prefix operator, and a parser for the base thing being parsed, and parses as many occurrences as possible of the prefix operator. Note that the parser is created using `P.lazy` because it's recursive. It's valid for there to be zero occurrences of the prefix operator.