code: function checkCombinator2(i) {
    if (i + 1 >= tokensLength) return 0;
  
    if (tokens[i].type === TokenType.VerticalLine &&
        tokens[i + 1].type === TokenType.VerticalLine) return 2;
  
    if (tokens[i].type === TokenType.GreaterThanSign &&
        tokens[i + 1].type === TokenType.GreaterThanSign) return 2;
  
    return 0;
  }
docs: (1) `||`
  (2) `>>`
  
  @param {number} i
  @return {number}