code: private function ensureSingleLine(Tokens $tokens, $index)
      {
          $previousToken = $tokens[$index - 1];
          if ($previousToken->isComment() && 0 !== strpos($previousToken->getContent(), '/*')) {
              return false;
          }
  
          $content = Preg::replace('/\R[ \t]*/', '', $tokens[$index]->getContent());
          if ('' !== $content) {
              $tokens[$index] = new Token([T_WHITESPACE, $content]);
          } else {
              $tokens->clearAt($index);
          }
  
          return true;
      }
docs: @param Tokens $tokens
  @param int    $index
  
  @return bool Whether newlines were removed from the whitespace token