code: protected function applyFix(\SplFileInfo $file, Tokens $tokens)
      {
          foreach ($tokens as $index => $token) {
              if ($token->isGivenKind(CT::T_ARRAY_INDEX_CURLY_BRACE_OPEN)) {
                  $tokens[$index] = new Token('[');
              } elseif ($token->isGivenKind(CT::T_ARRAY_INDEX_CURLY_BRACE_CLOSE)) {
                  $tokens[$index] = new Token(']');
              }
          }
      }
docs: {@inheritdoc}