code: public function process(File $phpcsFile, $stackPtr)
      {
          $tokens = $phpcsFile->getTokens();
  
          $error   = 'Use of constant "%s" is forbidden';
          $nextVar = $tokens[$phpcsFile->findNext([T_STRING], $stackPtr)];
          $varName = $nextVar['content'];
          $data    = [$varName];
  
          $phpcsFile->addError($error, $stackPtr, 'NotAllowed', $data);
      }
docs: {@inheritdoc}