code: public function markAliasUninstalled(RepositoryInterface $repo, MarkAliasUninstalledOperation $operation)
      {
          $package = $operation->getPackage();
  
          $repo->removePackage($package);
      }
docs: Executes markAlias operation.
  
  @param RepositoryInterface           $repo      repository in which to check
  @param MarkAliasUninstalledOperation $operation operation instance