checkPackageDbStack _ =
  die $ "GHC.getInstalledPackages: the global package db must be "
     ++ "specified first and cannot be specified multiple times"
checkPackageDbStack _ =
  die $ "GHC.getInstalledPackages: the global package db must be "
     ++ "specified first and cannot be specified multiple times"
checkPackageDbStack _ =
  die $ "GHC.getInstalledPackages: the global package db must be "
     ++ "specified first and cannot be specified multiple times"