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import java.nio.file.DirectoryStream // this is Iterable[Path]
import scala.collection.JavaConversions._

                // there's a file entry in directory on which following loops should return

                // this works
                val dirs = Files.newDirectoryStream(appDir)
                val it = dirs.iterator
                while (it.hasNext) { // do something and return
                }
                throw new ArchiveNotFoundException(this, name, suffix)

                // this doesn't work
                val dirs = Files.newDirectoryStream(appDir)
                for (path <- dirs) { // do something and return
                }
                throw new ArchiveNotFoundException(this, name, suffix)