static ItIt<JavaClass> bcel_classesInZip_iterator(final File zip) {
  ret mapI(func(S name) -> JavaClass { bcel_classInZip(zip, name) },
    classFilesInZip(zip));
}

static ItIt<JavaClass>  bcel_classesInZip_iterator(S zip) {
  ret bcel_classesInZip_iterator(newFile(zip));
}