library /*isNonNullableByDefault*/;
import self as self;
import "dart:async" as asy;

import "dart:async";

static field void voidValue = null;
static method main() → void {
  self::test1();
  self::test2();
  self::test3();
  self::test4();
  self::test5();
  self::test6();
}
static method test1() → FutureOr<FutureOr<void>> {}
static method test2() → FutureOr<FutureOr<void>> {
  return asy::Future::value<void>(0);
}
static method test3() → FutureOr<FutureOr<void>> {
  return null as{ForNonNullableByDefault} FutureOr<void>;
}
static method test4() → FutureOr<FutureOr<void>> {
  return asy::Future::value<asy::Future<void>>(asy::Future::value<void>(null));
}
static method test5() → FutureOr<FutureOr<void>> {
  return 42;
}
static method test6() → FutureOr<FutureOr<void>> {
  return asy::Future::value<FutureOr<void>?>(42);
}
static method test() → FutureOr<FutureOr<void>> {
  return asy::Future::value<asy::Future<asy::Future<void>>>(asy::Future::value<asy::Future<void>>(asy::Future::value<void>(null)));
}