library /*isNonNullableByDefault*/;
import self as self;

static method test1(Never n1, Never? n2, Null n3) → dynamic
  ;
static method test2<N1 extends Never = Never, N2 extends Never? = Never?, N3 extends Null = Null>(self::test2::N1 n1, self::test2::N2% n2, self::test2::N3% n3) → dynamic
  ;
static method main() → dynamic
  ;