library /*isNonNullableByDefault*/;
import self as self;
import "dart:core" as core;

class C extends core::Object {
  synthetic constructor •() → self::C
    ;
  method f() → self::D?
    ;
  method h() → void
    ;
}
class D extends core::Object {
  synthetic constructor •() → self::D
    ;
  method g() → void
    ;
}
static method test(self::C x) → void
  ;
static method main() → dynamic
  ;