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

class Foo extends core::Object {
  field self::Bar _field;
  synthetic constructor •() → self::Foo
    ;
}
class Bar extends core::Object {
  synthetic constructor •() → self::Bar
    ;
}
static method useCallback(dynamic callback) → dynamic
  ;
static method main() → dynamic
  ;