library /*isNonNullableByDefault*/;
//
// Problems in library:
//
// pkg/front_end/testcases/general/issue47728_1.dart:7:11: Error: Can't create typedef from nullable type.
// typedef A = Function()?;
//           ^
//
import self as self;
import "dart:core" as core;

typedef A = invalid-type;
class B extends core::Object {
  synthetic constructor •() → self::B
    : super core::Object::•()
    ;
}
class C = core::Object with self::B {
  synthetic constructor •() → self::C
    : super core::Object::•()
    ;
}
static method main() → dynamic {}