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

class Foo extends core::Object {
  field core::int? field;
  synthetic constructor •() → self::Foo
    ;
  method bar(core::int? x) → core::int?
    ;
}
static method main() → dynamic
  ;
static method test_nullable_function_type_formal_param({() →? core::int f}) → core::int
  ;