anchor.diff:  }
   
   String getLang(Locale l) => l == null
  -    ? null
  -    : l.countryCode != null && l.countryCode.isEmpty
  -        ? l.languageCode
  -        : l.toString();
  +  ? null
  +  : l.countryCode != null && l.countryCode.isEmpty
  +    ? l.languageCode
  +    : l.toString();
  
positive.code:     };
    }
  
    LocaleResolutionCallback resolution(
        {Locale fallback, bool withCountry = true}) {
      return (Locale locale, Iterable<Locale> supported) {
        return _resolve(locale, fallback, supported, withCountry);
      };
  
negative.code:           S.current = const $en();
            return SynchronousFuture<S>(S.current);
          default:
            // NO-OP.
        }
      }
      S.current = const S();
  