anchor.diff:        });
         test('single', () {
           final set = Multiset.of(['a', 'a', 'b', 'b', 'b']);
  -        set..remove('a')..remove('b');
  +        set
  +          ..remove('a')
  +          ..remove('b');
           expect(set, isNot(isEmpty));
           expect(set, hasLength(3));
           expect(set, unorderedEquals(['a', 'b', 'b']));
  
positive.code:         expect(set.counts, unorderedEquals([1, 2]));
        });
        test('multiple', () {
          final set = Multiset()..add('a', 2)..add('b', 3);
          expect(set, isNot(isEmpty));
          expect(set, hasLength(5));
          expect(set, unorderedEquals(['a', 'a', 'b', 'b', 'b']));
  
negative.code:         expect(set.counts, unorderedEquals([]));
        });
        test('single', () {
          final set = Multiset()
            ..add('a')
            ..add('b')
            ..add('b');
          expect(set, isNot(isEmpty));
          expect(set, hasLength(3));
          expect(set, unorderedEquals(['a', 'b', 'b']));
  