anchor.diff:          test('none', () {
             var trace = [];
             int log(int a, int b) {
  -            trace..add(a)..add(b);
  +            trace
  +              ..add(a)
  +              ..add(b);
               return b;
             }
   
  
positive.code:         test('multiple some', () {
            var log = [];
            ['a', 'b', 'c'].forEachIndexedWhile((i, s) {
              log..add(i)..add(s);
              return s != 'b';
            });
            expect(log, [0, 'a', 1, 'b']);
  
negative.code:         test('multiple one', () {
            var log = [];
            iterable(['a', 'b', 'c']).forEachIndexedWhile((i, s) {
              log
                ..add(i)
                ..add(s);
              return false;
            });
            expect(log, [0, 'a']);
  