anchor.diff:          test('multiple all', () {
             var log = [];
             ['a', 'b', 'c'].forEachIndexedWhile((i, s) {
  -            log..add(i)..add(s);
  +            log
  +              ..add(i)
  +              ..add(s);
               return true;
             });
             expect(log, [0, 'a', 1, 'b', 2, 'c']);
  
positive.code:         test('single true', () {
            var log = [];
            ['a'].forEachIndexedWhile((i, s) {
              log..add(i)..add(s);
              return true;
            });
            expect(log, [0, 'a']);
  
negative.code:         test('no split', () {
            var trace = [];
            bool log(i, x) {
              trace
                ..add('$i')
                ..add(x);
              return false;
            }
  
  