40 columns                              |
>>> Empty.
[];
<<<
[];
>>> Const.
const  [  1  ,  2  ,  3  ]  ;
<<<
const [1, 2, 3];
>>> Exactly page width.
[  first  ,  second  ,  third  ,  fourth  ,  seventh  ]  ;
<<<
[first, second, third, fourth, seventh];
>>> Split.
[first, second, third, fourth, fifth, sixth,];
<<<
[
  first,
  second,
  third,
  fourth,
  fifth,
  sixth,
];
>>> Add trailing comma if split.
[first, second, third, fourth, fifth, sixth];
<<<
[
  first,
  second,
  third,
  fourth,
  fifth,
  sixth,
];
>>> Remove trailing comma if unsplit.
[first, second, third, fourth, fifth,];
<<<
[first, second, third, fourth, fifth];
>>> Split in element forces list to split.
[first + second + third + fourth + fifth];
<<<
[
  first +
      second +
      third +
      fourth +
      fifth,
];
>>> Remove blank lines before first and last elements. Preserve one between.
[


  firstElement,


  secondElement,


  thirdElement


];
<<<
[
  firstElement,

  secondElement,

  thirdElement,
];
>>> Discard blank lines if doesn't need to split.
[


  1,


  2,


  3,


];
<<<
[1, 2, 3];
>>> With type argument.
<  int  >  [  1  ,  2  ,  3  ];
<<<
<int>[1, 2, 3];
>>> Split list but not type arguments.
<Map<int, String>>
[firstElement, secondElement, thirdElement];
<<<
<Map<int, String>>[
  firstElement,
  secondElement,
  thirdElement,
];
>>> Split type arguments but not list.
<Map<VeryLongTypeName, AnotherLongTypeName>>[1, 2, 3];
<<<
<
  Map<
    VeryLongTypeName,
    AnotherLongTypeName
  >
>[1, 2, 3];
>>> Split type arguments and list.
<Map<VeryLongTypeName, AnotherLongTypeName>>[firstElement, secondElement,
thirdElement];
<<<
<
  Map<
    VeryLongTypeName,
    AnotherLongTypeName
  >
>[
  firstElement,
  secondElement,
  thirdElement,
];
>>> Split in nested type argument.
<Map<List<NotSplit>, Map<VeryLongTypeName, AnotherLongTypeName>>>[1, 2, 3];
<<<
<
  Map<
    List<NotSplit>,
    Map<
      VeryLongTypeName,
      AnotherLongTypeName
    >
  >
>[1, 2, 3];
>>> Force split because of contained block.
[first, () {"fn";},third,fourth];
<<<
[
  first,
  () {
    "fn";
  },
  third,
  fourth,
];