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### Sets use most of the same formatting code as lists, so we don't test
### all of the edge cases here, just the basics.
>>> Const.
const  {  first  ,  second  }  ;
<<<
const {first, second};
>>> Split.
({first, second, third, fourth, fifth, sixth});
<<<
({
  first,
  second,
  third,
  fourth,
  fifth,
  sixth,
});
>>> With type argument.
<  int  >  {  1  ,  2  };
<<<
<int>{1, 2};
>>> Split in type argument.
var set = <Inner<First, Second, Third, Fourth, Fifth, Sixth>>{};
<<<
var set =
    <
      Inner<
        First,
        Second,
        Third,
        Fourth,
        Fifth,
        Sixth
      >
    >{};
>>> Force split because of contained block.
var s = {first, 1, fn, () {"fn";},third,fourth};
<<<
var s = {
  first,
  1,
  fn,
  () {
    "fn";
  },
  third,
  fourth,
};