test/tall/expression/collection_for_spread_set.stmt

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### Tests for spread (and unspread) sets inside for elements.
>>> Spread list inside for stays on one line if it fits.
var set = {for (;;) ...{1, 2}};
<<<
var set = {
  for (;;) ...{1, 2},
};
>>> Spread list inside for formats like block if it splits.
var set = {for (;;) ...{element1, element2, element3}};
<<<
var set = {
  for (;;) ...{
    element1,
    element2,
    element3,
  },
};
>>> A split collection that isn't spread wraps and indents.
var set = {for (;;) {element1, element2, element3}};
<<<
var set = {
  for (;;)
    {element1, element2, element3},
};
>>> A split collection that isn't spread wraps and indents.
var set = {for (;;) {element1, element2, element3, element4}};
<<<
var set = {
  for (;;)
    {
      element1,
      element2,
      element3,
      element4,
    },
};
>>> Force split if loop body is for element.
var l = {for (;;) for (c in d) t};
<<<
var l = {
  for (;;)
    for (c in d) t,
};
>>> Force split if loop body is if element.
var set = {
  for (;;) if (c) d
};
<<<
var set = {
  for (;;)
    if (c) d,
};