test/tall/expression/set_nested.stmt

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### Tests that nested collections force outer ones to split.
>>> Nested non-empty list forces outer set to split.
set = {[inner]};
<<<
set = {
  [inner],
};
>>> Nested non-empty map forces outer set to split.
set = {{key: inner}};
<<<
set = {
  {key: inner},
};
>>> Nested non-empty set forces outer set to split.
set = {{inner}};
<<<
set = {
  {inner},
};
>>> Nested non-empty record does not force outer set to split.
set = {(inner,)};
<<<
set = {(inner,)};
>>> Nested empty collection does not force outer set to split.
set = {[], {}, ()};
<<<
set = {[], {}, ()};
>>> Split outer sets even if they fit.
var s = {a, {b, c}, d, {},
    e, {f, {g, h} }  };
<<<
var s = {
  a,
  {b, c},
  d,
  {},
  e,
  {
    f,
    {g, h},
  },
};
>>> Split indirect outer set.
var s = {a, function({b, inner})};
<<<
var s = {
  a,
  function({b, inner}),
};
>>> Empty literal does not force outer split.
var s = {a, <int>{}, b, [], c, () {}};
<<<
var s = {a, <int>{}, b, [], c, () {}};
>>> Nested split set.
var s = {first, 1, second, {third, fourth}, fifth, 5, nested, {sixth, seventh, eighth, nine,
    tenth, eleventh}};
<<<
var s = {
  first,
  1,
  second,
  {third, fourth},
  fifth,
  5,
  nested,
  {
    sixth,
    seventh,
    eighth,
    nine,
    tenth,
    eleventh,
  },
};