const List<bool> listWithUnevaluated = [
  bool.fromEnvironment("foo"),
  bool.fromEnvironment("bar"),
  true,
];
const List<bool> listWithUnevaluatedSpread = [
  true,
  ...listWithUnevaluated,
  false
];
const Map<bool> MapWithUnevaluated = {
  bool.fromEnvironment("foo"): bool.fromEnvironment("bar"),
};
const Set<bool> setWithUnevaluated = {
  bool.fromEnvironment("foo"),
  bool.fromEnvironment("bar"),
  true,
};
const Set<bool> setWithUnevaluatedSpread = {true, ...setWithUnevaluated, false};
const a = <int>[];
const b = <int?>[];
const mapNotAgnosticOK = {a: 0, b: 1};
const setNotAgnosticOK = {a, b};
main() {}