// Test spreading into array and dictionary.
#{
  let l = (1, 2, 3)
  let r = (5, 6, 7)
  test((..l, 4, ..r), range(1, 8))
  test((..none), ())
}

#{
  let x = (a: 1)
  let y = (b: 2)
  let z = (a: 3)
  test((:..x, ..y, ..z), (a: 3, b: 2))
  test((..(a: 1), b: 2), (a: 1, b: 2))
}