decl flow_control_test : Unit -> Unit
def flow_control_test = {
  if ((a < b) || (a == b)) && (b < c) then IO.print: x
  elif x < 0 then {
    ; ++x
    ; IO.print: y
  } else {
    return {}
  }

  while (a > 0) && (!array.is_empty:) do {
    ; --a
    ; array.pop:
  }

  while x < 10 do
    x += x + 3

  for i in 0..y do {
    ; IO.print: i
  }

  for & i & j in (& 0..y & 0..k) do {
    ; IO.print: 1
    ; IO.print: 2
    ; IO.print: 128
  }

  loop {
    ; ++y
    if y > 100 then
      break
  }
}