fn f(x:i32) = {
  def d = emit{i32, 'change', x}
  a := d     # New handle
  b := x     # New handle
  def c = b  # Aliases b
  a = 4
  c = d
  x = a
  b
}

fn g() : __pnt{i32} = {
  b:i32 = 5
  c := b
  c = 6
  a:__pnt{i32} = tup{b,b}
  ac := a
# a = cast{__pnt{i32},tup{b,c}}  # Problems with C output for this
  ac
}