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# Example program showing 'return-continuation-until-mark' return other values
# alongside continuations.
#
# Print out a given list of numbers.
#
# To run:
#   $ git clone https://github.com/akkartik/mu
#   $ cd mu
#   $ ./mu continuation4.mu
#
# Expected output:
#   1
#   2
#   3

def main [
  local-scope
  l:&:list:num <- copy null
  l <- push 3, l
  l <- push 2, l
  l <- push 1, l
  k:continuation, x:num, done?:bool <- call-with-continuation-mark 100/mark, create-yielder, l
  {
    break-if done?
    $print x 10/newline
    k, x:num, done?:bool <- call k
    loop
  }
]

def create-yielder l:&:list:num -> n:num, done?:bool [
  local-scope
  load-inputs
  {
    done? <- equal l, null
    break-if done?
    n <- first l
    l <- rest l
    return-continuation-until-mark 100/mark, n, done?
    loop
  }
  # A function that returns continuations shouldn't get the opportunity to
  # return. Calling functions should stop calling its continuation after this
  # point.
  return-continuation-until-mark 100/mark, -1, done?
  assert false, [called too many times, ran out of continuations to return]
]