define (
{{
  desc:
    List initializer.
  test:
    in: nil
    out: [] list
}}
{ nil }

define ,
{{
  desc:
    List separator.
}}
{ cons }

define )
{{
  desc:
    List terminator.
}}
{ cons }

define ()
{{
  desc:
    Empty list.
}}
{ nil }

// This will be useful for implementing a better split function, among other things
define do_while : ('A list ('A 'a -> 'A bool) -> 'A list)
{{
  desc:
    An early-terminating fold.
}}
{
  ...
}

// This requires "count_while" which is not currently implemented.
define index_of : (list 'a -> list int)
{{
  desc:
    Returns the index of a value in a list or the size of the list
    if not found.
  test:
    in: [1 2 3 4] list 1 index_of popd
    out: 3
  test:
    in: ['a' 'b' 'c'] list 'c' index_of popd
    out: 0
  test:
    in: ['a' 'b' 'c'] list 'd' index_of popd
    out: 3
}}
{
  [neq] papply count_while
}