view tests/termination.ur @ 1380:ede95ecb4000

Thanks to Vag Vagoff, catch some cases of an obsolete notation for guarded types in the manual
author Adam Chlipala <adam@chlipala.net>
date Thu, 06 Jan 2011 08:55:53 -0500
parents e0ed0d4dabc9
children
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datatype list a = Nil | Cons of a * list a

fun isNil (t ::: Type) (ls : list t) : bool =
        case ls of
          Nil => True
        | Cons _ => False

fun append (t ::: Type) (ls1 : list t) (ls2 : list t) : list t =
        case ls1 of
          Nil => ls2
        | Cons (x, ls1') => Cons (x, append ls1' ls2)

fun appendR (t ::: Type) (ls2 : list t) (ls1 : list t) : list t =
        case ls1 of
          Nil => ls2
        | Cons (x, ls1') => Cons (x, appendR ls2 ls1')

(*fun naughty (t ::: Type) (ls : list t) : list t = naughty ls*)

fun append1 (t ::: Type) (ls1 : list t) (ls2 : list t) : list t =
        case ls1 of
          Nil => ls2
        | Cons (x, ls1') => Cons (x, append2 ls2 ls1')

and append2 (t ::: Type) (ls2 : list t) (ls1 : list t) : list t =
        case ls1 of
          Nil => ls2
        | Cons (x, ls1') => Cons (x, append1 ls1' ls2)