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### view tests/functor.ur @ 2307:6ae9a2784a45

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author | Adam Chlipala <adam@chlipala.net> |
---|---|

date | Sun, 20 Dec 2015 14:39:50 -0500 |

parents | 71bafe66dbe1 |

children |

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signature S = sig type t val z : t val s : t -> t end signature T = sig type t val three : t end functor F (M : S) : T where type t = M.t = struct type t = M.t val three = M.s (M.s (M.s M.z)) end structure O = F (struct type t = int val z = 0 val s = fn x : t => x end) val three : int = O.three structure S = struct type t = int val z = 0 val s = fn x : t => x end structure SO = F (S) val three : int = SO.three structure SS : S = S structure SSO = F (SS) val three : SS.t = SSO.three val main = three