diff options
Diffstat (limited to 'tests/functor.ur')
-rw-r--r-- | tests/functor.ur | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/tests/functor.ur b/tests/functor.ur new file mode 100644 index 00000000..5adfb597 --- /dev/null +++ b/tests/functor.ur @@ -0,0 +1,37 @@ +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 |