Mercurial > urweb
diff tests/type_class.ur @ 677:81573f62d6c3
Enforce termination of type class instances
author | Adam Chlipala <adamc@hcoop.net> |
---|---|
date | Thu, 26 Mar 2009 15:54:04 -0400 |
parents | 43430b7190f4 |
children |
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--- a/tests/type_class.ur Thu Mar 26 15:26:35 2009 -0400 +++ b/tests/type_class.ur Thu Mar 26 15:54:04 2009 -0400 @@ -10,10 +10,16 @@ val option_default : t ::: Type -> default t -> default (option t) val pair_default : a ::: Type -> b ::: Type -> default a -> default b -> default (pair a b) + (*val uh_oh : t ::: Type -> default t -> default t*) + class awesome val awesome_default : t ::: Type -> awesome t -> default t val float_awesome : awesome float + + val oh_my : t ::: Type -> awesome (option t) -> awesome (option t) + + val awesome : t ::: Type -> awesome t -> t end = struct class default t = t fun get (t ::: Type) (x : t) = x @@ -24,10 +30,16 @@ fun option_default (t ::: Type) (x : t) = Some x fun pair_default (a ::: Type) (b ::: Type) (x : a) (y : b) = Pair (x, y) + (*fun uh_oh (t ::: Type) (x : t) = x*) + class awesome t = t fun awesome_default (t ::: Type) (x : t) = x val float_awesome = 1.23 + + fun oh_my (t ::: Type) (x : option t) = x + + fun awesome (t ::: Type) (x : t) = x end open M @@ -49,6 +61,8 @@ None => "None" | Some y => show y) +(*val x : option float = awesome*) + fun show_pair (a ::: Type) (b ::: Type) (_ : show a) (_ : show b) : show (pair a b) = mkShow (fn x => case x of