Mercurial > urweb
view lib/ur/option.urs @ 904:6d9538ce94d8
Fix type class resolution infinite loop, discovered while meeting with Ezra
author | Adam Chlipala <adamc@hcoop.net> |
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date | Thu, 06 Aug 2009 15:23:04 -0400 |
parents | 0d30e6338c65 |
children | da3ec6014d2f |
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datatype t = datatype Basis.option val eq : a ::: Type -> eq a -> eq (t a) val isSome : a ::: Type -> t a -> bool val mp : a ::: Type -> b ::: Type -> (a -> b) -> t a -> t b val bind : a ::: Type -> b ::: Type -> (a -> option b) -> t a -> t b