view tests/type_classMod.ur @ 1623:218e2a9a53d0

Better error messages about non-SQL-izability of types
author Adam Chlipala <adam@chlipala.net>
date Sat, 03 Dec 2011 15:59:21 -0500
parents 71bafe66dbe1
children
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line source
structure M = struct
        structure N = struct
                class c t = t
                val string_c : c string = "Hi"
        end
end

val c : t :: Type -> M.N.c t -> t =
        fn t :: Type => fn pf : M.N.c t => pf
val hi = c [string] _

val bool_c : M.N.c bool = True
val true = c [bool] _
val hi = c [string] _

con c = M.N.c
val int_c : c int = 0
val zero = c [int] _