adamc@329: con idT = fn t :: Type => t
adamc@329: con record = fn t :: {Type} => $t
adamc@329: 
adamc@325: con mapTT (f :: Type -> Type) = fold (fn nm t acc => [nm] ~ acc =>
adamc@325:         [nm = f t] ++ acc) []
adamc@325: 
adamc@325: fun compose (t1 ::: Type) (t2 ::: Type) (t3 ::: Type) (f1 : t2 -> t3) (f2 : t1 -> t2) (x : t1) = f1 (f2 x)
adamc@325: 
adamc@325: fun txt (t ::: Type) (ctx ::: {Unit}) (use ::: {Type}) (sh : show t) (v : t) = cdata (show sh v)
adamc@328: 
adamc@329: val foldTR2 (tf1 :: Type -> Type) (tf2 :: Type -> Type) (tr :: {Type} -> Type)
adamc@328:         (f : nm :: Name -> t :: Type -> rest :: {Type} -> [nm] ~ rest
adamc@328:                 -> tf1 t -> tf2 t -> tr rest -> tr ([nm = t] ++ rest))
adamc@328:         (i : tr []) =
adamc@328:         fold [fn r :: {Type} => $(mapTT tf1 r) -> $(mapTT tf2 r) -> tr r]
adamc@328:                 (fn (nm :: Name) (t :: Type) (rest :: {Type}) (acc : _ -> _ -> tr rest) =>
adamc@328:                         [[nm] ~ rest] =>
adamc@328:                         fn r1 r2 => f [nm] [t] [rest] r1.nm r2.nm (acc (r1 -- nm) (r2 -- nm)))
adamc@328:                 (fn _ _ => i)