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con idT = fn t :: Type => t
con record = fn t :: {Type} => $t
con mapTT = fn f :: Type -> Type => fold (fn nm t acc => [nm] ~ acc =>
[nm = f t] ++ acc) []
val compose : t1 ::: Type -> t2 ::: Type -> t3 ::: Type
-> (t2 -> t3) -> (t1 -> t2) -> (t1 -> t3)
val txt : t ::: Type -> ctx ::: {Unit} -> use ::: {Type} -> show t -> t
-> xml ctx use []
val foldTR2 : tf1 :: (Type -> Type) -> tf2 :: (Type -> Type) -> tr :: ({Type} -> Type)
-> (nm :: Name -> t :: Type -> rest :: {Type} -> [nm] ~ rest
-> tf1 t -> tf2 t -> tr rest -> tr ([nm = t] ++ rest))
-> tr [] -> r :: {Type} -> $(mapTT tf1 r) -> $(mapTT tf2 r) -> tr r
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