--- a/lib/ur/monad.ur	Thu Oct 14 11:54:54 2010 -0400
+++ b/lib/ur/monad.ur	Sun Oct 17 13:26:11 2010 -0400
@@ -94,13 +94,11 @@
      fl
 
 fun appR2 [K] [m] (_ : monad m) [tf1 :: K -> Type] [tf2 :: K -> Type]
-           (f : nm :: Name -> t :: K -> rest :: {K}
-                -> [[nm] ~ rest] =>
-            tf1 t -> tf2 t -> m unit)
+           (f : nm :: Name -> t :: K -> tf1 t -> tf2 t -> m unit)
            [r ::: {K}] (fl : folder r) =
     @Top.fold [fn r :: {K} => $(map tf1 r) -> $(map tf2 r) -> m unit]
      (fn [nm :: Name] [t :: K] [rest :: {K}] [[nm] ~ rest] acc r1 r2 =>
          acc (r1 -- nm) (r2 -- nm);
-         f [nm] [t] [rest] ! r1.nm r2.nm)
+         f [nm] [t] r1.nm r2.nm)
      (fn _ _ => return ())
      fl