--- a/src/expl_util.sml	Sat Aug 16 14:36:17 2008 -0400
+++ b/src/expl_util.sml	Sat Aug 16 14:45:23 2008 -0400
@@ -57,6 +57,11 @@
                            (KRecord k', loc))
 
               | KUnit => S.return2 kAll
+
+              | KTuple ks =>
+                S.map2 (ListUtil.mapfold mfk ks,
+                        fn ks' =>
+                           (KTuple ks', loc))
     in
         mfk
     end
@@ -148,6 +153,16 @@
                                        (CFold (k1', k2'), loc)))
 
               | CUnit => S.return2 cAll
+
+              | CTuple cs =>
+                S.map2 (ListUtil.mapfold (mfc ctx) cs,
+                        fn cs' =>
+                           (CTuple cs', loc))
+
+              | CProj (c, n) =>
+                S.map2 (mfc ctx c,
+                        fn c' =>
+                           (CProj (c', n), loc))
     in
         mfc
     end