--- a/src/elaborate.sml	Sun Apr 11 13:18:32 2010 -0400
+++ b/src/elaborate.sml	Sun Apr 11 14:11:17 2010 -0400
@@ -2237,14 +2237,21 @@
       | L.SgiTable (x, c, pe, ce) =>
         let
             val cstK = (L'.KRecord (L'.KRecord (L'.KUnit, loc), loc), loc)
-            val x' = x ^ "_hidden_constraints"
-            val (env', hidden_n) = E.pushCNamed env x' cstK NONE
-            val hidden = (L'.CNamed hidden_n, loc)
 
             val (c', ck, gs') = elabCon (env, denv) c
             val pkey = cunif (loc, cstK)
             val visible = cunif (loc, cstK)
-            val uniques = (L'.CConcat (visible, hidden), loc)
+            val (env', ds, uniques) =
+                case (#1 pe, #1 ce) of
+                    (L.EVar (["Basis"], "no_primary_key", _), L.EVar (["Basis"], "no_constraint", _)) =>
+                    let
+                        val x' = x ^ "_hidden_constraints"
+                        val (env', hidden_n) = E.pushCNamed env x' cstK NONE
+                        val hidden = (L'.CNamed hidden_n, loc)
+                    in
+                        (env', [(L'.SgiConAbs (x', hidden_n, cstK), loc)], (L'.CConcat (visible, hidden), loc))
+                    end
+                  | _ => (env, [], visible)
 
             val ct = tableOf ()
             val ct = (L'.CApp (ct, c'), loc)
@@ -2272,8 +2279,7 @@
             checkCon env' pe' pet pst;
             checkCon env' ce' cet cst;
 
-            ([(L'.SgiConAbs (x', hidden_n, cstK), loc),
-              (L'.SgiVal (x, n, ct), loc)], (env', denv, gs''' @ gs'' @ gs' @ gs))
+            (ds @ [(L'.SgiVal (x, n, ct), loc)], (env', denv, gs''' @ gs'' @ gs' @ gs))
         end
 
       | L.SgiStr (x, sgn) =>