diff -r 4bb9e72e1a41 -r 7fdaa05a69a1 test/maps_test.cc
--- a/test/maps_test.cc	Wed Sep 12 17:25:48 2012 +0200
+++ b/test/maps_test.cc	Thu Sep 13 11:56:19 2012 +0200
@@ -103,6 +103,7 @@
     checkConcept<ReadWriteMap<A,B>, NullMap<A,B> >();
     NullMap<A,B> map1;
     NullMap<A,B> map2 = map1;
+    ignore_unused_variable_warning(map2);
     map1 = nullMap<A,B>();
   }
 
@@ -113,11 +114,15 @@
     ConstMap<A,B> map1;
     ConstMap<A,B> map2 = B();
     ConstMap<A,B> map3 = map1;
+    ignore_unused_variable_warning(map2,map3);
+
     map1 = constMap<A>(B());
     map1 = constMap<A,B>();
     map1.setAll(B());
     ConstMap<A,C> map4(C(1));
     ConstMap<A,C> map5 = map4;
+    ignore_unused_variable_warning(map5);
+
     map4 = constMap<A>(C(2));
     map4.setAll(C(3));
 
@@ -138,6 +143,8 @@
     checkConcept<ReadMap<A,A>, IdentityMap<A> >();
     IdentityMap<A> map1;
     IdentityMap<A> map2 = map1;
+    ignore_unused_variable_warning(map2);
+
     map1 = identityMap<A>();
 
     checkConcept<ReadMap<double,double>, IdentityMap<double> >();
@@ -197,7 +204,9 @@
     typedef ComposeMap<DoubleMap, ReadMap<B,A> > CompMap;
     checkConcept<ReadMap<B,double>, CompMap>();
     CompMap map1 = CompMap(DoubleMap(),ReadMap<B,A>());
+    ignore_unused_variable_warning(map1);
     CompMap map2 = composeMap(DoubleMap(), ReadMap<B,A>());
+    ignore_unused_variable_warning(map2);
 
     SparseMap<double, bool> m1(false); m1[3.14] = true;
     RangeMap<double> m2(2); m2[0] = 3.0; m2[1] = 3.14;
@@ -210,7 +219,9 @@
     typedef CombineMap<DoubleMap, DoubleMap, std::plus<double> > CombMap;
     checkConcept<ReadMap<A,double>, CombMap>();
     CombMap map1 = CombMap(DoubleMap(), DoubleMap());
+    ignore_unused_variable_warning(map1);
     CombMap map2 = combineMap(DoubleMap(), DoubleMap(), std::plus<double>());
+    ignore_unused_variable_warning(map2);
 
     check(combineMap(constMap<B,int,2>(), identityMap<B>(), &binc)[B()] == 3,
           "Something is wrong with CombineMap");
@@ -222,11 +233,15 @@
     checkConcept<ReadMap<A,B>, FunctorToMap<F> >();
     FunctorToMap<F> map1;
     FunctorToMap<F> map2 = FunctorToMap<F>(F());
+    ignore_unused_variable_warning(map2);
+
     B b = functorToMap(F())[A()];
+    ignore_unused_variable_warning(b);
 
     checkConcept<ReadMap<A,B>, MapToFunctor<ReadMap<A,B> > >();
     MapToFunctor<ReadMap<A,B> > map =
       MapToFunctor<ReadMap<A,B> >(ReadMap<A,B>());
+    ignore_unused_variable_warning(map);
 
     check(functorToMap(&func)[A()] == 3,
           "Something is wrong with FunctorToMap");
@@ -244,7 +259,10 @@
     checkConcept<ReadMap<double,double>,
       ConvertMap<ReadMap<double, int>, double> >();
     ConvertMap<RangeMap<bool>, int> map1(rangeMap(1, true));
+    ignore_unused_variable_warning(map1);
     ConvertMap<RangeMap<bool>, int> map2 = convertMap<int>(rangeMap(2, false));
+    ignore_unused_variable_warning(map2);
+
   }
 
   // ForkMap