diff --git a/src/lib/meta/function-erasure.hpp b/src/lib/meta/function-erasure.hpp
index b5299d186..460143baf 100644
--- a/src/lib/meta/function-erasure.hpp
+++ b/src/lib/meta/function-erasure.hpp
@@ -99,19 +99,18 @@ namespace typelist{
     {
       typedef bool (T::*ValidityCheck)()  const;
       typedef ValidityCheck _unspecified_bool_type;
-      ValidityCheck isValid;
-      
-      BoolCheckable() : isValid (&T::isValid) {}
       
       /** implicit conversion to "bool" */ 
       operator _unspecified_bool_type()  const   ///< never throws
         {
+          ValidityCheck isValid (&T::isValid);
           T const& obj = static_cast<T const&> (*this);
           return  (obj.*isValid)()? isValid : 0;
         }
       
       bool operator! ()  const ///< never throws
         {
+          ValidityCheck isValid (&T::isValid);
           T const& obj = static_cast<T const&> (*this);
           return !(obj.*isValid)();
         }
diff --git a/src/tool/try.cpp b/src/tool/try.cpp
index f4e6e1a4f..f2496df9c 100644
--- a/src/tool/try.cpp
+++ b/src/tool/try.cpp
@@ -49,7 +49,7 @@ using boost::format;
       bool
       isValid()  const
         {
-          return true;
+          return val_ % 2;
         }
       
     };
@@ -61,16 +61,20 @@ main (int, char**) //(int argc, char* argv[])
   {
     
     NOBUG_INIT;
-   
-    TestIt1 testrosteron (22);
     
-    bool boo = testrosteron;
+    for (int i=0; i<10; ++i)
+      {
+        TestIt1 testrosteron (i);
+        
+        if (testrosteron)
+          cout << "doIt \n";
+        if (!testrosteron)
+          cout << i << "\n";
+      }
+    cout << "size=" << sizeof(TestIt1) <<"\n";
+    
     
     cout <<  "\n.gulp.\n";
     
-    if (boo)
-      cout << "size=" << sizeof(TestIt1) <<"\n";
-    
-    
     return 0;
   }