Fixes for concept checking; use destructors for checking classes, misc cleanup.

[SVN r33862]

old_concept_function_fail.cpp

@@ -0,0 +1,23 @@
+// (C) Copyright Jeremy Siek 2000.
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+#ifdef NDEBUG
+#  undef NDEBUG
+#endif
+
+#include "old_concepts.hpp"
+
+// This file verifies that concepts written the old way still catch
+// errors in function context.  This is not expected to work on
+// compilers without SFINAE support.
+
+struct foo { };
+
+int
+main()
+{
+    boost::function_requires< old::EqualityComparableConcept<foo> >();
+    return 0;
+}