diff --git a/test/optional_test_fail4.cpp b/test/optional_test_fail4.cpp
deleted file mode 100644
index c242315..0000000
--- a/test/optional_test_fail4.cpp
+++ /dev/null
@@ -1,29 +0,0 @@
-// (C) 2003, Fernando Luis Cacciola Carballal.
-//
-// This material is provided "as is", with absolutely no warranty expressed
-// or implied. Any use is at your own risk.
-//
-// Permission to use or copy this software for any purpose is hereby granted
-// without fee, provided the above notices are retained on all copies.
-// Permission to modify the code and to distribute modified code is granted,
-// provided the above notices are retained, and a notice that the code was
-// modified is included with the above copyright notice.
-//
-// You are welcome to contact the author at:
-//  fernando_cacciola@hotmail.com
-//
-#include "boost/optional.hpp"
-
-//
-// THIS TEST SHOULD FAIL TO COMPILE
-//
-void test_no_implicit_conversion()
-{
-  boost::optional<int> opt(1) ;
-
-  // You can compare against 0 or against another optional<>,
-  // but not against another value
-  if ( opt == 1 ) ;
-}
-
-
diff --git a/test/optional_test_fail5a.cpp b/test/optional_test_fail5a.cpp
deleted file mode 100644
index 771ef73..0000000
--- a/test/optional_test_fail5a.cpp
+++ /dev/null
@@ -1,28 +0,0 @@
-// (C) 2003, Fernando Luis Cacciola Carballal.
-//
-// This material is provided "as is", with absolutely no warranty expressed
-// or implied. Any use is at your own risk.
-//
-// Permission to use or copy this software for any purpose is hereby granted
-// without fee, provided the above notices are retained on all copies.
-// Permission to modify the code and to distribute modified code is granted,
-// provided the above notices are retained, and a notice that the code was
-// modified is included with the above copyright notice.
-//
-// You are welcome to contact the author at:
-//  fernando_cacciola@hotmail.com
-//
-#include<string>
-
-#include "boost/optional.hpp"
-
-//
-// THIS TEST SHOULD FAIL TO COMPILE
-//
-void test_no_unsupported_conversion()
-{
-  boost::optional<int> opt1(1) ;
-  boost::optional< std::string > opt2( opt1 ) ; // Cannot convert from "int" to "std::string"
-}
-
-
diff --git a/test/optional_test_fail5b.cpp b/test/optional_test_fail5b.cpp
deleted file mode 100644
index 1d00d2b..0000000
--- a/test/optional_test_fail5b.cpp
+++ /dev/null
@@ -1,29 +0,0 @@
-// (C) 2003, Fernando Luis Cacciola Carballal.
-//
-// This material is provided "as is", with absolutely no warranty expressed
-// or implied. Any use is at your own risk.
-//
-// Permission to use or copy this software for any purpose is hereby granted
-// without fee, provided the above notices are retained on all copies.
-// Permission to modify the code and to distribute modified code is granted,
-// provided the above notices are retained, and a notice that the code was
-// modified is included with the above copyright notice.
-//
-// You are welcome to contact the author at:
-//  fernando_cacciola@hotmail.com
-//
-#include<string>
-
-#include "boost/optional.hpp"
-
-//
-// THIS TEST SHOULD FAIL TO COMPILE
-//
-void test_no_unsupported_conversion()
-{
-  boost::optional<int> opt1(1) ;
-  boost::optional< std::string > opt2 ;
-  opt2 = opt1 ; // Cannot convert from "int" to "std::string"
-}
-
-