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diff --git a/src/boost/libs/xpressive/test/test_dynamic_grammar.cpp b/src/boost/libs/xpressive/test/test_dynamic_grammar.cpp
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+++ b/src/boost/libs/xpressive/test/test_dynamic_grammar.cpp
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+//////////////////////////////////////////////////////////////////////////////
+// test_dynamic_grammar.cpp
+//
+//  (C) Copyright Eric Niebler 2004.
+//  Use, modification and distribution are subject to 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)
+
+/*
+ Revision history:
+   5 March 2007 : Initial version.
+*/
+
+// defining this causes regex_impl objects to be counted, allowing us to detect
+// leaks portably.
+#define BOOST_XPRESSIVE_DEBUG_CYCLE_TEST
+
+#include <boost/xpressive/xpressive.hpp>
+#include <boost/test/unit_test.hpp>
+
+void test_dynamic_grammar()
+{
+    using namespace boost::xpressive;
+
+    {
+        sregex expr;
+        {
+            sregex_compiler compiler;
+            regex_constants::syntax_option_type x = regex_constants::ignore_white_space;
+
+                   compiler.compile( "(? $group  = ) \\( (? $expr ) \\) ", x);
+                   compiler.compile( "(? $factor = ) \\d+ | (? $group ) ", x);
+                   compiler.compile( "(? $term   = ) (? $factor ) (?: \\* (? $factor ) | / (? $factor ) )* ", x);
+            expr = compiler.compile( "(? $expr   = ) (? $term )   (?: \\+ (? $term )   | - (? $term )   )* ", x);
+        }
+
+        std::string str("foo 9*(10+3) bar");
+        smatch what;
+
+        if(regex_search(str, what, expr))
+        {
+             BOOST_CHECK_EQUAL(what[0].str(), "9*(10+3)");
+             BOOST_CHECK_EQUAL((*what.nested_results().begin())[0].str(), "9*(10+3)");
+             BOOST_CHECK_EQUAL((*(*what.nested_results().begin()).nested_results().begin())[0].str(), "9");
+             BOOST_CHECK_EQUAL((*++(*what.nested_results().begin()).nested_results().begin())[0].str(), "(10+3)");
+        }
+        else
+        {
+            BOOST_ERROR("regex_search test 1 failed");
+        }
+    }
+
+    // Test that all regex_impl instances have been cleaned up correctly
+    BOOST_CHECK_EQUAL(0, detail::regex_impl<std::string::const_iterator>::instances);
+}
+
+void test_dynamic_grammar2()
+{
+    using namespace boost::xpressive;
+
+    {
+        sregex expr;
+        {
+            sregex_compiler compiler;
+            regex_constants::syntax_option_type x = regex_constants::ignore_white_space;
+
+            compiler["group"]   = compiler.compile( "\\( (? $expr ) \\) ", x);
+            compiler["factor"]  = compiler.compile( "\\d+ | (? $group ) ", x);
+            compiler["term"]    = compiler.compile( "(? $factor ) (?: \\* (? $factor ) | / (? $factor ) )* ", x);
+            compiler["expr"]    = compiler.compile( "(? $term )   (?: \\+ (? $term )   | - (? $term )   )* ", x);
+
+            expr = compiler["expr"];
+        }
+
+        std::string str("foo 9*(10+3) bar");
+        smatch what;
+
+        if(regex_search(str, what, expr))
+        {
+             BOOST_CHECK_EQUAL(what[0].str(), "9*(10+3)");
+             BOOST_CHECK_EQUAL((*what.nested_results().begin())[0].str(), "9*(10+3)");
+             BOOST_CHECK_EQUAL((*(*what.nested_results().begin()).nested_results().begin())[0].str(), "9");
+             BOOST_CHECK_EQUAL((*++(*what.nested_results().begin()).nested_results().begin())[0].str(), "(10+3)");
+        }
+        else
+        {
+            BOOST_ERROR("regex_search test 2 failed");
+        }
+    }
+
+    // Test that all regex_impl instances have been cleaned up correctly
+    BOOST_CHECK_EQUAL(0, detail::regex_impl<std::string::const_iterator>::instances);
+}
+
+using namespace boost;
+using namespace unit_test;
+
+///////////////////////////////////////////////////////////////////////////////
+// init_unit_test_suite
+//
+test_suite* init_unit_test_suite( int argc, char* argv[] )
+{
+    test_suite *test = BOOST_TEST_SUITE("testing dynamic grammars");
+    test->add(BOOST_TEST_CASE(&test_dynamic_grammar));
+    test->add(BOOST_TEST_CASE(&test_dynamic_grammar2));
+    return test;
+}