Index: tests/BooCompiler.Tests/ClrExtensionsIntegrationTestFixture.cs
===================================================================
--- tests/BooCompiler.Tests/ClrExtensionsIntegrationTestFixture.cs	(Revision 3072)
+++ tests/BooCompiler.Tests/ClrExtensionsIntegrationTestFixture.cs	(Arbeitskopie)
@@ -16,8 +16,13 @@
 		public void clrextensions_2()
 		{
 			RunCompilerTestCase(@"clrextensions-2.boo");
-		}
-		
+		}
+
+        [Test]
+        public void clrextensions_3()
+        {
+            RunCompilerTestCase( @"clrextensions-3.boo" );
+        }
 
 		override protected string GetRelativeTestCasesPath()
 		{
Index: tests/testcases/integration/clrextensions/clrextensions-3.boo
===================================================================
--- tests/testcases/integration/clrextensions/clrextensions-3.boo	(Revision 0)
+++ tests/testcases/integration/clrextensions/clrextensions-3.boo	(Revision 0)
@@ -0,0 +1,33 @@
+"""
+string
+"""
+import System
+import Boo.Lang.Compiler.MetaProgramming
+
+extensionAttribute = Type.GetType("System.Runtime.CompilerServices.ExtensionAttribute, System.Core, Version=3.5.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089")
+if extensionAttribute is null:
+	print "string"
+	return
+
+extensionAssembly = extensionAttribute.Assembly
+	
+library = [|
+	namespace ClrExtensions
+	
+	class Bar:
+		def Foo(o as object):
+			print 'object'
+|]
+
+code = [|
+	import ClrExtensions
+
+	[System.Runtime.CompilerServices.ExtensionAttribute]
+	def Foo(bar as Bar,s as string):
+		print 'string'
+
+	b = Bar();
+	b.Foo('test')
+|]
+compile(code, compile(library, extensionAssembly), extensionAssembly).EntryPoint.Invoke(null, (null,))
+