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diff --git a/trunk/TAO/tests/IDL_Test/typedef.idl b/trunk/TAO/tests/IDL_Test/typedef.idl
new file mode 100644
index 00000000000..95efd07bc91
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+++ b/trunk/TAO/tests/IDL_Test/typedef.idl
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+// $Id$
+
+// ============================================================================
+//
+// = LIBRARY
+//    TAO/tests/IDL_Test
+//
+// = FILENAME
+//    typedef.idl
+//
+// = DESCRIPTION
+//    This file contains examples of IDL code that has 
+//    caused problems in the past for the TAO IDL
+//    compiler. This test is to make sure the problems
+//    stay fixed.
+//
+// = AUTHORS
+//    Jeff Parsons <parsons@cs.wustl.edu> and TAO users.
+//
+// ============================================================================
+
+
+// Must keep unaliasing until all levels of typedef
+// are removed.
+
+// This is also a test of arrays of arrays. Once 
+// upon a time, the generated CDR operators of such 
+// animals wouldn't compile on all platforms.
+
+typedef char TAO_A5[5];
+
+typedef TAO_A5 TAO_C5;
+
+typedef TAO_C5 TAO_G5;
+
+typedef TAO_G5 TAO_J5;
+
+typedef TAO_J5 TAO_M5[5];
+
+typedef TAO_M5 TAO_R5;
+
+typedef TAO_R5 TAO_V5;
+
+typedef TAO_V5 TAO_Z5[5];
+
+// Need to make sure that the arg traits specializations for each
+// typedef has a unique #ifndef guard.
+module TestModule 
+{
+ 	typedef string<32> typedef_1;	
+	typedef string<32> typedef_2;
+
+	interface TestInterface 
+	{		
+		void set_typedef_1 (in TestModule::typedef_1 typ1);
+    void set_typedef_2 (in TestModule::typedef_2 typ2);
+  };	
+};
+
+// Caught failure of arg traits generation for the 2nd typedef.
+module bug_2124
+{   
+   typedef string<10> MyString;
+   typedef MyString OtherString;
+
+   interface Foo
+   {
+      void op1 (in MyString s);
+      void op2 (in OtherString s);
+   };
+};
+
+// Caught a case where the #ifdef guards were different, but the
+// generated string typename was the same.
+module bug_2122
+{
+   module One
+   {
+      typedef string<40> MyString;
+
+      interface Whatever
+      {
+         void someOp (in MyString s);
+      };
+   };
+
+   module Two
+   {
+      typedef string<100> MyString; // Same name, different size!
+
+      interface WhoCares
+      {
+         void someOp (in MyString s);
+      };
+   };
+
+   module Three
+   {
+      typedef string<100> MyString; // Same name, same size!
+
+      interface WhoCares
+      {
+         void someOp (in MyString s);
+      };
+   };
+};
+
+// An anonymous string of the same bound will be found in
+// another IDL file not included in this one (anonymous.idl).
+// The typecode for the anonymous string should not give us
+// 'already found' link errors.
+module First
+{
+  typedef string<32> FirstString;
+};
+
+
+