obtained gcc-4.6.4.tar.bz2 from upstream website;upstream

verified gcc-4.6.4.tar.bz2.sig;
imported gcc-4.6.4 source tree from verified upstream tarball.

downloading a git-generated archive based on the 'upstream' tag
should provide you with a source tree that is binary identical
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if you have obtained the source via the command 'git clone',
however, do note that line-endings of files in your working
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1 files changed, 45 insertions, 0 deletions

diff --git a/gcc/testsuite/gnat.dg/gen_disp.adb b/gcc/testsuite/gnat.dg/gen_disp.adb
new file mode 100644
index 000000000..736b9cdc0
--- /dev/null
+++ b/gcc/testsuite/gnat.dg/gen_disp.adb
@@ -0,0 +1,45 @@
+--  { dg-do compile }
+with Ada.Containers.Ordered_Maps;
+with Ada.Tags.Generic_Dispatching_Constructor;
+package body gen_disp is
+   
+   use type Ada.Tags.Tag;
+   
+   function "<" (L, R : in Ada.Tags.Tag) return Boolean is
+   begin
+      return Ada.Tags.External_Tag (L) < Ada.Tags.External_Tag (R);
+   end "<";
+   
+   package Char_To_Tag_Map is new Ada.Containers.Ordered_Maps (
+      Key_Type => Character,
+      Element_Type => Ada.Tags.Tag,
+      "<" => "<",
+      "=" => Ada.Tags. "=");
+      
+   package Tag_To_Char_Map is new Ada.Containers.Ordered_Maps (
+      Key_Type => Ada.Tags.Tag,
+      Element_Type => Character,
+      "<" => "<",
+      "=" => "=");
+      
+   use type Char_To_Tag_Map.Cursor;
+   use type Tag_To_Char_Map.Cursor;
+   
+   Char_To_Tag : Char_To_Tag_Map.Map;
+   Tag_To_Char : Tag_To_Char_Map.Map;
+   
+   function Get_Object is new
+     Ada.Tags.Generic_Dispatching_Constructor
+        (Root_Type, Ada.Streams.Root_Stream_Type'Class, Root_Type'Input);
+        
+   function Root_Type_Class_Input
+     (S    : not null access Ada.Streams.Root_Stream_Type'Class)
+      return Root_Type'Class 
+   is 
+      External_Tag : constant Character := Character'Input (S);
+      C : constant Char_To_Tag_Map.Cursor := Char_To_Tag.Find (External_Tag);
+   begin
+
+      return Get_Object (Char_To_Tag_Map.Element (C), S);
+   end Root_Type_Class_Input;
+end gen_disp;