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',
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1 files changed, 33 insertions, 0 deletions

diff --git a/gcc/testsuite/gnat.dg/loop_unchecked_conversion.adb b/gcc/testsuite/gnat.dg/loop_unchecked_conversion.adb
new file mode 100644
index 000000000..e87c415c5
--- /dev/null
+++ b/gcc/testsuite/gnat.dg/loop_unchecked_conversion.adb
@@ -0,0 +1,33 @@
+-- { dg-do compile }
+-- { dg-options "-gnatws -O" }
+
+with Unchecked_Conversion;
+
+package body loop_unchecked_conversion is
+
+   type Byte is mod 2**8;
+
+   type List is array (Natural range <>) of Byte;
+
+   subtype Integer_List is List (1 .. 4);
+
+   function Integer_Down is new
+     Unchecked_Conversion (Source => Integer, Target => Integer_List);
+
+   type Storage (Size : Integer) is
+      record
+         Data : List (1 .. Size);
+      end record;
+
+   type Storage_Pointer is access Storage;
+
+   The_Data_Storage : Storage_Pointer;
+
+   procedure slice is
+   begin
+      for I in 0 .. 1 loop
+         The_Data_Storage.Data (I+1 .. I+4) := Integer_Down (I);
+      end loop;
+   end;
+
+end loop_unchecked_conversion;