Sometimes the StableName library gives different values for the samr function: Sometines gives two alternate values. I checked it in ghc-6.10.1 under windows and in ghc-6.8.2 under Linux:

This is an example

Prelude> System.Mem.StableName.hashStableName.System.IO.Unsafe.unsafePerformIO $

 System.Mem.StableName.makeStableName (*)

15

Prelude> System.Mem.StableName.hashStableName.System.IO.Unsafe.unsafePerformIO $

 System.Mem.StableName.makeStableName (*)

14

Prelude> System.Mem.StableName.hashStableName.System.IO.Unsafe.unsafePerformIO $

 System.Mem.StableName.makeStableName (*)

15

Prelude> System.Mem.StableName.hashStableName.System.IO.Unsafe.unsafePerformIO $

 System.Mem.StableName.makeStableName (*)

14