Why is System.Posix.Error in unix?

Hi all, I get the feeling I must be missing something, but why is System.Posix.Error in the unix package? It looks to me like it just calls things in the base package, and it works on Windows as far as I can see: $ ghci System/Posix/Error.hs [...] Loading package base ... linking ... done. [1 of 1] Compiling System.Posix.Error ( System/Posix/Error.hs, interpreted ) Ok, modules loaded: System.Posix.Error. *System.Posix.Error> throwErrnoPath "foo" "bar" *** Exception: bar: foo: failed (No error) *System.Posix.Error> Is there a reason not to move this, perhaps renaming it in the process, to the base package (or possibly elsewhere in the future, but in the short term I might want to use it in base)? Thanks Ian