ghci can't load file whose name contains non-ASCII chars?

http://thread.gmane.org/gmane.comp.lang.haskell.cafe/97465

The file name contains O-umlaut, and the OS handles it fine, but ghci does not like it (although it accepts umlauts in the contents of the file (UTF-8) e.g., as a module name)

$ cat fÖÖbar.hs 
main = print $ product [1..100]

$ ghci fÖÖbar.hs 
GHCi, version 7.4.1: http://www.haskell.org/ghc/  :? for help
Loading package ghc-prim ... linking ... done.
Loading package integer-gmp ... linking ... done.
Loading package base ... linking ... done.

<no location info>: can't find file: f??bar.hs
Failed, modules loaded: none.

this is on a standard ubuntu install (11.10 and 11.04) with

$ locale
LANG=en_US.UTF-8
LANGUAGE=
LC_CTYPE="en_US.UTF-8"
...

$ ghc --version
The Glorious Glasgow Haskell Compilation System, version 7.4.1
$ uname -a
Linux octopus 3.0.0-16-generic #29-Ubuntu SMP Tue Feb 14 12:48:51 UTC 2012
x86_64 x86_64 x86_64 GNU/Linux

Trac metadata

Trac field	Value
Version	7.4.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	GHCi
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture