ghc --make deletes source file in Windows

I’ve a very strange problem that may be related to my 
computer. 

If I compile a file with ghc -–make from outside the 
directory where the source file is, using \ as the path 
separator, the file gets deleted. (Using Windows 2000 
and GHC 6.0)

For example:

F:\>cat > project\test.hs
module Main where
main = putStrLn "Hello"

F:\>ghc --make project/test.hs
Chasing modules from: project/test.hs
Compiling Main             ( project/test.hs, 
project/test.o )
Linking ...

F:\>ghc --make project\test.hs
Chasing modules from: project\test.hs
Skipping  Main             ( project/test.hs, project/test.o )
Linking ...

F:\>ghc --make project\test.hs
Chasing modules from: project\test.hs
ghc: can't find file `project\test.hs'

And indeed the file is no longer there!

Trac metadata

Trac field	Value
Version	6.0
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	ResolvedFixed
Component	Compiler
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture

changed weight to 5

added Tbug Trac import labels

closed

Logged In: YES 
user_id=50165

Fixed by Sigbjorn, by normalising command-line argument path 
names.

mentioned in commit 28c706da

mentioned in commit 70b40d9e

mentioned in commit 077bf477

mentioned in commit d0011409

added Pnormal label

mentioned in commit 5ccfd2ef

mentioned in commit 78723a60

mentioned in commit 386c218b

mentioned in commit 5ac539e6

mentioned in commit fa4a62e2

mentioned in commit bb183e36

mentioned in commit be1fc7df