ghc-6.2.1 panics while compiling darcs 1.0.3-rc1

[Louai Khanji]

Hi,
I get the following when compiling darcs:

--SNIP--
ghc  -cpp  -package parsec -package unix -O -funbox-strict-fields  -Wall 
-Werror -package util -I. -DHAVE_CURSES -DHAVE_CURL -c ColourPrinter.lhs
ghc  -cpp  -package parsec -package unix -O -funbox-strict-fields  -Wall 
-Werror -package util -I. -DHAVE_CURSES -DHAVE_CURL -no-auto-all 
-funfolding-use-threshold=20 -c SHA1.lhs
ghc-6.2.1: panic! (the `impossible' happened, GHC version 6.2.1):
        Prelude.read: no parse

Please report it as a compiler bug to glasgow-haskell-bugs at haskell.org,
or http://sourceforge.net/projects/ghc/.

make: *** [SHA1.o] Error 1
--SNIP--

I have searched with google but didn't find any similar problem.

This is on Gentoo, on amd64, with the ghc binary (not compiled from source).
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