[xmonad] XMonadContrib -Werror build currently broken with GHC 6.10

[Gwern Branwen]

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....
[101 of 140] Compiling XMonad.Config.PlainConfig (
XMonad/Config/PlainConfig.hs, dist/build/XMonad/Config/PlainConfig.o )

XMonad/Config/PlainConfig.hs:235:9:
    Warning: orphan instance: instance Error [(Integer, String)]

Oops.

I ran into this on the record-test. So do we suggest 6.10 developers
just use --no-test or what?

- --
gwern
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