fix for ghc 6.12 compatibility
fix for ghc 6.12 compatibility

Ignore-this: 9d55e3b418dee372790fa38e9263eaeb

darcs-hash:bdf4616d113ddc4ffc2fa192e3b943d4826c1cf3

dpwright/jhc,dpwright/jhc,dpwright/jhc,dpwright/jhc