failed compilation with ghc 6.12 : no mask function

[vincenthz]

while trying to install new packages on an old ppc target with ghc 6.12, i came across this:

[14 of 23] Compiling Test.Framework.Core ( Test/Framework/Core.hs, dist/build/Test/Framework/Core.o )
[15 of 23] Compiling Test.Framework.Providers.API ( Test/Framework/Providers/API.hs, dist/build/Test/Framework/Providers/API.o )
[16 of 23] Compiling Test.Framework.Runners.Core ( Test/Framework/Runners/Core.hs, dist/build/Test/Framework/Runners/Core.o )

Test/Framework/Runners/Core.hs:15:26:
    Module `Control.Exception' does not export `mask'
Failed to install test-framework-0.8

i haven't look if it's easy or not to fix.