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Simon Peyton Jones authored
In tidying up the flattener I introduced an error that no regression test caught, giving rise to Trac #8978, #8979. It shows up if you have a type synonym whose RHS mentions type functions, such sas type family F a type T a = (F a, a) -- This synonym isn't properly flattened The fix is easy, but sadly the bug is in the released GHC 7.8.1
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