transformers: remove instance MonadFix ExceptT and ErrorT

[Felipe Lessa]

On 12-08-2014 12:10, Bertram Felgenhauer wrote:
>   ghci> runExcept (mfix (\v -> throwE v))
>   Left *** Exception: mfix ExceptT: Left

Perhaps the error message should be changed to something more
descriptive, then.  For example: "mfix ExceptT: Fixpoint computation
depends on an exception".

-- 
Felipe.

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