[Haskell-cafe] Bug or feature with -XFlexibleContects?

Hi, I noticed something odd yesterday. I had a function of this type: divByGeneric :: (Integral a, MonadError (DivByError a) m) => a -> [a] -> m [a] If I left off the type signature, ghci (with no command-line parameters) would load the file just fine, and :t would give this same type back. But if I put the type signature in there -- even an exact cut and paste from ghci's :t -- it would complain that it needs -XFlexibleContexts. It seems odd to me that ghci can infer a type that is illegal for the way it was run. Thoughts? This is GHC 6.8.2, BTW. -- John