When a "non-exhaustive pattern"-error occurs, output the arguments (if possible)

For Haskell-beginners like me, "non-exhaustive pattern"-errors occur rather often and they can take some time to fix. While it is obvious that one has made a critical mistake when writing a function, I don't think adding some debugging help would certainly not be bad. I know that this feature only really makes sense when working with types that are instances of Show, but then again beginners find themselves working with these types.

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Trac field	Value
Version	7.10.2
Type	FeatureRequest
TypeOfFailure	OtherFailure
Priority	lowest
Resolution	Unresolved
Component	Compiler (Debugging)
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