Should exhaustiveness testing be on by default?

Peter Hercek phercek at
Mon May 18 05:45:38 EDT 2009

Neil Mitchell wrote:
> I'm not a particular fan of exhaustiveness checking. It just
> encourages people to write:
> foo (Just 1) [x:xs] = important case
> foo _ _ = error "doh!"
> So now when the program crashes, instead of getting a precise and
> guaranteed correct error message, I get "doh!" - not particularly
> helpful for debugging
Is there some compile option to automatically annotate error call with 
its source
 code location (so that one dos not need to mention it in the string 


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