[Haskell-cafe] Request: warn about language extensions that are not used

[Martijn van Steenbergen]

I'd love that. I've been wanting this for a while, at least 
subconsciously. Thanks for making it explicit. :-)


Peter Verswyvelen wrote:
> When I put
> 
> {-# OPTIONS_GHC -Wall -Werror #-}
> 
> in my source file, I don't get compiler (GHC) warnings about redundant 
> language extensions that I enabled.
> 
> It would be nice if the compiler gave warnings about this, since after 
> refactoring, some language extensions might not be needed anymore, and 
> hence should be removed since fewer language extensions mean more stable 
> and portable code no?
> 
> What do you think?
> 
> 
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