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

Thanks Conal. For people interested, here's the ticket. http://hackage.haskell.org/trac/ghc/ticket/3085 Martijn Van Steenbergen indirectly revealed a feature request to the feature request feature of the feature database :-) Okay, I'll stop the nonsense: it would be nice if the community could rate the popularity of a feature request, which Martijn now just did by adding a comment. On Thu, Mar 12, 2009 at 3:12 PM, Conal Elliott wrote:

Thanks Peter. I'd love to have this feature also. I go back every so often and try removing each of the extensions listed in my LANGUAGE pragma. Didn't occur to me that the compiler could be doing it for me. Regards, - Conal

2009/3/11 Peter Verswyvelen

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Okay, I submitted it as a GHC feature request. Thanks for the feedback. On Wed, Mar 11, 2009 at 5:16 PM, Creighton Hogg wrote:

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2009/3/11 Peter Verswyvelen :

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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?

So you mean something like if you put {-# LANGUAGE GeneralizedNewtypeDeriving #-} in a file, but never do newtype deriving, it would warn you?

I have no idea how hard that'd be to implement, but that sounds kind of cool. Useful for both refactoring and when you've inherited old code.

Cheers, C

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