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

Sittampalam, Ganesh ganesh.sittampalam at credit-suisse.com
Thu Mar 12 10:29:05 EDT 2009

As I understand it the current scheme is that you vote for a bug by
adding yourself to the CC list.


From: haskell-cafe-bounces at haskell.org
[mailto:haskell-cafe-bounces at haskell.org] On Behalf Of Peter Verswyvelen
Sent: 12 March 2009 14:27
To: Conal Elliott
Cc: haskell mailing list
Subject: Re: [Haskell-cafe] Request: warn about language extensions that
are not used

Thanks Conal. 

For people interested, here's the ticket. 


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 <conal at conal.net> 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 <bugfact at gmail.com>

		Okay, I submitted it as a GHC feature request. Thanks
for the feedback. 

		On Wed, Mar 11, 2009 at 5:16 PM, Creighton Hogg
<wchogg at gmail.com> wrote:

			2009/3/11 Peter Verswyvelen <bugfact at gmail.com>:
			> 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 {-#
			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

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