#3085: warn about language extensions that are not used
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Reporter: PVerswyvelen | Owner:
Type: feature request | Status: new
Priority: normal | Component: Compiler
Version: 6.10.1 | Severity: normal
Keywords: warnings extensions language | Testcase:
Os: Unknown/Multiple | Architecture: Unknown/Multiple
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When I put
`{-# OPTIONS_GHC -Wall -Werror #-}`
in my source file, I don't get compiler warnings about redundant language
extensions that I enabled in that file.
For example if I write
`{-# LANGUAGE GeneralizedNewtypeDeriving #-}`
in the file, but I never do newtype deriving, the compiler could give me a
warning.
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?
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3085>
GHC <http://www.haskell.org/ghc/>
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