Warn about unused flags in Cabal file
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Cabal: other
old-milestone: ⊥
type: enhancement
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描述
(Imported from [Trac #763](http://hackage.haskell.org/trac/hackage/ticket/763), reported by @tibbe on 2010-11-11)
Cabal should output a warning during configure if a flag is defined but never used. I almost forgot to delete an old flag due to removing its use sites but not its definition.
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