let "cabal configure -fSomeFlag" produce error for undeclared flags
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cabal-install: other
old-milestone: ⊥
type: enhancement
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Beschreibung
(Imported from [Trac #947](http://hackage.haskell.org/trac/hackage/ticket/947), reported by Oblosys on 2012-04-27)
Typos in flags can lead to confusing problems, especially with large projects that take a long time to build. A simple check could be quite useful:
~> hconfigure -fNonExistentFlag -fSomeFlag
cabal: undeclared flag 'NonExistentFlag'. Declared flags are:
ExistentFlag, SomeFlag
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