Spelling correction in LANGUAGE pragmas

Somewhat in the spirit of my perenially-ignored #2442 (closed) ticket:

{-# LANGUAGE ExistientialQuantification #-}

Should results in:

readFail046.hs:1:14:
    Unsupported extension: ExistientialQuantification
    Perhaps you meant `ExistentialQuantification' or `NoExistentialQuantification'

Because I always say RecordWildCards instead of RecordWildcards, and can't remember how to spell "existential" :-)

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Trac field	Value
Version	6.12.1
Type	FeatureRequest
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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