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<div name="messageBodySection">I'm going through a book on Haskell that is based on a ghc version between 7.8 and 8.0
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<div>I created a new project using the default settings and have a much more recent version of ghc installed</div>
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<div>How to I fall back to an earlier version?</div>
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<div>Using haskell stack on manjaro linux</div>
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Steve</div>
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