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<no location info>:
Warning: -XGeneralizedNewtypeDeriving is not allowed in Safe Haskell; ignoring -XGeneralizedNewtypeDeriving
SafeLang07.hs:23:45:
Can't make a derived instance of `IntIso (Down a)':
`IntIso' is not a derivable class
Try -XGeneralizedNewtypeDeriving for GHC's newtype-deriving extension
In the newtype declaration for `Down'
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