Note the "Safety Inferred" seal of approval on the upper right hand corner of the hackage package http://hackage.haskell.org/packages/archive/lens-family-core/0

Note the "Safety Inferred" seal of approval on the upper right hand corner of the hackage package http://hackage.haskell.org/packages/archive/lens-family-core/0.0.0/doc/html/Lens-Family.html http://hackage.haskell.org/packages/archive/lens-family-core... This means it survives a recursive check of dependencies that precludes that kind of nonsense.