Re: [Haskell-cafe] Safe lens?

Hi I believe the reason is that it uses TemplateHaskell for automatic derivation of labels. And TemplateHaskell is of course unsafe, since it could convert your code into something entirely different. Best regards, Petr Pudlak 2012/10/29 Greg Fitzgerald :

Why are getters from the 'lens' package unsafe? Is there a subset like Data.Label.Pure from 'fclabels' that can be imported safely?

$ cat a.hs {-# LANGUAGE Safe #-}

import Control.Lens.Getter

main = print 123

$ runghc a.hs

a.hs:3:1: Control.Lens.Getter: Can't be safely imported! The module itself isn't safe.

Thanks, Greg

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