You may use the optics package instead. It is a replacement for the lens octaves with a focus on good docs and better error messages: https://hackage.haskell.o

You may use the optics package instead. It is a replacement for the lens octaves with a focus on good docs and better error messages: https://hackage.haskell.org/package/optics-0.1/docs/Optics.html https://hackage.haskell.org/package/optics-0.1/docs/Optics.h...