Document Safe Haskell restrictions on Generic instances

Authored by RyanGlScott on Sep 30 2016, 2:52 PM.

Description

Document Safe Haskell restrictions on Generic instances

Commit 578fbeca31dd3d755e24e910c3a7327f92bc4ee3 disallowed hand-written
Generic instances in Safe Haskell, but this wasn't documented anywhere.

Details