[Haskell-cafe] Generalized Newtype Deriving not allowed in Safe Haskell

When compiling code with Generalized Newtype Deriving and the -fwarn-unsafe flag, I get -XGeneralizedNewtypeDeriving is not allowed in Safe Haskell This happens both in GHC 7.8 and GHC 7.10. I thought I remembered reading somewhere that GNTD is now part of the safe language? The GHC manual used to state that GNTD is not allowed in Safe Haskell: https://downloads.haskell.org/~ghc/7.6.3/docs/html/users_guide/safe-haskell.... But this language on GNTD not being part of the safe language was removed in the 7.8 manual: https://downloads.haskell.org/~ghc/7.8.2/docs/html/users_guide/safe-haskell.... The GHC release notes don't say anything about this one way or the other. Thoughts?