Standalone Deriving, GND and roles in 7.8.1-rc2

[Sergei Trofimovich]

Hello!

Trying to build random packages with fresh ghc-7.8.1-rc2
I've come up with a strange bit:

https://github.com/trofi/Idris-dev/commit/9f93122ba1aa075c2fa1555fea68a6c403697e04

Is it an intended behaviour that
    deriving instance Parsing IdrisInnerParser
capable of doing more, than
    newtype IdrisInnerParser a = IdrisInnerParser { runInnerParser :: Parser a } deriving (Parsing)
?

Thanks!

-- 

  Sergei
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