Hi, I do not know why, my ghc 7.2.1 does not seem to support DeriveRepresentable. I compiled the ghc 7.2.1 myself by ghc 7.0.4. All options default.
$ ghc Types/TopTalkerRecord.hs
Types/TopTalkerRecord.hs:2:14:
Unsupported extension: DeriveRepresentable
$ ghc --version
The Glorious Glasgow Haskell Compilation System, version 7.2.1
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竹密岂妨流水过
山高哪阻野云飞
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