T7241.hs:7:3: error:
    Same exact name in multiple name-spaces:
      type constructor or class ‘Foo’, declared at: T7241.hs:7:3
      data constructor ‘Foo’, declared at: T7241.hs:7:3
      Probable cause: you bound a unique Template Haskell name (NameU),
      perhaps via newName, in different name-spaces.
      If that's it, then -ddump-splices might be useful