> newtype Void = Void Void deriving Show

> Hugs and hbc accept it without complaining. (I haven't got nhc installed.)

nhc98 reports

  ====================================
        Error when renaming::
  Newtype Main.B is circular.
  Newtype Main.A is circular.
  Newtype Main.Void is circular.

which seems reasonable to me.

Regards,
    Malcolm

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