Code derived from the document "Report on the Programming Language
Haskell 2010", is distributed under the following license:

  Copyright (c) 2010 Simon Marlow

  The authors intend this Report to belong to the entire Haskell
  community, and so we grant permission to copy and distribute it for
  any purpose, provided that it is reproduced in its entirety,
  including this Notice.  Modified versions of this Report may also be
  copied and distributed for any purpose, provided that the modified
  version is clearly presented as such, and that it does not claim to
  be a definition of the Haskell 2010 Language.