[Haskell-cafe] Standard package file format

[Imants Cekusins]

.. if this helps the discussion, here is cabal file "spec"
<https://github.com/ghc/packages-Cabal/blob/71535bfb1bf439a1af0308a8e5da9ef98cd2d88d/Cabal/Distribution/Types/GenericPackageDescription.hs>
(see also other files in the same directory)

these types are used to parse .cabal.

one benefit from using these types in reverse (to generate .cabal from .hs)
would be:

it is possible to write a few libs which generate well-formed cabal files
from a simplified API. It is possible this was done already.
​
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