Changes in the Core language file syntax since GHC5.02?

Hi, I asked this in the fa.haskell newsgroup, but since this is more GHC-specific, maybe this list is a better place to ask. I am trying to learn the syntax of Core language files using the paper by Andrew Tolmach named "An External Representation for the GHC Core Language". This was a draft for the version 5.02. Have there been any improvements to the Core language definitions since that version and during the v6.0 implementation? Are they summarized in a document? Or maybe a fresher version of the paper is available? Thanks, -- Dmitry M. Golubovsky South Lyon, MI