summary of haskell desugaring?

Hi all, The Haskell Language report details a number of rules for simplifying the full syntax (list comprehensions, do notation, patterns and so on). I find it a lot of work to wade through the report finding all these rules. What I want is a summary of all the rules in one place. Preferably with some examples. Does anyone have such a thing? If no such thing exists, then I will make one myself and then make it available, but I thought I'd check first. I'm contemplating writing some software to go with it, but that might be a bit ambitious, we'll see. Cheers, Bernie.