parser

[Luca Torella]

Hi, i've just downloaded the GHC code from the darcs repository and  
i'd like to learn how GHC parse the haskell code to use it in the  
next stages of the compilation.

I started digging into the code, since i didn't found a good document  
to read about it. I know that the parser is generated through Happy,  
but I'd like more information. If you know a good document that i can  
read to start understanding better the code, it's well welcome.

Moreover, digging into the code, I found something like two almost  
equal haskell code parser... one in compiler/parser/ and one in  
libraries/haskell-src/Language/Haskell... which one is the one used  
by GHC?

Thanks in advance,
Luca.