More exports and documentation for GHC API Parser Module

I would like to be able to use the GHC API for parsing. Right now this is in the Parser and Lexer modules:

Parser: http://www.haskell.org/ghc/docs/7.8.2/html/libraries/ghc-7.8.2/Parser.html Lexer: http://www.haskell.org/ghc/docs/7.8.2/html/libraries/ghc-7.8.2/Lexer.html

GHC currently exposes only a few parsers here. I'd like to make a few modifications:

1. Expose a few more parsers than currently are exposed in the Parser module. In particular, I'd like import statements, type signatures, declarations, and expressions, at least, in addition to what's already there.
2. Add some Haddock documentation to the top of the Parser module describing how to use it, since the types themselves are pretty opaque here.
3. Export a clean and self-contained parsing API from the GHC module.

See minor discussion here: http://comments.gmane.org/gmane.comp.lang.haskell.ghc.devel/4791

Trac metadata

Trac field	Value
Version	7.8.2
Type	FeatureRequest
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	GHC API
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