GhcApiAstTraversals

[Claus Reinke]

> Awesome!

Thanks!-) I've updated the code a bit, to traverse Bags and NameSets
abstractly (via toList/fromList), to extract common functionality into a
separate module Utils, and to organize the avoidance of potholes in the
Ast types based on stages (one surprise: HsBind.lhs promises that
placeHolderNames are used "prior to the renamer", but it appears that
the type checker introduces them as well - is that intended?).

Currently, the only things in Utils are a Data-based show (showData)
and query (everythingStaged), which augment the usual generic SYB
definitions with special cases for the Ghc Ast types. Does anything
similar to showData exist in the Ghc Api - what do you use for 
debugging Ghc's Ast types at the moment?

Ultimately, some of this (Utils and Instances) ought to become part 
of the Ghc Api. Meanwhile, I'd welcome feedback, on the issues 
mentioned on the Wiki page or on use cases/bugs/improvements.

Claus

Btw, is there any way to delete attachments (I couldn't find one)? Could 
someone with access please delete the two attachments marked "delete"?

> 2008/7/11 Claus Reinke <claus.reinke at talk21.com>:
>> Those who follow http://hackage.haskell.org/trac/ghc/wiki/GhcApiStatus
>> and are interested in generic traversals over Ghc Ast types might want to
>> have a look at http://hackage.haskell.org/trac/ghc/wiki/GhcApiAstTraversals
>> .
>>
>> Now, when can I have those comments and pragmas preserved, please?-)
>>
>> This is the very first version, please add your own code/improvements/bug
>> fixes!-) Are there more to-be-filled-in holes in the Ast? What do we do with
>> those abstract types in the Ast? What else have I missed? What about
>> those tickets? etc, etc.
>>
>> Claus
>>
>> PS When is the Ghc Api GSoC project going to start?
>>
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