[Haskell-cafe] haskell-src-exts maintenance

Alan & Kim Zimmerman alan.zimm at gmail.com
Wed Jul 1 07:33:26 UTC 2015

I think the main argument against using GHC is that the library is
intimately tied to the current compiler, so writing a tool to process
haskell source which is compiler version independent it tricky, requiring
lots of CPP.

I am starting to wonder if it does not make sense to make a companion
library for each GHC release with is just the parser/AST, and so can be
used with any other compiler, even a non-ghc one.


On Wed, Jul 1, 2015 at 9:18 AM, Mike Izbicki <mike at izbicki.me> wrote:

> I've always been curious why we need a stand alone package for parsing
> haskell code?  Last time I tried to use haskell-src-exts (admittedly
> several years ago), it was out of date and didn't support the
> extensions I wanted.
> It seems like the ideal solution would be to have GHC's parsing code
> exposed as a library.  And this library would be compatible with
> template haskell.  Is there some technical reason why this is
> inherently difficult?  Or is it just an accident of history that
> things didn't develop that way?
> On Tue, Jun 30, 2015 at 11:54 PM, Christian Marie <christian at ponies.io>
> wrote:
> > On Mon, Jun 29, 2015 at 01:13:54PM +0100, Matthew Pickering wrote:
> >> There are a large number of untriaged pull requests and issues
> >> currently open on the issue tracker for haskell-src-exts. The tool is
> >> widely used by tool writers but the last commit to the project is now
> >> over 6 months ago.
> >
> > I was about to post this exact message after searching around for a good
> hour.
> >
> >> 1. Does anyone know if Niklas or Peter plan to return to the project?
> >
> > I didn't contact them directly. I'm not so sure if Nicklas is active at
> all.
> >
> >> 2. Is there anyone else who is interested in updating the HSE parser?
> >
> > Yes, I've got at least one fix I'd like to make myself and I'd be happy
> to do
> > some triaging and releasing too. Most of the PRs look pretty good.
> >
> > Roman Cheplyaka is a maintainer on hackage, hopefully he sees and knows
> > something aobut this.
> >
> > I'll email some people in the haskell suite group directly if this thread
> > doesn't go anywhere.
> >
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