I've been working on it for the last couple of days. I first tried to remove the bounds on GHC. I also upgraded some of the versions of the packages, and had to rebuild "list-tries" and "ghc-syb-utils" to remove the compile-time dependence on GHC 6.12 and use GHC 7.0.
After adding some new instances of Search and tweaking things a bit, Scion is compiling. However, I think it is not going to work yet, because the type HsWrapper used in scion/lib/Inspect/TypeOf.hs has changed significantly from version 6.12 [http://www.haskell.org/ghc/docs/6.12.3/html/libraries/ghc-6.12.3/HsBinds.html#t:HsWrapper] to version 7.0.2 [http://www.haskell.org/ghc/docs/7.0.2/html/libraries/ghc-7.0.2/HsBinds.html#t:HsWrapper], and I don't know how to make it work.
Is there any place where I can commit the new code so more people can take a look at it and try to make it work? I think that for somebody who knows the GHC internals, it will be matter of a second.
In any case, I've taking care of adding all the new things between conditional compilation directive for GHC 7, and to change the Cabal file so differences between 6.12 and 7.0 are taken care (for example, exporting 'syb' in 7.0 instead of 'ghc-syb' in 6.12).

Thanks in advance

2011/3/11 JP Moresmau <jpmoresmau@gmail.com>
Yes, now that there's a new haskell platform available we should
support it. What you can do is extract the scion code, tweak the
scion.cabal file to remove the upper bound on GHC, and see if it
builds. Then use the generated exe in the Scion preferences.


On Fri, Mar 11, 2011 at 1:50 PM, Alejandro Serrano Mena
<trupill@gmail.com> wrote:
> Hello,
> I've been using EclipseFP for several months. Yesterday, a new Haskell
> Platform package was uploaded, which includes GHC 7.0.2 as the default
> compiler.
> I've tried to use the new Platform in my EclipseFP installation [Eclipse
> Helios, Mac OS X 10.6] but the scion-server refuses to compile because of a
> dependency on GHC < 6.13. I've looked at the new ghc API package and seems
> very close to the old one, and I think all of the dependencies on scion are
> built correctly in GHC 7 according to Hackage.
> Is there any idea on how to add support for GHC 7? If so, I wouldn't mind
> helping tweakening some files...
> Thanks in advance
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JP Moresmau