Hi Max,
I tried adding "extensionFlags = Opt_Cpp" to dflags, but I still got the same
error.
When you mentioned
"You might have to iterate a few times to find the correct set of flags.",
did you mean trying out all the "data ExtensionFlag" flags in
compiler/main/DynFlags.hs and find a subset that works?
data ExtensionFlag
= Opt_Cpp
| Opt_OverlappingInstances
| Opt_UndecidableInstances
| Opt_IncoherentInstances
...
Thanks
Jane
________________________________________
From: omega.th...@gmail.com [omega.th...@gmail.com] On Behalf Of Max
Bolingbroke [batterseapo...@hotmail.com]
Sent: Tuesday, January 25, 2011 1:34 AM
To: Jane Ren
Cc: Simon Peyton-Jones; glasgow-haskell-users@haskell.org
Subject: Re: Question about Haskell AST
On 24 January 2011 17:20, Jane Ren <j2...@ucsd.edu> wrote:
> When I try this, I get
> "AstWalker: panic! (the 'impossible' happened)
> (GHC version 7.0.1 for x86_64-apple-darwin):
> lexical error at character 'i'
It looks like you need to add the CPP extension to the DynFlags:
setSessionDynFlags dflags { extensionFlags = Opt_Cpp : extensionFlags dflags }
You might have to iterate a few times to find the correct set of flags.
Cheers,
Max
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