Awesome :) you mentioned transformers package, did you have a look at the issues I had with using monad transformers with monad stack containing IO? I posted it a few weeks ago here: http://www.haskell.org/pipermail/jhc/2011-January/000862.html
From: john@repetae.net Date: Sat, 29 Jan 2011 20:47:20 -0800 To: haskell@haskell.org; jhc@haskell.org Subject: [jhc] ANNOUNCE: jhc 0.7.7 is out.
Announcing jhc 0.7.7! This release fixes a large number of bugs that cropped up when compiling haskell out in the wild as well as adds some more features. A major one being the garbage collector is enabled by default.
http://repetae.net/computer/jhc/
Changes: (including some changes from the unannounced 0.7.6 release)
* The Garbage Collector is now enabled by default. * new standard libraries * transformers * parsec * QuickCheck * report proper errors with line numbers for various issues with compiled code. * New option '-C' that compiles to C code and stops, useful for targeting other platforms or building shared libraries. * Nintendo Wii added as target (thanks to Korcan Hussein) * Fix major performance bug that kept WRAPPERs from being inlined in certain places. * Typechecking speed greatly increased. * monomorphism-restriction flag is now respected * empty class contexts now work * unicode in haskell source supported now * Type Defaulting now works properly * RULES parse like ghc now for compatibility * 'do' 'where' on same indent now parses * Build system fixes and cleanups * irrefutable lambda pattern bindings desugar properly now. * GHC parsing regression tests have been ported to jhc, helped find and fix many bugs. * Certain optimizations would discard RULES, these have been fixed. * Removed quadratic behavior in optimizer, speeds things up noticibly. * Garbage collector improvements, caches are pre-initialized. * Fix shiftL/R implementations for built in types. * All Num, Real, and Integral magic removed from compiler. This is a very good thing. * improved help messages
John
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