Haskell2010's definition is like 20 pages long and that includes the definition of the standard library. This core accounts for 90-99% of the code in project that isn't going out of its way to use fancy features for the lulz.
It's cool Haskell goes through a small IR. That doesn't make TH, rewrite rules, CPP, the million extensions, STG, the runtime, the gigantic syntax, or the quarter million SLOC implementation simple.
