AIUI, the underlying problem is that both Hugs and whatever toy Haskell implementations are available don't support the extensions current versions of GHC requi

AIUI, the underlying problem is that both Hugs and whatever toy Haskell implementations are available don't support the extensions current versions of GHC require. And no one has done the work to carve out a minimal stage0 compiler out of the GHC codebase that doesn't need those extensions to be built.