Mathijs Kwik wrote more than two months ago, on Aug 2 2014:

I've been reading up on typed tagless-final interpretations [1] and the accompanying examples.

It seems the stuff about CPS transformations does no longer compile, probably because of stricter typing rules. I tried both ghc 7.6 and ghc 7.8, which both give a different kind of error message.

From experience, the best solution to that sort of problems is to re-write the code. Often the result is simpler. This has been the case for CPS transformations. The new version of the tagless-final CPS

GHC 7.6 has introduced the ambiguity check, which has been causing quite a bit of pain. For an example, please see http://ghc.haskell.org/trac/ghc/ticket/9587 The example in that ticket is a simplified version of the tagless final CPS transformations. transformations is notably shorter http://okmij.org/ftp/tagless-final/course/CPS.hs and it should work in any GHC with type families, including GHC 7.8.3.