I'm happy to announce the first release of syntactic: http://hackage.haskell.org/package/syntactic providing generic abstract syntax and utilities for embedded languages. To get an idea of what it's about, check out the tiny(!) implementation of (simplified) Feldspar in the Examples directory: http://projects.haskell.org/syntactic/Examples/MuFeldspar The library is intended to provide a growing set of utilities for embedded languages. In particular, I hope to be able to provide safe interfaces to various unsafe techniques for speeding things up. Comments, patches and clients are welcome! / Emil