See documentation at http://fay-lang.org/ or build your own documentation with:
$ cabal build $ dist/build/fay-docs/fay-docs
Changed the return type specification of the FFI, breaking change. You will have to change your code.
See full history at: https://github.com/chrisdone/fay/commits
Note: This package has metadata revisions in the cabal description newer than included in the tarball. To unpack the package including the revisions, use 'cabal get'.