any luck using "retrie" refactoring tool on GHC sources?

I'm trying to use the retrie refactoring tool, but I'm getting a mysterious error message: nr@homedog ~/a/g/compiler [1]> retrie --adhoc "forall x . not (backendNeedn'tLink x) == backendNeedsLink x" parseAdhocs:1:80: error: parse error on input ‘#-}’ retrie: user error (parse failed) The Tool was installed using cabal install; its github page is https://github.com/facebookincubator/retrie/#readme. Has anybody had any success using this tool on the GHC sources? I'd love a workaround, or just advice. Norman