Thanks, Ben. It looks like the version number for base has not been bumped to 4.11.1.0, despite incorporating this commit [1] which introduces readFieldHash to base. Currently, this makes it impossible to guard against the existence of the readFieldHash function in a project I'm working on. Ryan S. ----- [1] http://git.haskell.org/ghc.git/commit/d5577f44eaf3b9dfdfc77828038782bf818c17...