Differences lists are a list-like type supporting O(1) append. This is particularly useful for efficient logging and pretty printing, (e.g. with the Writer monad), where list append quickly becomes too expensive. Fix: Patch attached with submission follows:
Class Changed From-To: maintainer-update->change-request Fix category (new ports should be change-requests) (via the GNATS Auto Assign Tool)
Responsible Changed From-To: freebsd-ports-bugs->miwi I'll take it.
State Changed From-To: open->closed New port added, with minor changes. Thanks!