I am looking for packages on hackage which use MVars extensively. Those which create plenty of MVars -- not just one or two for conditional synchronization or to keep track of a value throughout the program. My purpose is to analyze usage patterns of MVars. Does anybody have any suggestions?

So far I have analyzed a few packages:

* conjure (0.1)

* distributed-process (0.4.2)

* distributed-process-p2p (0.1.1.0)

* leksah (0.12.1.3)

* manatee-core (0.1.1)

* urlcheck (0.1.1)

Nonetheless, I feel like I still haven't covered a good enough range of usage, since some examples are small, and some use MVars just for a small number of cases, while the heavy lifting is done with STM. And surely because there are only 6 of them.

Any suggestion will be very much appreciated.