Hi all,

Currently the tests are failing on master due to my merging two pull requests yesterday that it turns out are mutually incompatible. My proposed fix is in PR 1741:

https://github.com/yt-project/yt/pull/1741

Unfortunately the fix isn't trivial (unless I also back out PR 1693, which I'd prefer not to), so I'd really appreciate at least one or two other sets of eyes on the PR. I'd especially like to hear from people who have poked at the internals of yt's field and field detection system.

-Nathan