It's a shame that Pathwatcher issues this warning using console.error,
without taking any verbosity options into account:
https://github.com/atom/node-pathwatcher/blob/7ef76e5dfd/src/main.coffee#L53
Fortunately, I believe I've identified the underlying reason why this
happens, which may help resolve the following issue:
https://github.com/atom/node-pathwatcher/issues/98
If all goes well, I'll submit an upstream pull request.
I've also reinstated an old file watching test that I mistakenly removed
when I attempted to switch to chokidar instead of pathwatcher.
35da19ab4e