Flow server fails silently when inotify limit is reached

When the limit of inotify watches is reached, Flow server obviously does not recheck source files when they have changed. It will emit the same diagnostics every time, despite source file changes. It took me a long time to figure out this was due to the inotify limit being reached, though, because Flow server silently fails. I think it should tell me when it reaches the inotify limit, instead of failing silently.

I use Flow 0.22.1 on Gentoo Linux 4.1.12.