stack build --file-watch fails sometimes #1838
Description
Leaving stack build --file-watch on in a local project intermittently results in the following message:
removeWatch: invalid argument (Invalid argument)
Type help for available commands. Press enter to force a rebuild.The solution is to restart stack. This seems to have appeared since upgrading to 1.0.4.
$ stack --version
Version 1.0.4, Git revision cf18703b1392a96a5a4896a560309e501af63260 (3220 commits) x86_64
$ uname -a
Linux ip-172-31-43-180 3.13.0-79-generic #123-Ubuntu SMP Fri Feb 19 14:27:58 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux