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Pants

Another weird error that seemingly shouldn't happen:
```
                     Exception in thread NailgunStreamWriter:
                     Traceback (most recent call last):
                       File "/Users/benjyw/.pyenv/versions/3.6.6/lib/python3.6/threading.py", line 916, in _bootstrap_inner
                         self.run()
                       File "/Users/benjyw/.cache/pants/setup/bootstrap-Darwin-x86_64/1.17.0.dev1_py36/lib/python3.6/site-packages/pants/java/nailgun_io.py", line 271, in run
                         self._in_fds.remove(fileno)
                     ValueError: list.remove(x): x not in list

```