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Pants

so, the version of mock that's used in pants seems to have an undeclared dep on setuptools:

```**** Failed to install mock-1.3.0. stderr:
mock requires setuptools&gt;=17.1. Aborting installation```

should we go ahead and declare that dep explicitly for pants?

interesting - how are those two things ever resolving together if setuptools==5.4.1?

but yeah, bumping setuptools probably fine

i don't know precisely why the error doesn't trigger in more cases though.

```[illuminati pants-release (master)]$ egrep "mock|setuptools" 3rdparty/python/requirements.txt 
mock==1.3.0
setuptools==5.4.1
```

<@U053J9JB4>:  <@U0CUD02JV>: 0.0.51 was pretty stable for us, and I think foursquare was using it to. We’ve moved on since.  0.0.53 did not work for us, we had to move a few commits past that.  3d7c03ab5a7fcd2459128d9cc849031b28b3f350 was a critical fix.  

thanks <@U053H6LQS>, we will target 0.0.51

<@U06A03HV1> would you mind merging <https://rbcommons.com/s/twitter/r/2979/>
when the travis goes green?

also feel free to kill <https://travis-ci.org/pantsbuild/pants/builds/86726050>

it was pretty straightforward, just missed a couple things

<@U054MQUPL>: Do you have thoughts on <https://github.com/pantsbuild/pants/issues/2414>

what does the output look like in that case?

it shows the pid and port of the server that is not running

the workaround is to run ./pants server again, then it says already running with the right pid / port

whats the string look like around the pid and port?

I’ll add repro instructions to the issue