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Pants is having trouble finding the following in a private pypi repository that proxies <http://pypi.org|pypi.org>
```ERROR: No matching distribution found for PyMCP2221A&lt;2,&gt;=1.4.0```
I don't think it has anything to do with module_mappings. Any ideas for what could be the cause for issue?

I think this was an error on my end with configuration of the proxy

But, not, there wasn't. It was just showing the command it ran and then the module that couldn't be found.

What's odd is that generating the lockfile still ran for a full 6 minutes before getting to this error point. I'm surprised it takes that long if none of the distributions were resolvable.

`pip` does almost nothing in parallel… if it has a cold cache, it can take a long time to do anything. i’m also not sure that it caches negative lookups for very long.