[PATCH] contrib: add a tool to detect cyclic references

[Augie Fackler]

> On May 24, 2017, at 19:57, Jun Wu <quark at fb.com> wrote:
> 
> Excerpts from Jun Wu's message of 2017-05-24 12:36:20 -0700:
>> [...]
>> +if leakdetect.disabled:
>> +    sys.exit(80, 'skipped: missing feature: cpython')
> 
> This line is wrong, will be fixed in V2.
> 
> That said, I'm more interested in how do we feel about cycles in general. My
> impression is it's a best-effort to remove cycles and I plan to spend some
> time on it.

It is best-effort, though we've never had a tool for it before. With a tool, it might be worth avoiding them more rigorously.

> 
>> [...]
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