Polonius WG: add minutes for the 2019/03/07 meeting

working-groups/polonius/minutes/2019.03.07-meeting.md

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+# WG-Polonius meeting minutes: 2019/03/07
+---
+
+Relevant links:
+- The meeting happened in this [Zulip thread](https://rust-lang.zulipchat.com/#narrow/stream/186049-t-compiler.2Fwg-polonius/topic/meeting.202019.2E03.2E07)
+- The [Paper document](https://paper.dropbox.com/doc/Polonius-Roadmap--AY6C806s~AZK~e7wagmys2_wAg-hk3a9ynduUN2gk1A0NNTF) for the WIP roadmap
+
+---
+
+The first meeting of the WG Polonius was dedicated to finding concrete next steps, both as part of working on the roadmap, and as onboarding [@albins][Albin] into the group. Since [Albin] will do a masters related to Polonius, we also worked out other areas they could tackle as time progressed.
+
+Ultimately, a good starter issue was found in creating a new Polonius "hybrid" variant, bridging the location insensitive and complete analyses: a realistic way for rustc to use Polonius.
+
+We then described a possible follow-up task, focusing on Polonius completeness: incorporating rustc's move/overwrite analysis, in a way similar to how it was done in Lark.
+
+We also spent time talking about next steps in documentation, whether in talks ([Niko]) or written docs ([Rémy]).
+
+Possible talks:
+- a walkthrough of a more complex theoretical example
+- a more practical walk-through with a focus on the concrete parts of the Polonius computation: interfacing with rustc and transferring data, computing the analysis' datalog rules, how datafrog works.
+
+Following those, we also mentioned a longer term task: the more complicated analysis handling higher-ranked regions described in [this blog post](http://smallcultfollowing.com/babysteps/blog/2019/01/21/hereditary-harrop-region-constraints/).
+
+The final points were more about crosscutting concerns applicable to all WGs: how would Github permissions work, and setting up the polonius and datafrog to follow the soon-to-be finalized "crate conformance policy".
+
+----
+The major next steps we decided on were:
+- [Matthew] will write mentoring instructions for the [hybrid algorithm task](https://github.com/rust-lang/polonius/issues/100)
+- [Niko] and [Albin] will prepare the follow-up walkthrough of Polonius (the specific time, and contents). 
+- [Niko] will review the [subset relation PR](https://github.com/rust-lang/polonius/pull/99)
+
+[Albin]: https://github.com/albins
+[Niko]: https://github.com/nikomatsakis
+[Matthew]: https://github.com/matthewjasper
+[Rémy]: https://github.com/lqd
+[Lark]: https://github.com/lark-exploration/lark/blob/master/components/lark-type-check/src/full_inference/analysis/initialization.rs