[genrilz]

> IRC the plan isn't to use Polonius instead of NLL, but rather use NLL and kick off Polonius for certain failure cases.

Indeed. Based on the last comment on the tracking issue [0], it looks like they have not figured out whether they will be able to optimize Polonius enough before stabilization, or if they will try non-lexical lifetimes first.

[0]: https://github.com/rust-lang/rust-project-goals/issues/118