Manish Goregaokar f71b3e2b46 Rollup merge of #89532 - ecstatic-morse:maybe-live-locals-enum, r=oli-obk,tmiasko ... Document behavior of `MaybeLiveLocals` regarding enums and field-senstivity This arose from a [discussion on Zulip](https://rust-lang.zulipchat.com/#narrow/stream/189540-t-compiler.2Fwg-mir-opt/topic/MaybeLiveLocals.20and.20Discriminants) where a new contributor attempted to implement a dead-store elimination pass using this analysis. They ran into a nasty hack around `SetDiscriminant` the effect of which is to lets handle assignments of literals to enum-typed locals (e.g. `x = Some(4)`) correctly. This took me a while to figure out. Document this oddity, so the next person will have an easier time, and add a test to enshrine the current behavior. r? ``@tmiasko``		2021-10-05 12:52:48 -07:00
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src	Rollup merge of #89532 - ecstatic-morse:maybe-live-locals-enum, r=oli-obk,tmiasko	2021-10-05 12:52:48 -07:00
Cargo.toml	Migrate to 2021	2021-09-20 22:21:42 -04:00