From: Dylan DPC <99973273+Dylan-DPC@users.noreply.github.com>
Date: Wed, 13 Jul 2022 14:02:33 +0000 (+0530)
Subject: Rollup merge of #98574 - dingxiangfei2009:let-else-thir, r=oli-obk
X-Git-Url: https://git.lizzy.rs/?a=commitdiff_plain;h=0083cd2fd498edb6a4e37bf4c711d11364e0ef20;p=rust.git

Rollup merge of #98574 - dingxiangfei2009:let-else-thir, r=oli-obk

Lower let-else in MIR

This MR will switch to lower let-else statements in MIR building instead.

To lower let-else in MIR, we build a mini-switch two branches. One branch leads to the matching case, and the other leads to the `else` block. This arrangement will allow temporary lifetime analysis running as-is so that the temporaries are properly extended according to the same rule applied to regular `let` statements.

cc https://github.com/rust-lang/rust/issues/87335

Fix #98672
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0083cd2fd498edb6a4e37bf4c711d11364e0ef20