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

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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
This commit is contained in:
Dylan DPC 2022-07-13 19:32:33 +05:30 • committed by GitHub
commit 0083cd2fd4
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33 changed files with 576 additions and 265 deletions
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compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs
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@ -1311,7 +1311,7 @@ impl<'a, 'tcx> InferCtxtExt<'tcx> for InferCtxt<'a, 'tcx> {
visitor.visit_body(&body);
let typeck_results = self.in_progress_typeck_results.map(|t| t.borrow()).unwrap();
let Some(liberated_sig) = typeck_results.liberated_fn_sigs().get(fn_hir_id) else { return false; };
let Some(liberated_sig) = typeck_results.liberated_fn_sigs().get(fn_hir_id).copied() else { return false; };
let ret_types = visitor
.returns