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Rollup merge of rust-lang#120214 - Nadrieril:fix-120210, r=pnkfelix
match lowering: consistently lower bindings deepest-first Currently when lowering match expressions to MIR, we do a funny little dance with the order of bindings. I attempt to explain it in the third commit: we handle refutable (i.e. needing a test) patterns differently than irrefutable ones. This leads to inconsistencies, as reported in rust-lang#120210. The reason we need a dance at all is for situations like: ```rust fn foo1(x: NonCopyStruct) { let y @ NonCopyStruct { copy_field: z } = x; // the above should turn into let z = x.copy_field; let y = x; } ``` Here the `y ````@````` binding will move out of `x`, so we need to copy the field first. I believe that the inconsistency came about when we fixed rust-lang#69971, and didn't notice that the fix didn't extend to refutable patterns. My guess then is that ordering bindings by "deepest-first, otherwise source order" is a sound choice. This PR implements that (at least I hope, match lowering is hard to follow 🥲). Fixes rust-lang#120210 r? ````@oli-obk```` since you merged the original fix to rust-lang#69971 cc ````@matthewjasper````
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