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Closed Aug 29, 2026
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MaybeUninit::assume_initvalues no longer construct in place: 8 kB stack temporary + memcpy (regression in nightly-2026-06-26, caused by #158345)A-LLVMArea: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.A-mir-optArea: MIR optimizationsArea: MIR optimizationsC-optimizationCategory: An issue highlighting optimization opportunities or PRs implementing suchCategory: An issue highlighting optimization opportunities or PRs implementing suchregression-from-stable-to-betaPerformance or correctness regression from stable to beta.Performance or correctness regression from stable to beta.T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.Status: Open.#159454 In rust-lang/rust;