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rustc_const_eval: adopt let else in more places #94143
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    | Some changes occured to the CTFE / Miri engine cc @rust-lang/miri | 
| r? @lcnr (rust-highfive has picked a reviewer for you, use r? to override) | 
              
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Adopt let else in more places Continuation of rust-lang#89933, rust-lang#91018, rust-lang#91481, rust-lang#93046, rust-lang#93590, rust-lang#94011. I have extended my clippy lint to also recognize tuple passing and match statements. The diff caused by fixing it is way above 1 thousand lines. Thus, I split it up into multiple pull requests to make reviewing easier. This is the biggest of these PRs and handles the changes outside of rustdoc, rustc_typeck, rustc_const_eval, rustc_trait_selection, which were handled in PRs rust-lang#94139, rust-lang#94142, rust-lang#94143, rust-lang#94144.
    
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Adopt let else in more places Continuation of rust-lang#89933, rust-lang#91018, rust-lang#91481, rust-lang#93046, rust-lang#93590, rust-lang#94011. I have extended my clippy lint to also recognize tuple passing and match statements. The diff caused by fixing it is way above 1 thousand lines. Thus, I split it up into multiple pull requests to make reviewing easier. This is the biggest of these PRs and handles the changes outside of rustdoc, rustc_typeck, rustc_const_eval, rustc_trait_selection, which were handled in PRs rust-lang#94139, rust-lang#94142, rust-lang#94143, rust-lang#94144.
              
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nit, then r=me
Co-authored-by: lcnr <[email protected]>
| @bors r+ rollup | 
| 📌 Commit 413f3f7 has been approved by  | 
    
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…askrgr Rollup of 10 pull requests Successful merges: - rust-lang#91192 (Some improvements to the async docs) - rust-lang#94143 (rustc_const_eval: adopt let else in more places) - rust-lang#94156 (Gracefully handle non-UTF-8 string slices when pretty printing) - rust-lang#94186 (Update pin_static_ref stabilization version.) - rust-lang#94189 (Implement LowerHex on Scalar to clean up their display in rustdoc) - rust-lang#94190 (Use Metadata::modified instead of FileTime::from_last_modification_ti…) - rust-lang#94203 (CTFE engine: Scalar: expose size-generic to_(u)int methods) - rust-lang#94211 (Better error if the user tries to do assignment ... else) - rust-lang#94215 (trait system: comments and small nonfunctional changes) - rust-lang#94220 (Correctly handle miniz_oxide extern crate declaration) Failed merges: r? `@ghost` `@rustbot` modify labels: rollup
  
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Continuation of #89933, #91018, #91481, #93046, #93590, #94011.
I have extended my clippy lint to also recognize tuple passing and match statements. The diff caused by fixing it is way above 1 thousand lines. Thus, I split it up into multiple pull requests to make reviewing easier. This PR handles rustc_const_eval.