DON'T MERGE[ci skip]: demonstrate if_let_rescope auto migration
#4192
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Following <https://users.rust-lang.org/t/rust-2024-compatibility-lint-and-the-if-let-temporary-scope/125969/5>, I have manually audited all `if_let_rescope` cases and found out that certain existing cases can be rewritten to make it clearer semantically. So these migrations have been made in advance so that the only cases of `if-let` remaining are false positives of this lint. The crux of determining false positives here is that, according to <rust-lang/rust#133167>, `if let Some()` and other similar cases where the `else` drop is not significant are not affected by the Edition change.
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Complements #4191 to show the
if-letmigrations that I didn't do.For the sake of simplicity, the first commit of #4191 has also been cherry-picked into this branch. After that, a
cargo clippy --fixis performed after adjusting theCargo.tomlto activate theif_let_rescopelint.Notably, according to rust-lang/rust#133167 (comment),
if let Some()and other similar cases where theelsedrop is not significant are not affected by the Edition change.Please feel free to point out if I have missed a significant drop somewhere in #4191.
You can get a clearer version of the PR diff via semanticdiff.