Jacob Pratt 21a0e86234
Rollup merge of #125627 - vincenzopalazzo:macros/cargo-fix-expr2024, r=compiler-errors,eholk
migration lint for `expr2024` for the edition 2024

This is adding a migration lint for the current (in the 2021 edition and previous)
to move expr to expr_2021 from expr

Issue https://github.com/rust-lang/rust/issues/123742

I created also a repository to test out the migration https://github.com/vincenzopalazzo/expr2024-cargo-fix-migration

Co-Developed-by: ``@eholk``
2024-07-10 00:37:10 -04:00
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