Implement `int_format_into` feature I took over rust-lang/rust#138338 with `@madhav-madhusoodanan's` approval. Since https://github.com/rust-lang/rust/pull/136264, a lot of changes happened so I made use of them to reduce the number of changes. ACP approval: https://github.com/rust-lang/libs-team/issues/546#issuecomment-2707244569 ## Associated Issue - https://github.com/rust-lang/rust/issues/138215 r? `@hanna-kruppe` |
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