Stuart Cook 428be2fbc9
Rollup merge of #147497 - cyrgani:proc-macro-cleanups-3, r=petrochenkov
`proc_macro` cleanups (3/N)

Followup to rust-lang/rust#147386, which removed the old `Decode` trait.
Can be reviewed commit by commit.
2025-10-14 16:30:58 +11:00
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