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reduce calls to attr.span() in old doc attr parsing r? `@oli-obk` should be trivial, can also delegate to `@GuillaumeGomez` or `@JonathanBrouwer.` As part of making span() return an option I want to reduce the number of places we call span in without it being known what specific attr it's for. This makes that more obvious for doc. Part of a chain of PRs that's coming. https://github.com/rust-lang/rust/issues/131229#issuecomment-3395316064