Use -Wunused_crate_dependencies
for compiler crates.
It's very useful. There are some false positives involving integration tests in `rustc_pattern_analysis` and `rustc_serialize`. There is also a false positive involving `rustc_driver_impl`'s `rustc_randomized_layouts` feature. And I removed a `rustc_span` mention in a doc comment in `rustc_log` because it wasn't integral to the comment but caused a dev-dependency.
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@ -5,6 +5,8 @@ edition = "2024"
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[dependencies]
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# tidy-alphabetical-start
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rustc_index = { path = "../rustc_index", default-features = false }
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rustc_lexer = { path = "../rustc_lexer" }
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# tidy-alphabetical-end
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[target.'cfg(target_pointer_width = "64")'.dependencies]
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rustc_index = { path = "../rustc_index", default-features = false }
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