Remove many `#[macro_use] extern crate foo` items#124511

Merged

bors merged 10 commits intorust-lang:masterfrom

nnethercote:rm-extern-crates

Apr 30, 2024

Commits on Apr 29, 2024

Remove `extern crate rustc_macros` from numerous crates.
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Remove `extern crate rustc_macros` from `rustc_middle`.
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Remove `extern crate rustc_session` from `rustc_lint`.
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Remove `extern crate rustc_middle` from numerous crates.
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Remove `extern crate rustc_data_structures` from `rustc_query_system`.
nnethercote
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Remove `extern crate rustc_data_structures` from numerous crates.
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Remove `extern crate bitflags` from a couple of crates.
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Remove `extern crate smallvec` from a couple of crates.
nnethercote
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Commits on Apr 30, 2024