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As of Rust 2018,
#[macro_use]
is no longer required in most circumstances, we can justuse
macros the same way as functions. I think it is generally a good idea to remove#[macro_use]
when not needed, to stop macros from polluting the crate's global namespace.https://doc.rust-lang.org/edition-guide/rust-2018/macros/macro-changes.html#macro_rules-style-macros