are a type of procedural macro, which acts on Rust syntax by consuming and producing code.

Many macros are defined in the language, but new ones are created using procedural macros. The following are some examples of usage of existing macros:// Marks a function as inline
#[inline]fn add(a: i32, b: i32) -> i32 { a + b}

// Allows unused variables
#[allow(unused_variables)]fn example()

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