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This chapter explains how Rust procedural macros work and how they differ from regular functions and declarative macros. It walks through TokenStream, syn AST types, quote, and ToTokens to show how source code becomes structured data and back again. It then designs a bitfields macro with custom attributes, parse logic, and generated getter, setter, and clear methods. The article ends by assembling the full attribute macro that transforms a struct into a bitfield-backed API.

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