Rust Macro Guide

Write powerful macros in Rust to reduce boilerplate and create expressive APIs.

Usage

Describe the repetitive code you want to eliminate or ask about macro concepts for implementation help.

Examples

• "Write a macro_rules! macro to generate getters for struct fields"
• "How do I create a derive macro for my trait?"
• "Debug this macro that isn't expanding correctly"

Guidelines

• Start with macro_rules! before reaching for procedural macros
• Explain macro hygiene and how it affects variable scoping
• Show cargo-expand for debugging macro expansions
• Cover common patterns: repetition, TT munchers, push-down accumulation
• Warn about compile-time cost of complex macros