What is rust-attribute-macros-level-01?

This is a hands-on learning project for Rust procedural attribute macros, built step by step as part of a structured tutoring session. Procedural attribute macros are a Rust feature that lets you annotate a function or struct with a custom tag, written like a hash symbol followed by brackets, and have the compiler automatically transform or extend that code before it runs. This project uses two Rust libraries called syn and quote to implement those transformations. The repository includes seven working macros. Two of them, log_call and log_call_comp, wrap functions so that entering and exiting the function gets logged automatically. They differ in whether the function name is looked up at runtime or baked into the compiled output as a fixed string. Three macros modify return values: double_output doubles whatever a function returns, multiply takes a number and multiplies the return value by it, and log_multiply combines multiplication with optional logging and demonstrates how to handle multiple parameters in a macro attribute. The remaining two macros apply to structs rather than functions: describe generates a describe method that prints the struct's name and all its field names, and builder generates a new constructor and a display method derived from the struct's fields. The README shows that you can view exactly what code each macro generates at compile time using a tool called cargo-expand, which expands the macros and prints the resulting Rust code. The README is fairly short and mostly consists of a table of the macros and short setup instructions, without deeper explanation of how syn and quote work internally. This project is most useful for Rust developers learning how procedural macros work and looking for concrete, progressively complex examples to study alongside a tutoring curriculum.