protocol_v3_macro is a procedural macro. It will run at compile time and transform your program's source code.
Adding protocol_v3_macro macro(s) as a dependency
Run this command in a terminal, in your project's directory:
cargo add protocol_v3_macro
To add it manually, edit your project's Cargo.toml file and add to the [dependencies] section:
protocol_v3_macro = "0.1.2"
You may need to import the macro(s) with use protocol_v3_macro::*.
protocol_v3_macro documentation.