Rust에서 main 이전에도 실행되는 코드가 있다

Rust's pre-main execution phase enables developers to initialize code before main, offering opportunities for performance optimization. By using constructors and linker sections, developers can pre-configure subsystems—such as CLI commands or string interning pools—without runtime locks or allocations. While powerful for high-performance applications, this technique requires careful consideration of platform compatibility and limitations.