Compare the Rust Handler-Dispatcher program with the Go Handler-Dispatcher program and look at the truly extraordinary complexity that Rust adds to what is effectively a simple design problem that any of us have implemented several times, if your career has had a few years of original coding.

Handler-Dispatcher is not some complicated design pattern. It is very basic. Its implementation in any language should be short and elegant. This is NOT something you should be losing sleep over.

Rust, unfortunately, is even MORE complicated than C++ in language complexity today. Good tooling does not eliminate the burden of extraordinary complexity that Rust wants to enforce on its adopters.