I don't think Hello World is a good example for anything; all you can do with it is microbenchmark, which is not particularly interesting. There are also no mea

I don't think Hello World is a good example for anything; all you can do with it is microbenchmark, which is not particularly interesting. There are also no meaningful unit tests to write with Hello World. With tiny examples, compile/tooling times tend to dominate. More interesting would be a larger, non-toy prototype, where the tests and prototyping effort are meaningful.