One of the things I love about Go's documentation is that all examples are runnable in the Go Playground, right there, inline. You can take an example, modify i

One of the things I love about Go's documentation is that all examples are runnable in the Go Playground, right there, inline. You can take an example, modify it, and see how things change. Rust would benefit greatly from that same functionality. It also forces documentation to be up-to-date; one of the reasons I selected Go over Rust a year ago (besides more mature libraries and better documentation) was the fact that Rust seemed to be rapidly changing.