Visualisation in Markdown: https://visdown.amitkaps.com/ (elegant approach, especially considering MD has no explicit extension facility)
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Go has an elegant approach to defining example functions, which are shown in docs as `main()` with the output: https://go.dev/blog/examples
One cute feature of markdown I'd not noticed before: there's no syntax for images *without* a description (i.e. alt text).
https://spec.commonmark.org/0.31.2/#images
It's always seemed odd to me that the Rust stdlib is so lean (no random numbers, regex, HTTP) yet clippy is so big (correctness, performance, style preferences, even 'too many arguments').
Maybe it's because cargo is mature but clippy doesn't have an extension ecosystem?