A nifty "skill tree" approach to mapping out the requirements in Rust's trait solver: https://rust-lang.github.io/wg-traits/roadmap/skill-tree.html
(From https://blog.rust-lang.org/inside-rust/2020/03/28/traits-sprint-1.html)
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Today I learnt about clippy::clone_on_ref_ptr, which complains about t.clone() on a Rc<Thing>. You write Rc::clone(t) instead, so it's obvious it's a cheap clone.
It's a nice approach, because it makes the expensive clones more obvious.
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Terminad is a really interesting approach to rendering markdown in the CLI. It deliberately doesn't render links, so you can always see both the link text and the URL.
In a browser you have hover to see URLs, but not necessarily in a terminal.
Go has an elegant approach to defining example functions, which are shown in docs as `main()` with the output: