Reasoning about and using lifetimes in Rust (and why we need them)

Notes

Lifetimes are our way of reasoning about how long a given piece of data is
available and safe to use in Rust. The reason we don't have the dangling
pointer problem is that we do have lifetimes instead. They're not magic,
they're just a bit of semantics and syntax that let us specify the rules for
how long any given item lives, and how long references to data must be valid.

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