Rust closure documentation is badly written for the advanced programmer.
No, I am not going to submit a PR. The underlying system is byzantine and I don't understand it, because the docs aren't sophisticated enough to describe the totality of behavior, instead retreating to examples of simple behavior.
In other words, the book "The Rust Programming Language" is inadequate for those with decent amounts of expertise. It's insufficient, not simply by lack of information, but by pedagogical design. There is no scaffolding to the total concept system of Rust.
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