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Doc tests are their own thing, right? When I do `cargo test`, it looks like it's doing two passes: one for unit tests (like described in the article), and one for doc tests.

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Yeah, doc tests are part of rustdoc and they essentially strip out the comments and generate test functions using libtest. I'm not very familiar with the internals, but they're here: https://github.com/rust-lang/rust/blob/master/src/librustdoc...

They still use this infrastructure; think of it as a specific way to construct this kind of test.

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