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It was pointing to [here][link] which has been moved to the rustc-guide. It now links to [here][link2] which explains all the annotations. [link]: https://github.com/rust-lang/rust/blob/master/src/test/COMPILER_TESTS.md [link2]: https://rust-lang-nursery.github.io/rustc-guide/tests/adding.html#header-commands-configuring-rustc