3 The tracking issue for this feature is: [#29597]
5 [#29597]: https://github.com/rust-lang/rust/issues/29597
7 This feature is part of "compiler plugins." It will often be used with the
8 [`plugin`] and `rustc_private` features as well. For more details, see
11 [`plugin`]: language-features/plugin.html
13 ------------------------