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Add Clippy version to Clippy's lint list Hey, hey, the semester is finally over, and I wanted to get back into hacking on Clippy. It has also been some time since our metadata collection monster has been feed. So, this PR adds a new attribute `clippy::version` to document which version a lint was stabilized. I considered using `git blame` but that would be very hacky and probably not accurate. I'm also thinking that this attribute can be used to have a `clippy::nightly` lint group which is allow-by-default that delays setting the actual lint group until the defined version is reached. Just something to consider regarding #6623 🙃 This PR only adds the version to 4 lints to keep it reviewable. I'll do a followup PR to add the version to other lints if the implementation is accepted 🙃  Also, mobile approved xD  --- r? `@flip1995` cc: #7172 closes: #6492 changelog: [Clippy's lint list](https://rust-lang.github.io/rust-clippy/master/index.html) now displays the version a lint was added. 🎉 --- Example lint declaration after this update: ```rs declare_clippy_lint! { /// [...] /// /// ### Example /// ```rust /// // Bad /// let x = 3.14; /// // Good /// let x = std::f32::consts::PI; /// ``` #[clippy::version = "pre 1.29.0"] pub APPROX_CONSTANT, correctness, "the approximate of a known float constant (in `std::fXX::consts`)" } ``` |
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