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Commit 1f108fe

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Update lint-docs to default to Rust 2024
This updates the lint-docs tool to default to the 2024 edition. The lint docs are supposed to illustrate the code with the latest edition, and I just forgot to update this in #133349. Some docs needed to add the `edition` attribute since they were assuming a particular edition, but were missing the explicit annotation.
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‎compiler/rustc_lint/src/builtin.rs‎

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@@ -948,7 +948,7 @@ declare_lint! {
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///
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/// ### Example
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///
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/// ```rust,compile_fail
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/// ```rust,compile_fail,edition2021
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/// #[no_mangle]
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/// const FOO: i32 = 5;
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/// ```

‎compiler/rustc_lint/src/impl_trait_overcaptures.rs‎

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@@ -41,7 +41,7 @@ declare_lint! {
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///
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/// ### Example
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///
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/// ```rust,compile_fail
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/// ```rust,compile_fail,edition2021
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/// # #![deny(impl_trait_overcaptures)]
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/// # use std::fmt::Display;
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/// let mut x = vec![];

‎compiler/rustc_lint_defs/src/builtin.rs‎

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@@ -1424,7 +1424,7 @@ declare_lint! {
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///
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/// ### Example
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///
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/// ```rust,compile_fail
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/// ```rust,compile_fail,edition2021
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/// macro_rules! foo {
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/// () => {};
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/// ($name) => { };
@@ -4128,7 +4128,7 @@ declare_lint! {
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///
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/// ### Example
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///
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/// ```rust,compile_fail
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/// ```rust,compile_fail,edition2021
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/// #![deny(dependency_on_unit_never_type_fallback)]
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/// fn main() {
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/// if true {

‎src/tools/lint-docs/src/lib.rs‎

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@@ -449,7 +449,7 @@ impl<'a> LintExtractor<'a> {
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.filter_map(|opt| opt.strip_prefix("edition"))
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.next()
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// defaults to latest edition
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.unwrap_or("2021");
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.unwrap_or("2024");
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cmd.arg(format!("--edition={edition}"));
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// Just in case this is an unstable edition.
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cmd.arg("-Zunstable-options");

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