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Rollup merge of #130343 - Fayti1703:patch-correct-async-block-lint-doc, r=compiler-errors

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docs: Enable required feature for 'closure_returning_async_block' lint

Failing to do this results in the lint example output complaining about the lint not existing instead of the thing the lint is supposed to be complaining about.

See <https://doc.rust-lang.org/rustc/lints/listing/allowed-by-default.html#closure-returning-async-block>:
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León Orell Valerian Liehr 2024-09-14 18:12:13 +02:00 • committed by GitHub
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compiler/rustc_lint/src/async_closures.rs
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@ -12,6 +12,7 @@ declare_lint! {
/// ### Example /// ### Example
/// ///
/// ```rust /// ```rust
/// #![feature(async_closure)]
/// #![warn(closure_returning_async_block)] /// #![warn(closure_returning_async_block)]
/// let c = |x: &str| async {}; /// let c = |x: &str| async {};
/// ``` /// ```