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[cfg_match] Document the use of expressions. #135625

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Jan 29, 2025
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[cfg_match] Document the use of expressions. #135625

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11 changes: 11 additions & 0 deletions library/core/src/macros/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -313,6 +313,17 @@ pub macro cfg_match {
/// }
/// }
/// ```
///
/// If desired, it is possible to return expressions through the use of surrounding braces:
///
/// ```
/// #![feature(cfg_match)]
///
/// let _some_string = cfg_match! {{
/// unix => { "With great power comes great electricity bills" }
/// _ => { "Behind every successful diet is an unwatched pizza" }
/// }};
/// ```
#[cfg(not(bootstrap))]
#[unstable(feature = "cfg_match", issue = "115585")]
#[rustc_diagnostic_item = "cfg_match"]
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