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Mark std::fmt::from_fn as #[must_use] #136502

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Merged
merged 1 commit into from
Feb 5, 2025
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Mark std::fmt::from_fn as #[must_use] #136502

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1 change: 1 addition & 0 deletions library/core/src/fmt/builders.rs
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Expand Up @@ -1228,6 +1228,7 @@ impl<'a, 'b: 'a> DebugMap<'a, 'b> {
/// assert_eq!(format!("{:?}", wrapped), "'a'");
/// ```
#[unstable(feature = "debug_closure_helpers", issue = "117729")]
#[must_use = "returns a type implementing Debug and Display, which do not have any effects unless they are used"]
pub fn from_fn<F: Fn(&mut fmt::Formatter<'_>) -> fmt::Result>(f: F) -> FromFn<F> {
FromFn(f)
}
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