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Add note about non_exhaustive to variant_count #92568

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Jan 8, 2022
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Add note about non_exhaustive to variant_count #92568

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4 changes: 4 additions & 0 deletions library/core/src/mem/mod.rs
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Expand Up @@ -1045,6 +1045,10 @@ pub const fn discriminant<T>(v: &T) -> Discriminant<T> {
/// return value is unspecified. Equally, if `T` is an enum with more variants than `usize::MAX`
/// the return value is unspecified. Uninhabited variants will be counted.
///
/// Note that an enum may be expanded with additional variants in the future
/// as a non-breaking change, for example if it is marked `#[non_exhaustive]`,
/// which will change the result of this function.
///
/// # Examples
///
/// ```
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