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doc(std): clarify NonZero<T> usage limitation in doc comment #143130

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doc(std): clarify NonZero<T> usage limitation in doc comment #143130

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9 changes: 9 additions & 0 deletions library/core/src/num/nonzero.rs
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Expand Up @@ -111,6 +111,15 @@ impl_zeroable_primitive!(
/// ```
///
/// [null pointer optimization]: crate::option#representation
///
/// # Note on generic usage
///
/// `NonZero<T>` can only be used with some standard library primitive types
/// (such as `u8`, `i32`, and etc.). The type parameter `T` must implement the
/// internal trait `ZeroablePrimitive`, which is currently permanently unstable
/// and cannot be implemented by users. Therefore, you cannot use `NonZero<T>`
/// with your own types, nor can you implement traits for all `NonZero<T>`,
/// only for concrete types.
#[stable(feature = "generic_nonzero", since = "1.79.0")]
#[repr(transparent)]
#[rustc_nonnull_optimization_guaranteed]
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