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warn against implementing Freeze #123268

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Merged
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Mar 31, 2024
Merged

warn against implementing Freeze #123268

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7 changes: 7 additions & 0 deletions library/core/src/marker.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -817,6 +817,13 @@ pub trait DiscriminantKind {
/// This can be used to declare that a constant with a generic type
/// will not contain interior mutability, and subsequently allow
/// placing the constant behind references.
///
/// # Safety
///
/// This trait is a core part of the language, it is just expressed as a trait in libcore for
/// convenience. Do *not* implement it for other types.
// FIXME: Eventually this trait should become `#[rustc_deny_explicit_impl]`.
// That requires porting the impls below to native internal impls.
#[lang = "freeze"]
#[unstable(feature = "freeze", issue = "121675")]
pub unsafe auto trait Freeze {}
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