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warn against implementing Freeze

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Ralf Jung 2024-03-31 12:46:37 +02:00
parent c93b17d6d2
commit 602401c4d4
1 changed files with 7 additions and 0 deletions
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7
library/core/src/marker.rs
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@ -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 {}