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Showing content from https://github.com/rust-lang/rust/issues/126799 below:

Tracking Issue for `core::clone::CloneToUninit` trait · Issue #126799 · rust-lang/rust · GitHub

Feature gate: #![feature(clone_to_uninit)]

This is a tracking issue for CloneToUninit and its impls. This trait backs the behavior of Rc::make_mut and Arc::make_mut, and likely in the future also Box::clone.

// core::clone

pub unsafe trait CloneToUninit {
    unsafe fn clone_to_uninit(&self, dst: *mut Self);
}

unsafe impl<T: Clone> CloneToUninit for T;
unsafe impl<T: Clone> CloneToUninit for [T];

// TODO:
// unsafe impl CloneToUninit for str;
// unsafe impl CloneToUninit for CStr;
// unsafe impl CloneToUninit for OsStr;
// unsafe impl CloneToUninit for Path;

• Implementation: Generalize {Rc,Arc}::make_mut() to unsized types. #116113
• CloneToUninit impls #126877
• Convert Box::clone to be based on CloneToUninit
• Final comment period (FCP)¹
• Stabilization PR

• Consider using *mut () in the signature instead of *mut Self. This makes CloneToUninit dyn-safe. Generalize {Rc,Arc}::make_mut() to unsized types. #116113 (comment)

1. https://std-dev-guide.rust-lang.org/feature-lifecycle/stabilization.html ↩

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