Function ptr_metadata

pub const fn ptr_metadata<P, M>(_ptr: *const P) -> M
where
    P: Pointee<Metadata = M> + ?Sized,

🔬This is a nightly-only experimental API. (core_intrinsics)

Lowers in MIR to Rvalue::UnaryOp with UnOp::PtrMetadata.

This is used to implement functions like ptr::metadata.