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The `byte_sub` method was stabilized in Rust 1.75.0. By using that method, we no longer need the unstable `ptr_metadata` feature for implementing `Arc::from_raw`. This brings us one step closer towards not using unstable compiler features. Reviewed-by: Benno Lossin <benno.lossin@proton.me> Reviewed-by: Martin Rodriguez Reboredo <yakoyoku@gmail.com> Reviewed-by: Trevor Gross <tmgross@umich.edu> Signed-off-by: Alice Ryhl <aliceryhl@google.com> Link: https://lore.kernel.org/r/20240215104601.1267763-1-aliceryhl@google.com [ Reworded title. ] Signed-off-by: Miguel Ojeda <ojeda@kernel.org>