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Since we are going to make `Mutex<T>` structurally pin the data (i.e. `T`), therefore `.lock()` function only returns a `Guard` that can dereference a mutable reference to `T` if only `T` is `Unpin`, therefore restrict the impl `Reader` block of `Mutex<T>` to that. Signed-off-by: Boqun Feng <boqun.feng@gmail.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Danilo Krummrich <dakr@kernel.org> Link: https://patch.msgid.link/20251022034237.70431-1-boqun.feng@gmail.com