The following example of how one might try to implement a self-referential struct is unsound. use std::cell::UnsafeCell; use std::pin::Pin; use std::marker::PhantomPinned; struct SelfRef { value: UnsafeCell<u64>, ptr: *const u64, _pin: PhantomPinned, } impl SelfRef { fn new(value:…

Are sound self-referential structs possible without boxing?

alice January 13, 2021, 6:23pm 18

Pin guarantees that if the destructors don't run, then the memory is leaked and hence the pointer would not be dangling.

1 Like

Does pinning provide a backdoor to aliased mutability?

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