[sfkdjf9j3j]

That's not true and a misunderstanding of what `unsafe` does. It has nothing to do with borrow checking (which is what trips people up when writing a double linked list). Unsafe is primarily used for FFI and lets you dereference raw pointers (among a few other related uses).

[Matthias247]

It is in general an escape hatch for being able to write code that isn't possible in safe Rust. Limitations of the borrow checker (e.g. for backpointers in circular data structures) definitely fall into that category. Even without FFI Rust would not be practical without unsafe.

[Ericson2314]

You would use raw pointers instead of normal ones the type system (including borrow checker) cares more about, so ultimately yes it is about subverting the type system.