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Rust doesn't do tracing GC, and Nim is moving to an ARC system I hear.

Borrow checking isn't reference counting and Nim still needs to prove itself.

Rust can use reference counting though, in addition to borrow checking.

Just as it can use a tracing GC, like in Servo interop.

Borrow checking isn't tracing GC. That's all I said and all I meant.