Nim’s arc/orc mode (introduced in 1.4 and likely to become default in 2.0) does borrow checking but does nit enforce it in the same way Rust does: instead, you’

Nim’s arc/orc mode (introduced in 1.4 and likely to become default in 2.0) does borrow checking but does nit enforce it in the same way Rust does: instead, you’ll get a compiler warning “i can’t just borrow here, so I am making a copy” which you can prevent by making your type uncopyable (which will make this an error). The semantics are not equivalent to rust, but they are similar. Nim stops race conditions by controlling data passage among threads (disallowing shared data between threads, in general) and always has. I am not familiar enough with Rust to say that everything rust can do and assure is indeed covered in Nim; however, plain Nim without using the escape hatches (which like Rust unsafe code, exist for those times you must use them) is safe.