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Comment by steveklabnik | Hacker News Reader

I'm not sure what that has to do with anything. The macro isn't what makes it safe. The unsafe code being properly written is.

but without macros, how would you expose a safe interface?

  fn pin(x: T) -> Pin<&mut T> { ... }

would move the value

Your macroless variant of Rust would offer a safe builtin that does this. It doesn't need to be implemented with a macro.