Yeah, I guess it depends on how often you use the FFI, and I'm not familiar enough with these languages in practice to know how often that comes up. Part of the

Yeah, I guess it depends on how often you use the FFI, and I'm not familiar enough with these languages in practice to know how often that comes up. Part of the point of each of these is that they can utilize an existing ecosystem in which null is common (Java/JVM for Scala, C#/CLR for F#, Objective-C/Cocoa for Swift). I know that in practice in Rust, the general approach is to write safe wrapper around any C libraries you're using, so the use of nullable pointers is generally confined to those wrappers.