[someone_19]

You can do this quite easily in Rust. But you have to overload operators to make your type make sense. That's also possible, you just need to define what type you get after dividing your type by a regular number and vice versa a regular number by your type. Or what should happen if when adding two of your types the sum is higher than the maximum value. This is quite verbose. Which can be done with generics or macros.

[josephg]

You can do it at runtime quite easily in rust. But the rust compiler doesn’t understand what you’re doing - so it can’t make use of that information for peephole optimisations or to elide array bounds checks when using your custom type. And you don’t get runtime errors instead of compile time errors if you try to assign the wrong value into your type.

[someone_19]

Here is example of compile time error with wrong newtype argument:

https://play.rust-lang.org/?version=stable&mode=debug&editio...

rust-analyzer gives an error directly in IDE.