Not only in one line but also you don't need to wrap your function argument with a class instantiation, you can just pass the integer into the function you are

Not only in one line but also you don't need to wrap your function argument with a class instantiation, you can just pass the integer into the function you are calling and the compiler takes care of the rest. And that is a problem with many class based languages, that a class can't work as a primitive, compare Java's int vs Integer. program TestType; type age = 0..150; procedure test(age:age); begin writeln(age); end; begin test(100); test(200); end.