Allow Access modifiers for primary constructor parameters

[drowhunter]

As a TypeScript lover I think primary constructors would be cool if we could do something like this in C#

public class MyClass(
    string firstName,
    protected lastName,
    public age ) {

}

Usage

var obj = new MyClass("Bob","Dole", 123);

var a = obj.firstName  // error
var b = obj.lastName   // error
var c = obj.age        // 123

[huoyaoyuan]

You can use record if you want to make the primary constructor parameters public.