Write ref in C#?

Question

C++ / C#

I remember exactly that in one of the announcements of the next version of C #, it slipped that now it is not necessary to write ref when passing parameters, that is, you can write like this:

void Test(ref int n) {}

void Action 
{
    int n = 4;
    Test(n); // вместо Test(ref n)
}

I then immediately checked this example and it worked.
But now, after some time, I can't find any information about it, and this code doesn't work (C# 7.3), why?
Found!
https://habr.com/post/113586/
This only works for some calls - "the ref keyword can be omitted when calling a method through COM Interop"

Answer 1

You are confusing something, the requirement, as it was, remains.