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[Andrey]

>> MyStruct ms;
>> ms.a = 42; //!!!
>> writeln(ms.a);
>
>
> This is by design, not a bug. All code in a module has access 
> to all private members in that same module. This obviates the 
> need for the C++ "friend" declarations.

Wikipedia states:

«In general, encapsulation is one of the 4 fundamentals of OOP 
(object-oriented programming). Encapsulation is to hide the 
variables or something inside a class, preventing unauthorized 
parties to use.»

So how am I supposed to hide the variable inside the struct or 
class? I don't want anything to access it outside struct 
definition. And I don't see any point in giving the opportunity 
to access it using "friend" invitation. I'm sure "friend" 
explodes the basics of OOP encapsulation mechanics.

Struct is an «container» that owns its declarations and use 
special word for this: private. Then comes completely another 
data structure and can easily manipulate private members of 
another. Only imagine the other man from the neighbor house comes 
into your house and take your children without asking only 
because he lives on the same street.