Aum Syntax Samples: constrained domains

Working on contrained types(domains) idea, proposed syntax:
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use RTL;

scope Test begin

//Domain with constrain

public domain HumanAge(int)
{
value >= 0 and value <= 150; }

public static class Program1 begin

public method Main

{

Console.WriteLine("Hello Delphi days!");

Console.ReadLine();

Console.WriteLine("About to crash");

var age: HumanAge;

age = 500; // CRASH!!!!!! Domain is constrained and did not pass validation

}

end;

end;