y = 100;

          //Treat y as global variable
          function f() global(y)
          { 
            y = y - 1;
          }

          //Assign local variable with nearest value
          function f1()
          { 
            y = y - 1;
          }

          //Assign global variable with nearest value
          function f2()
          { 
            global:y = y - 1;
          }

          //Assign global variable with global value
          function f3()
          { 
            global:y = global:y - 1;
          }

          //Assign local variable with global value
          function f4()
          { 
            y = global:y - 1;
          }

          f(); 

Test.AreEqual(99, y);

          f1();

Test.AreEqual(99, y);

          f2();

Test.AreEqual(98, y);

          f3();

Test.AreEqual(97, y);

          f4();

Test.AreEqual(97, y);

function f7()
{
 y = 2;
 f1();
 Test.AreEqual(2, y);
}

f7();

Test.AreEqual(97, y);

function f8()
{
 y = 2;
 Test.AreEqual(2, y);

 f2();
 Test.AreEqual(1, y);
}

f8();

Test.AreEqual(97, y);

//Local scope changes global variable
{
 {
  y = 15;
 }
}

Test.AreEqual(15, y);

//Local scope create local variable
{
 {
  var y = 25;
 }
}

Test.AreEqual(15, y);