@{ 
  num  = `constant 21;
  test = `expression 2 * 10;
  nil;
}

int x = @{`expression 2 * @num;};

int main() {
  int i = @(`expression 2 * @num);
  int y = @test;
  int a = @{ 
            num  = `constant 21;
            test =  2;
            `expression 2 * @num;
          };
  return 0;
}