unsafe-code.xreate
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	//unsafe code propagation rule
	rule: (X: function, Y: function)
	case X call Y
	{
	warning Y tag unsafe -> X tag unsafe
	message "safe function should not call unsafe code"
	}

	testfunc3 = function: (a: num, b: num)->num , unsafe //function tags list
	{
	x = a+b: num;
	y = a - b: num;

	(x + y) / 2;
	}

	testfunc2 = function: (a: num)->bool // since testfunc3 marked as unsafe code,
	// testfunc2 should be marked so too
	{
	b = testfunc3(a+1, a-1): num;
	(b==0);
	}