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

	//bugs propagation rule
	rule: (X: function, Y: function)
	case X call Y, - X tag suppress(bugs_propagation_warnings)
	{
	warning Y tag bug(no(No)) -> X tag bug(no(No))
	message "Function should declare bugs it aware of"
	}

	testfunc3 = function: (a: num, b: num)->num,unsafe, bug(no(1273)) //function tags list
	{
	x = a+b: num;
	y = a - b: num;

	(x + y) / 2;
	}

	testfunc2 = function: (a: num)->bool // because of testfunc3 marked as unsafe code,
	// testfunc2 should be marked so too
	,suppress(bugs_propagation_warnings), suppress(unsafe_propagation_warning)

	{
	b = testfunc3(a+1, a-1): num;
	(b==0);
	}