it should correctly handle expression control structures
==========
{
	_locals:
	{
		doBubba: true,
		doGump: false,
		num: 3
	}
}
==========
ONE
{if doBubba}
	BUBBA
{/if}
{if doGump}
	GUMP
{/if}
{else}
	NO GUMP
{/else}
{for var i=0; i<3; i++}
	Yo ${i}
{/for}
THREE
{while num--}
	Zo ${num}
{/while}
{for var x=0; x<2; x++}
	{for var y=0; y<2; y++}
		p(${x}, ${y})
	{/for}
{/for}
==========
ONE
BUBBA
NO GUMP
Yo 0
Yo 1
Yo 2
THREE
Zo 2
Zo 1
Zo 0
p(0, 0)
p(0, 1)
p(1, 0)
p(1, 1)