	xdefs[0] = 42
	xdefs[1] = 43
	xdefs[2] = 47
	xdefs[3] = 38
	xdefs[4] = 94
	[     ID] C
	[   INCR] ++
	[       ] * prec=27 node_id=1
	[     ID] hello
	[       ] / prec=25 node_id=3
	[       ] & prec=24 node_id=4
	[     ID] world
	[       ] ^ prec=23 node_id=5
