Create a variable right inside an expression

gistfile1.as

var a:Number = 1;
var b:Number = 2;
var c:Number = 3;
			
if((a = b + c) > 1)
{
	trace("!");
}
			
trace("a="+a);
trace("b="+b);
trace("c="+c);

/* результат
!
a=5
b=2
c=3
*/