private def Object compile(Exp e) {
		if(e.left !== null) {
			if (e.left instanceof Var){
				'''«(e.left as Var).compile»'''
			}
			else if (e.left instanceof Val) {
				'''«(e.left as Val).compile»'''
			}
			else {
				'''«(e.left as Exp).compile»''' //error 
				if(e.op == '[' || e.op == '(' || e.op == '.')
					'''«e.op»''' //error 
				else 
					''' «e.op» ''' //error
				
				if (e.right !== null)
					'''«(e.right as Exp).compile»'''
			}
		}
	}

a = b

a
=
b