@define domatch(e)
{
	switch(e){
	@match #id('x):
		printf("matched x!\n");
		break;
	@match #add(x, y):
		printf("matched add!\n");
		break;
	@match #sub(x, y):
		printf("matched sub!\n");
		break;
	default:
		printf("no match\n");
		break;
	}
}


domatch(#id('x));
domatch(#id('y));
domatch(#add(#id('x), #id('y)));
domatch(#sub(#id('x), #id('y)));