rem: Node *nodealloc(n)
add: nodealloc(int n)
context: Node *nodealloc(n){	register Node *x;	x = (Node *) malloc(sizeof(Node) + (n-1)*sizeof(Node *));	if (x == NULL)		ERROR "out of space in nodealloc" FATAL;	x->nnext = NULL;	x->lineno = lineno;	return(x);}