System.err.println("   ...");
k$errout.file.println("   ...");
static void traceback(iClosure c, int n) {    if (c == null) {			// if end of the line	return;    }    if (n == 0) {			// if recursion limit reached	System.err.println("   ...");	return;    }    traceback(c.parent, n - 1);		// print ancestry first    System.err.println("   " + c.trace());  // report this closure}