diff --git a/lib/javascript/gflib.js b/lib/javascript/gflib.js
index 630c01a3d..194fe57db 100644
--- a/lib/javascript/gflib.js
+++ b/lib/javascript/gflib.js
@@ -3,12 +3,12 @@
 function Fun(name) {
 	this.name = name;
 }
-Fun.prototype.toString = function () { return this.show(0); } ;
+Fun.prototype.print = function () { return this.show(0); } ;
 Fun.prototype.show = function (prec) {
 	var s = this.name;
 	var cs = this.getChildren();
-	for (var c in cs) {
-		s += " " + c.show(1);
+	for (var i in cs) {
+		s += " " + cs[i].show(1);
 	}
 	if (prec > 0 && cs.length > 0) {
 		s = "(" + s + ")" ;
@@ -36,7 +36,7 @@ Fun.prototype.getChildren = function () {
 /* Hack to get around the fact that our SISR doesn't build real Fun objects. */
 function copyTree(x) {
 	if (typeof x == 'string' && x == '?') {
-		return '?';
+		return new Fun('?');
 	} else {
 		var t = new Fun(x.name);
 		for (var i = 0; ; i++) {
@@ -116,7 +116,7 @@ Linearizer.prototype.rule = function (name, cs) { return this.rules[name](cs); }
 Linearizer.prototype.addRule = function (name, f) { this.rules[name] = f; };
 Linearizer.prototype.linearize = function (tree) { return this.linearizeToTerm(tree).print(); };
 Linearizer.prototype.linearizeToTerm = function (tree) {
-	if (typeof tree == 'string' && tree == '?') {
+	if (tree.name == '?') {
 		return new Meta();
 	} else {
 		var cs = tree.getChildren();