fixed #1251

lists.js

@@ -62,7 +62,7 @@ CellMorph, ArrowMorph, MenuMorph, snapEquals, Morph, isNil, localize,
 MorphicPreferences, TableDialogMorph, SpriteBubbleMorph, SpeechBubbleMorph,
 TableFrameMorph, TableMorph, Variable, isSnapObject*/
 
-modules.lists = '2016-May-02';
+modules.lists = '2016-June-10';
 
 var List;
 var ListWatcherMorph;
@@ -387,9 +387,11 @@ List.prototype.becomeLinked = function () {
         stop = this.length();
         for (i = 0; i < stop; i += 1) {
             tail.first = this.contents[i];
-            tail.rest = new List();
-            tail.isLinked = true;
-            tail = tail.rest;
+            if (i < (stop - 1)) {
+                tail.rest = new List();
+                tail.isLinked = true;
+                tail = tail.rest;
+            }
         }
         this.contents = [];
         this.isLinked = true;

store.js

@@ -60,7 +60,7 @@ SyntaxElementMorph, Variable, isSnapObject, console, BooleanSlotMorph*/
 
 // Global stuff ////////////////////////////////////////////////////////
 
-modules.store = '2016-June-01';
+modules.store = '2016-June-10';
 
 
 // XML_Serializer ///////////////////////////////////////////////////////
@@ -1182,7 +1182,7 @@ SnapSerializer.prototype.loadValue = function (model) {
             record();
             lst = v;
             items = model.childrenNamed('item');
-            items.forEach(function (item) {
+            items.forEach(function (item, i) {
                 var value = item.children[0];
                 if (!value) {
                     v.first = 0;
@@ -1194,9 +1194,11 @@ SnapSerializer.prototype.loadValue = function (model) {
                 if (tail) {
                     v.rest = myself.loadValue(tail);
                 } else {
-                    v.rest = new List();
-                    v = v.rest;
-                    v.isLinked = true;
+                    if (i < (items.length - 1)) {
+                        v.rest = new List();
+                        v = v.rest;
+                        v.isLinked = true;
+                    }
                 }
             });
             return lst;