Allowed for empty arrays and trailing commas

scripts/trailing.toy

@@ -0,0 +1,12 @@
+//test trailing commas
+var a = [1, 2, 3, ];
+
+print a;
+
+//test empty arrays
+var b = [];
+
+print b;
+
+//deep
+assert [[1, 2, 3],[4,99,6],[7,8,9]], "2-D array failed";