Minor updates

backup/moodle2/restore_qtype_stack_plugin.class.php

@@ -296,7 +296,12 @@ class restore_qtype_stack_plugin extends restore_qtype_plugin {
                 foreach($questions as $q) {
                     $qnames[] = $q->name;
                 }
-               throw new coding_exception('The PRT named "' . $prt->name . '" is malformed in question id '.$prt->questionid.', question named "'.implode(', ',$qnames).'".');
+                if (count($roots) != 1) {
+                    $err = 'abnormal root count: '.count($roots).'(<>1)';
+                } else {
+                    $err = 'broken cycles: '.implode('.', $graph->get_broken_cycles());
+                }
+                throw new coding_exception('The PRT named "' . $prt->name . '" is malformed in question id '.$prt->questionid.', question named "'.implode(', ',$qnames).'".  Error reported: '.$err);
             }
             reset($roots);
             $firstnode = key($roots) - 1;

doc/en/Developer/Future_plans.md

@@ -48,7 +48,8 @@ The following features are in approximate priority order.  How to report bugs an
   * MapleTA
 * Possible Maxima packages:
  * Better support for rational expressions, in particular really firm up the PartFrac and SingleFrac functions with better support.
- * Package for scientific [units](../Authoring/Units.md), and a science answer test
+ * Package for scientific [units](../Authoring/Units.md), and a science answer test.
  * Support for inequalities.  This includes real intervals and sets of real numbers.
+ * Support for the "draw" package.