diff --git a/lib/form/dateselector.php b/lib/form/dateselector.php
index 76f3a2e1558..29957e3d904 100644
--- a/lib/form/dateselector.php
+++ b/lib/form/dateselector.php
@@ -80,6 +80,7 @@ class MoodleQuickForm_date_selector extends MoodleQuickForm_group {
         $calendartype = \core_calendar\type_factory::get_calendar_instance();
         $this->_options = array('startyear' => $calendartype->get_min_year(), 'stopyear' => $calendartype->get_max_year(),
             'defaulttime' => 0, 'timezone' => 99, 'step' => 5, 'optional' => false);
+        // TODO MDL-52313 Replace with the call to parent::__construct().
         HTML_QuickForm_element::__construct($elementName, $elementLabel, $attributes);
         $this->_persistantFreeze = true;
         $this->_appendName = true;
diff --git a/lib/form/datetimeselector.php b/lib/form/datetimeselector.php
index 9f27cbd7bd5..8055f026e6f 100644
--- a/lib/form/datetimeselector.php
+++ b/lib/form/datetimeselector.php
@@ -83,6 +83,7 @@ class MoodleQuickForm_date_time_selector extends MoodleQuickForm_group {
         $this->_options = array('startyear' => $calendartype->get_min_year(), 'stopyear' => $calendartype->get_max_year(),
             'defaulttime' => 0, 'timezone' => 99, 'step' => 5, 'optional' => false);
 
+        // TODO MDL-52313 Replace with the call to parent::__construct().
         HTML_QuickForm_element::__construct($elementName, $elementLabel, $attributes);
         $this->_persistantFreeze = true;
         $this->_appendName = true;
diff --git a/lib/form/duration.php b/lib/form/duration.php
index 7c29757b67b..ab2d43462ac 100644
--- a/lib/form/duration.php
+++ b/lib/form/duration.php
@@ -64,6 +64,7 @@ class MoodleQuickForm_duration extends MoodleQuickForm_group {
     * @param mixed $attributes Either a typical HTML attribute string or an associative array
     */
     public function __construct($elementName = null, $elementLabel = null, $options = array(), $attributes = null) {
+        // TODO MDL-52313 Replace with the call to parent::__construct().
         HTML_QuickForm_element::__construct($elementName, $elementLabel, $attributes);
         $this->_persistantFreeze = true;
         $this->_appendName = true;
diff --git a/lib/form/modgrade.php b/lib/form/modgrade.php
index 19c3ee08167..dd8ccce6fe1 100644
--- a/lib/form/modgrade.php
+++ b/lib/form/modgrade.php
@@ -54,6 +54,7 @@ class MoodleQuickForm_modgrade extends MoodleQuickForm_group{
      * @param mixed $attributes Either a typical HTML attribute string or an associative array
      */
     public function __construct($elementname = null, $elementlabel = null, $options = array(), $attributes = null) {
+        // TODO MDL-52313 Replace with the call to parent::__construct().
         HTML_QuickForm_element::__construct($elementname, $elementlabel, $attributes);
         $this->_persistantFreeze = true;
         $this->_appendName = true;
diff --git a/lib/form/modvisible.php b/lib/form/modvisible.php
index 99fca08a561..ddc4a6fba94 100644
--- a/lib/form/modvisible.php
+++ b/lib/form/modvisible.php
@@ -49,6 +49,7 @@ class MoodleQuickForm_modvisible extends MoodleQuickForm_select{
      * @param array $options ignored
      */
     public function __construct($elementName=null, $elementLabel=null, $attributes=null, $options=null) {
+        // TODO MDL-52313 Replace with the call to parent::__construct().
         HTML_QuickForm_element::__construct($elementName, $elementLabel, $attributes, null);
         $this->_type = 'modvisible';
     }
diff --git a/lib/form/selectyesno.php b/lib/form/selectyesno.php
index 8ccf82b87c4..7764fbb94e8 100644
--- a/lib/form/selectyesno.php
+++ b/lib/form/selectyesno.php
@@ -48,6 +48,7 @@ class MoodleQuickForm_selectyesno extends MoodleQuickForm_select{
      * @param mixed $options ignored, not used.
      */
     public function __construct($elementName=null, $elementLabel=null, $attributes=null, $options=null) {
+        // TODO MDL-52313 Replace with the call to parent::__construct().
         HTML_QuickForm_element::__construct($elementName, $elementLabel, $attributes, null);
         $this->_type = 'selectyesno';
         $this->_persistantFreeze = true;
diff --git a/lib/formslib.php b/lib/formslib.php
index ef8646bce34..6192514b917 100644
--- a/lib/formslib.php
+++ b/lib/formslib.php
@@ -1441,6 +1441,7 @@ class MoodleQuickForm extends HTML_QuickForm_DHTMLRulesTableless {
 
         static $formcounter = 1;
 
+        // TODO MDL-52313 Replace with the call to parent::__construct().
         HTML_Common::__construct($attributes);
         $target = empty($target) ? array() : array('target' => $target);
         $this->_formName = $formName;
diff --git a/lib/pear/HTML/QuickForm/date.php b/lib/pear/HTML/QuickForm/date.php
index 12478376e33..c0090e49993 100644
--- a/lib/pear/HTML/QuickForm/date.php
+++ b/lib/pear/HTML/QuickForm/date.php
@@ -267,6 +267,7 @@ class HTML_QuickForm_date extends HTML_QuickForm_group
     * @param    mixed   Either a typical HTML attribute string or an associative array
     */
     public function __construct($elementName = null, $elementLabel = null, $options = array(), $attributes = null) {
+        // TODO MDL-52313 Replace with the call to parent::__construct().
         HTML_QuickForm_element::__construct($elementName, $elementLabel, $attributes);
         $this->_persistantFreeze = true;
         $this->_appendName = true;
diff --git a/lib/pear/HTML/QuickForm/hiddenselect.php b/lib/pear/HTML/QuickForm/hiddenselect.php
index 0dc8721edc4..acafa4f90eb 100644
--- a/lib/pear/HTML/QuickForm/hiddenselect.php
+++ b/lib/pear/HTML/QuickForm/hiddenselect.php
@@ -50,6 +50,7 @@ class HTML_QuickForm_hiddenselect extends HTML_QuickForm_select
      * @return    void
      */
     public function __construct($elementName=null, $elementLabel=null, $options=null, $attributes=null) {
+        // TODO MDL-52313 Replace with the call to parent::__construct().
         HTML_QuickForm_element::__construct($elementName, $elementLabel, $attributes);
         $this->_persistantFreeze = true;
         $this->_type = 'hiddenselect';
diff --git a/lib/pear/HTML/QuickForm/hierselect.php b/lib/pear/HTML/QuickForm/hierselect.php
index ac34db2609d..37622297d03 100644
--- a/lib/pear/HTML/QuickForm/hierselect.php
+++ b/lib/pear/HTML/QuickForm/hierselect.php
@@ -115,6 +115,7 @@ class HTML_QuickForm_hierselect extends HTML_QuickForm_group
      * @return    void
      */
     public function __construct($elementName=null, $elementLabel=null, $attributes=null, $separator=null) {
+        // TODO MDL-52313 Replace with the call to parent::__construct().
         HTML_QuickForm_element::__construct($elementName, $elementLabel, $attributes);
         $this->_persistantFreeze = true;
         if (isset($separator)) {
diff --git a/lib/pear/HTML/QuickForm/link.php b/lib/pear/HTML/QuickForm/link.php
index 570aba8a426..72787405828 100644
--- a/lib/pear/HTML/QuickForm/link.php
+++ b/lib/pear/HTML/QuickForm/link.php
@@ -58,6 +58,7 @@ class HTML_QuickForm_link extends HTML_QuickForm_static
      * @throws    
      */
     public function __construct($elementName=null, $elementLabel=null, $href=null, $text=null, $attributes=null) {
+        // TODO MDL-52313 Replace with the call to parent::__construct().
         HTML_QuickForm_element::__construct($elementName, $elementLabel, $attributes);
         $this->_persistantFreeze = false;
         $this->_type = 'link';
diff --git a/lib/pear/HTML/QuickForm/radio.php b/lib/pear/HTML/QuickForm/radio.php
index ef00cfe24da..b3569fdf500 100644
--- a/lib/pear/HTML/QuickForm/radio.php
+++ b/lib/pear/HTML/QuickForm/radio.php
@@ -58,6 +58,7 @@ class HTML_QuickForm_radio extends HTML_QuickForm_input
      * @return    void
      */
     public function __construct($elementName=null, $elementLabel=null, $text=null, $value=null, $attributes=null) {
+        // TODO MDL-52313 Replace with the call to parent::__construct().
         HTML_QuickForm_element::__construct($elementName, $elementLabel, $attributes);
         if (isset($value)) {
             $this->setValue($value);