MDL-41787 make sure maturity constants are defined before they are used in core_component class

lib/classes/component.php

@@ -24,6 +24,20 @@
 
 defined('MOODLE_INTERNAL') || die();
 
+// Constants used in version.php files, these must exist when core_component executes.
+
+/** Software maturity level - internals can be tested using white box techniques. */
+define('MATURITY_ALPHA',    50);
+/** Software maturity level - feature complete, ready for preview and testing. */
+define('MATURITY_BETA',     100);
+/** Software maturity level - tested, will be released unless there are fatal bugs. */
+define('MATURITY_RC',       150);
+/** Software maturity level - ready for production deployment. */
+define('MATURITY_STABLE',   200);
+/** Any version - special value that can be used in $plugin->dependencies in version.php files. */
+define('ANY_VERSION', 'any');
+
+
 /**
  * Collection of components related methods.
  */
@@ -268,6 +282,7 @@ $cache = '.var_export($cache, true).';
     protected static function fetch_core_version() {
         global $CFG;
         if (self::$version === null) {
+            $version = null; // Prevent IDE complaints.
             require($CFG->dirroot . '/version.php');
             self::$version = $version;
         }

lib/setuplib.php

@@ -51,19 +51,6 @@ define('MEMORY_EXTRA', -3);
 /** Extremely large memory limit - not recommended for standard scripts */
 define('MEMORY_HUGE', -4);
 
-/**
- * Software maturity levels used by the core and plugins
- */
-define('MATURITY_ALPHA',    50);    // internals can be tested using white box techniques
-define('MATURITY_BETA',     100);   // feature complete, ready for preview and testing
-define('MATURITY_RC',       150);   // tested, will be released unless there are fatal bugs
-define('MATURITY_STABLE',   200);   // ready for production deployment
-
-/**
- * Special value that can be used in $plugin->dependencies in version.php files.
- */
-define('ANY_VERSION', 'any');
-
 
 /**
  * Simple class. It is usually used instead of stdClass because it looks