MDL-33952 Assignment - bon voyage!

mod_assignment has been replaced with a stub that only exists to support restoring and
auto upgrading to mod_assign. If you require mod_assignment for some old plugin, then
overwrite with the 2.6 version manually.

mod/assignment/classes/plugininfo/assignment.php

@@ -29,7 +29,17 @@ defined('MOODLE_INTERNAL') || die();
 
 
 class assignment extends base {
-    public function is_uninstall_allowed() {
+    /**
+     * Returns the information about plugin availability
+     *
+     * True means that the plugin is enabled. False means that the plugin is
+     * disabled. Null means that the information is not available, or the
+     * plugin does not support configurable availability or the availability
+     * can not be changed.
+     *
+     * @return null|bool
+     */
+    public function is_enabled() {
         return false;
     }
 }