Initial implementation

src/main/php/lang/GenericTypes.class.php

@@ -209,7 +209,9 @@ public function newType0($base, $arguments) {
             array_shift($state);
             array_unshift($state, 4);
             $src.= '{';
-
+            foreach ($placeholders as $placeholder => $type) {
+              $src.= 'static $'.$placeholder.'= "'.$type.'";';
+            }
             if (isset($annotations[0]['generic']['return'])) {
               $meta[1][$m][DETAIL_RETURNS]= strtr($annotations[0]['generic']['return'], $placeholders);
             }

src/test/php/net/xp_framework/unittest/core/generics/ImplementationTest.class.php

@@ -127,4 +127,10 @@ public function partiallyClosedNS() {
       Type::forName('net.xp_framework.unittest.core.generics.NSTypeLookup<string>')->getParentclass()
     );
   }
+
+  #[@test, @values([['', null], ['1', 1], ['Test', 'Test']])]
+  public function type_variable_available($expect, $value) {
+    $fixture= create('new net.xp_framework.unittest.core.generics.Unserializer<string>');
+    $this->assertEquals($expect, $fixture->newInstance($value));
+  }
 }

src/test/php/net/xp_framework/unittest/core/generics/Unserializer.class.php

@@ -0,0 +1,22 @@
+<?php namespace net\xp_framework\unittest\core\generics;
+
+use lang\Type;
+
+/**
+ * List of elements
+ */
+#[@generic(self= 'T')]
+class Unserializer extends \lang\Object {
+
+  /**
+   * Returns a list of all elements
+   *
+   * @param   var $arg
+   * @return  T element
+   */
+  #[@generic(return= 'T')]
+  public function newInstance($arg= null) {
+    $type= Type::forName($T);
+    return null === $arg ? $type->default : $type->newInstance($arg);
+  }
+}