Add tests of __clone

tests/classes/clone_001.php

@@ -0,0 +1,20 @@
+<?php
+namespace classes\clone_001;
+
+class A {
+  var $p;
+
+  public function __construct(&$var) {
+    $this->p =& $var;
+  }
+}
+
+function test() {
+  $var = 42;
+  $a = new A($var);
+  $b = clone $a;
+  $var = 24;
+  echo $b->p;
+}
+
+test();

tests/transformations/skippass_001.php

@@ -73,6 +73,23 @@ class A {
     $this->p =& $p;
     $this->foo5($p);
   }
+
+  // Modification in __clone
+
+  public function __clone() {
+    $this->p = 666;
+  }
+
+  private function foo6($p) {
+    $that = clone $this;
+    echo $p;
+  }
+
+  public function test6() {
+    $p = 42;
+    $this->p =& $p;
+    $this->foo6($p);
+  }
 }
 
 (new A)->test1();
@@ -84,3 +101,5 @@ echo "\n";
 (new A)->test4();
 echo "\n";
 (new A)->test5();
+echo "\n";
+(new A)->test6();