Inherited __clone is not called

[quasilyte]

<?php

class Foo {
  private final function __clone() {
    var_dump(__METHOD__);
  }
}

class Bar extends Foo {
}

$x = new Bar();
$_ = clone $x;

PHP: runtime error: Call to private Foo::__clone()
KPHP: no errors, default (?) cloning is performed

The final private __clone is a trick to make objects non-cloneable.

Note: even if we make the __clone() public (final is irrelevant), it's not going to be called from the derived objects.

<?php

class Foo {
  public function __clone() {
    var_dump(__METHOD__);
  }
}

class Bar extends Foo {}
class Baz extends Bar {}

$x = new Baz();
$_ = clone $x;

PHP: prints "Foo::__clone"
KPHP: prints nothing

[tolk-vm]

The following test could be used in the future, when fixing this issue:

@ok
<?php

class Base1 {
    function __clone() { echo "base1 clone\n"; }
}

class Child1 extends Base1 {
    function cMethod() { echo "cMethod\n"; }
}

class Grand1 extends Base1 {
    function gMethod() { echo "gMethod\n"; }
}

(clone new Child1)->cMethod();
(clone new Grand1)->gMethod();


class Base2 {
    function __clone() { echo "base2 clone\n"; }
}

class Child2 extends Base2 {
    function cMethod() { echo "cMethod\n"; }
}

class Grand2 extends Base2 {
    function gMethod() { echo "gMethod\n"; }
    function __clone() { echo "grand2 clone\n"; }
}

(clone new Child2)->cMethod();
(clone new Grand2)->gMethod();


class Base3 {
    function __clone() { echo "base3 clone\n"; }
}

class Child3 extends Base3 {
    function cMethod() { echo "cMethod\n"; }
}

class Grand3 extends Base3 {
    function gMethod() { echo "gMethod\n"; }
    function __clone() { echo "grand3 clone\n"; parent::__clone(); }
}

(clone new Child3)->cMethod();
(clone new Grand3)->gMethod();