problem with generator during eval

generator.php

<?php
// with         $this->serializer = $this->getMock('Symfony\Component\Serializer\SerializerInterface');
// the $code content into the eval($code) into phpunit/phpunit-mock-objects/PHPUnit/Framework/MockObject/Generator.php
class Mock_SerializerInterface_ec3da84e implements PHPUnit_Framework_MockObject_MockObject, JMS\Serializer\SerializerInterface
{
    private static $__phpunit_staticInvocationMocker;
    private $__phpunit_invocationMocker;

    public function __clone()
    {
        $this->__phpunit_invocationMocker = clone $this->__phpunit_getInvocationMocker();
    }

    public function serialize($data, $format, JMS\Serializer\SerializationContext $context = NULL)
    {
        $arguments = array($data, $format, $context);
        $count     = func_num_args();

        if ($count > 3) {
            $_arguments = func_get_args();

            for ($i = 3; $i < $count; $i++) {
                $arguments[] = $_arguments[$i];
            }
        }

        $result = $this->__phpunit_getInvocationMocker()->invoke(
          new PHPUnit_Framework_MockObject_Invocation_Object(
            'JMS\Serializer\SerializerInterface', 'serialize', $arguments, $this, FALSE
          )
        );

        return $result;
    }

    public function deserialize($data, $type, $format, JMS\Serializer\DeserializationContext $context = NULL)
    {
        $arguments = array($data, $type, $format, $context);
        $count     = func_num_args();

        if ($count > 4) {
            $_arguments = func_get_args();

            for ($i = 4; $i < $count; $i++) {
                $arguments[] = $_arguments[$i];
            }
        }

        $result = $this->__phpunit_getInvocationMocker()->invoke(
          new PHPUnit_Framework_MockObject_Invocation_Object(
            'JMS\Serializer\SerializerInterface', 'deserialize', $arguments, $this, FALSE
          )
        );

        return $result;
    }

    public function expects(PHPUnit_Framework_MockObject_Matcher_Invocation $matcher)
    {
        return $this->__phpunit_getInvocationMocker()->expects($matcher);
    }

    public static function staticExpects(PHPUnit_Framework_MockObject_Matcher_Invocation $matcher)
    {
        return self::__phpunit_getStaticInvocationMocker()->expects($matcher);
    }

    public function __phpunit_getInvocationMocker()
    {
        if ($this->__phpunit_invocationMocker === NULL) {
            $this->__phpunit_invocationMocker = new PHPUnit_Framework_MockObject_InvocationMocker;
        }

        return $this->__phpunit_invocationMocker;
    }

    public static function __phpunit_getStaticInvocationMocker()
    {
        if (self::$__phpunit_staticInvocationMocker === NULL) {
            self::$__phpunit_staticInvocationMocker = new PHPUnit_Framework_MockObject_InvocationMocker;
        }

        return self::$__phpunit_staticInvocationMocker;
    }

    public function __phpunit_hasMatchers()
    {
        return self::__phpunit_getStaticInvocationMocker()->hasMatchers() ||
               $this->__phpunit_getInvocationMocker()->hasMatchers();
    }

    public function __phpunit_verify()
    {
        self::__phpunit_getStaticInvocationMocker()->verify();
        $this->__phpunit_getInvocationMocker()->verify();
    }

    public function __phpunit_cleanup()
    {
        self::$__phpunit_staticInvocationMocker = NULL;
        $this->__phpunit_invocationMocker       = NULL;
    }
}