Test Double code generator does not handle new expressions inside parameter default values

[maxm86545]

Q	A
PHPUnit version	9.5.18
PHP version	8.1.2
Installation Method	Composer

Summary

createMock is not working with new in initializers

Current behavior

Tests fail with an incomprehensible error:

PHP Fatal error: Constant expression contains invalid operations in /var/www/html/app/vendor/phpunit/phpunit/src/Framework/MockObject/MockClass.php(51) : eval()'d code on line 9

How to reproduce

class MyClass {
    public static function create(Example $example = new Example()) {
    // ...
    }
}

    // ...

    public function testSome(): void
    {
        $this->createMock(MyClass::class); // <--- PHP Fatal error
    }

    / ...

Expected behavior

Mock is created successfully.

[sebastianbergmann]

@nikic Am I missing something or are string operations on the return value of ReflectionParameter::__toString() really the only way to access the information we need here through the Reflection API?