How to call private command method in Symfony ?

index.php

#!/usr/bin/env php
<?php

require __DIR__ . '/../../vendor/autoload.php';

use Castor\Console\Command\CompileCommand;
use Symfony\Component\Console\Application;
use Symfony\Component\Console\Command\Command;

// We extends the CompileCommand, to be able to remove the constructor, because
// it has some dependencies. We don't need them. So we don't want to pass them.
$command = (new class() extends CompileCommand {
        public function __construct() {
            // Don't call parent, cf above. But we need to call the Command
            // constructor.
            Command::__construct();
        }}
    )
    // Override the default `CompileCommand::execute()`
    // see https://github.com/symfony/symfony/blob/7.1/src/Symfony/Component/Console/Command/Command.php#L312
    ->setCode(
        // We bind the closure to the CompileCommand class, to be able to use
        // `$this` with `CompileCommand` scope. It means that we can use the
        // private method `CompileCommand::generatePHPBuildCacheKey()`
        Closure::bind(
            fn($input) =>
                // We can use the private method in the closure
                // `&& 0` is to force the return to be 0 (success) (otherwise it's the return of `print()` call)
                (print $this->generatePHPBuildCacheKey($input)) && 0,
            null,
            CompileCommand::class, // The class where the closure is bound
        )
    )
;

// Regular Symfony Single Command Application But there is also a
// SingleCommandApplication, but PHP class cannot extends two classes.
(new Application())
    ->add($command)
    ->getApplication()
    ->setDefaultCommand($command->getName(), true)
    ->run()
;