ContainerLoader - implode(): Invalid arguments passed

[f3l1x]

PHP: 7.0
nette/di: 2.4.0

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This snippet of code triggered error.

    $loader = new ContainerLoader(TEMP_DIR, TRUE);
    $class = $loader->load(function (Compiler $compiler) {
        $compiler->addExtension('a', new FoobarExtension);
    }, 'foobar');

   Exited with error code 255 (expected 0)
   E_WARNING: implode(): Invalid arguments passed

   in src/DI/ContainerLoader.php(119) 
   in src/DI/ContainerLoader.php(119) implode()
   in src/DI/ContainerLoader.php(82) Nette\DI\ContainerLoader->generate()
   in src/DI/ContainerLoader.php(47) Nette\DI\ContainerLoader->loadFile()

---

I think that problem might be here (double implode).

https://github.com/nette/di/blob/v2.4.0/src/DI/Compiler.php#L161
https://github.com/nette/di/blob/v2.4.0/src/DI/ContainerLoader.php#L119

---

Is it wrong usage or it is really bug? :-)

[f3l1x]

Thanks David :) @dg