Blade directive not working

I'm using Laravel 5.6 and trying to define a blade directive (in the boot() method of the service provider):

Blade::directive('hello', function () {
        return "Hello, World!";
});

But in my views, when i write @hello it shows @hello instead of "hello world" as it should.

I've done artisan view:clear (and cache:clear too) but still no result.

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