Laravel 5.3.19 Illuminate\Support\Str::class error syntax error, unexpected ';'

I got error when i use Str from Alliases

Aliases Declaration:

    'Str' => Illuminate\Support\Str::class,

Usages:

<p></p>

Error Type:

FatalErrorException in aae7b22b68f86ae3874e1bac917a810813cbf059.php line 380: syntax error, unexpected ';'

via Chebli Mohamed