Cro::HTTP::Server doesn't provide means to handle listener errors

[vrurg]

There is no way to tell if a Cro server instance can't start due to an error. Taking an example from the documentation and changing the port so that it'd fail under a non-root account would be a good example:

my $application = route {
    get -> {
        content 'text/html', '<strong>Hello, world!</strong>';
    }
}
my Cro::Service $hello-service = Cro::HTTP::Server.new(
    :host('localhost'), :port(80), :$application
);
$hello-service.start;

It ends up with LTA message:

permission denied

And I can't even locate where exactly the message is printed.