use Kavorka;

fun my_func(Str :$message!, Bool :$newline) {
    print "Message received: $message";
    print "\n" if $newline;
}

my_func(message => 'x');
my_func(message => 'y', newline => 1);
my_func({message => 'z'});

my_func();
# Named parameter `message` is required
my_func(message => do { require DateTime; DateTime->now });
# Reference bless( {...) did not pass type constraint "Str"