class c { has $.lb }

##</code><code>##

class c {
    has $!lb;
    #| Auto-generated if there's no explicit `lb` method: 
    method lb { $!lb }
}

##</code><code>##

class c { has $.lb is rw; } # note the `is rw`

##</code><code>##

class c {
    has $!lb;
    #| Auto-generated if there's no explicit `lb` method: 
    method lb is rw { $!lb } # note the `is rw`
}

##</code><code>##

my $container;
class c {
    #| `is rw` means return the container, not its value 
    method m is rw { $container }
};
my $o = c.new;
$o.m = 6;
say $container # prints `6`, the container's contents