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class c { has $.lb }

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

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

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

my $container;
class c {
...
my $o = c.new;
$o.m = 6;
say $container # prints `6`, the container's contents