You don't have to use builder, this also works:

has 'x' => (
    is => 'rw',
    isa => 'Str',
    default => sub {
        my ($self) = @_;
        return $self->value;
    },
    lazy => 1,
);

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In reply to Re^7: Moose Attribute Default Dependency by elTriberium
in thread Moose Attribute Default Dependency by dpath2o

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