Let's start with the code.

sub calc_meta_scan
{
    my $self = shift;

    $self->chosen_scans([]);

    $self->total_boards_solved(0);
    $self->total_iters(0);

    $self->status("iterating");
    my $quotas = [ @{$self->get_quotas()} ];
    # $self->inspect_quota() throws ::Error::OutOfQuotas if
    # it does not have any available quotas.
    try
    {
        while ($self->status() eq "iterating")
        {
            $self->inspect_quota($quotas);
        }
    }
    catch Shlomif::FCS::CalcMetaScan::Error::OutOfQuotas with
    {
    }
}