```
my @unreachable;
foreach my $multistate (values(%{$pkg_stash->{'__BITS_HS__'}})) {
     my $exists = $pkg_stash->{'__MULTISTATES__'}{$multistate->{'bit'}}; # Try to find "empty" multistate
     unless ($exists) {
        foreach (keys(%{$pkg_stash->{'__MULTISTATES__'}})) {
            if (($_ & 2**$multistate->{'bit'})) {
                 $exists = TRUE;
                 last;
            }
        }
     }
     push(@unreachable, $multistate) unless $exists;
}
throw .... if @unreachable;
```