gc_refc.erl

-spec gc_count(non_neg_integer(), binary()) -> non_neg_integer().
gc_count(PreviousCounter, Bin) ->
    case byte_size(Bin) of
        N when N >= 64 -> % refc binary
            Count = N + PreviousCounter
            case Count >= ?THRESHOLD of
                true ->
                    erlang:garbage_collect(),
                    0;
               false ->
                   Count
            end;
        N -> % heap binary
            PreviousCounter+N
    end.

The variable 'Count' is unused.
The variable 'NewCount' is unbound.