anchor.diff:             ,Add#(1, b__, TLog#(TAdd#(1, n))));
      module mkStreamGearboxUp(StreamGearbox#(n, m));
         let verbose = False;
  -      FIFOF#(ByteStream#(n)) in_ff <- mkSizedFIFOF(2);
  -      FIFOF#(ByteStream#(m)) out_ff <- mkSizedFIFOF(2);
  +      FIFOF#(ByteStream#(n)) in_ff <- mkFIFOF;
  +      FIFOF#(ByteStream#(m)) out_ff <- mkFIFOF;
         Reg#(Bool) inProgress <- mkReg(False);
         Reg#(Bool) oddBeat    <- mkReg(True);
         Reg#(ByteStream#(n)) v_prev <- mkReg(defaultValue);
  
positive.code:       let clock <- exposeCurrentClock();
        let reset <- exposeCurrentReset();
  
        FIFO#(ByteStream#(n)) in_ff <- mkFIFO;
        FIFO#(ByteStream#(m)) out_ff <- mkFIFO;
        Gearbox#(2, 1, ByteStream#(m)) fifoTxData <- mkNto1Gearbox(clock, reset, clock, reset);
  
        function Vector#(2, ByteStream#(m)) split(ByteStream#(n) in);
  
negative.code: import GetPut::*;
  import FIFO::*;
  import FIFOF::*;
  import BRAMFIFO::*;
  import Vector::*;
  import Stream::*;
  import Gearbox::*;
  