[Haskell-cafe] sharing

Hi, Is there currently a consensus on what is the best way to embed a pure dataflow language while keeping control over value sharing? I have a stream processing language that has a monadic interface (a -> b -> m c) to track variable sharing so it can compile down to C or Verilog, but I would like to create an expression interface layer on top (s a -> s b -> s c) that still allows me to recover the underlying monad representation to implement sharing. I got used to writing in monadic form but I really can't sell this to EEs... Other than a TH or syntax frontend, unsafe tricks, or Conal's compiling to categories which requires a plugin (I believe), is there another way? Cheers, Tom