[Haskell-cafe] Function code generation (Template Haskell).

The task is that I have some function and I need to create another function alongside with it. The second function is based on first one. As a matter of fact, I already did this with Template Haskell. TH is quite good at that task, because I can load my module in ghci and have both functions available for experiments. I just wondering, is it possible to use newly introduced ghc plugins to do something like that? Could I create new functions while inspecting defined ones? Will they be visible in ghci?