[Haskell] Getting a function dependency graph from source

Hello. This seems like a basic question, but I haven't been able to find an answer. I have a pile of Haskell code that is compiled into a library, and a Haskell program that uses this library. What I would like is something that will look at my program and follow the function calls until it gets to the Prelude. I want to know which functions in the library and in the Prelude actually get used (at least potentially). I believe Hat only looks at traces of an actual run of the program, and so doesn't quite give me what I want. I also think I could do this with the haskell-src library, but it looks like a lot of work to understand that and use it. Thanks. -- Durward McDonell durward.mcdonell@jhuapl.edu