[Haskell-cafe] Prelude.head: empty list

In a rather large program I made some changes, and now I get the runtime error: ampersand.exe: Prelude.head: empty list Of course I know that head is partial, and should be used with care. It is used many times (we have 100+ modules in the program). Is there an elegant way to get some information about where the specific call to head is being made? Thanks!