[Haskell-cafe] ghci breakpoints

Hello, I'm having trouble setting breakpoints from ghci. I load the files and I can tell things are working correctly because I can run the program and list the locations where I want to set breakpoints. E.g. Prelude> :list Focus.focus 510 > focus :: forall s m. Class s m => Neg -> m [Foci] 511 > focus f = 512 > let ats = Path.atoms f But when I try to set a breakpoint I get Prelude> :break Focus.focus No breakpoints found at that location. Does anyone have ideas about what I'm doing wrong in this case? Do I need to load with some special options to have breakpoints work? Thanks, Sean