I recently upgraded from GHC 6.8.2 to GHC 6.10.4 and can no longer set breakpoints the way I'm used to. It seems I can only set breakpoints in the current module. I Googled around and found someone with a similar error message trying to load modules which aren't interpreted, but that's not the case for me as all modules are interpreted. Here's me loading the TypeInference module (where I want to set the breakpoint) directly and having it work. Then I load the Main module and try to set the breakpoint in TypeInference with no luck. Am I setting breakpoints wrong here? Any help would be appreciated. Cheers, Mike GHCi, version 6.10.4: http://www.haskell.org/ghc/ :? for help Loading package ghc-prim ... linking ... done. Loading package integer ... linking ... done. Loading package base ... linking ... done. Prelude> :l TypeInference [1 of 3] Compiling Utility ( Utility.lhs, interpreted ) [2 of 3] Compiling Parser ( Parser.hs, interpreted ) Parser.hs:1897:1: Warning: Pattern match(es) are overlapped In a case alternative: _ -> ... [3 of 3] Compiling TypeInference ( TypeInference.lhs, interpreted ) Ok, modules loaded: Parser, TypeInference, Utility. *TypeInference> :break 823 Breakpoint 0 activated at TypeInference.lhs:823:10-14 *TypeInference> :l Main [1 of 7] Compiling Utility ( Utility.lhs, interpreted ) [2 of 7] Compiling Parser ( Parser.hs, interpreted ) Parser.hs:1897:1: Warning: Pattern match(es) are overlapped In a case alternative: _ -> ... [3 of 7] Compiling TypeInference ( TypeInference.lhs, interpreted ) [4 of 7] Compiling Bounds ( Bounds.lhs, interpreted ) [5 of 7] Compiling Interpreter ( Interpreter.lhs, interpreted ) [6 of 7] Compiling PatternMatching ( PatternMatching.lhs, interpreted ) [7 of 7] Compiling Main ( Main.lhs, interpreted ) Ok, modules loaded: Parser, TypeInference, Utility, Main, Bounds, PatternMatching, Interpreter. *Main> :break TypeInference 823 No breakpoints found at that location. *Main>