I've noticed a couple of very minor issues with GHC[i]: (1) unhelpful error message from GHCi: [[ Compiling ParsecPrim ( F:\Haskell\Lib/ParsecPrim.hs, interpreted ) WARNING: ignoring polymorphic case in interpreted mode. Possibly due to strict polymorphic/functional constructor args. Your program may leak space unexpectedly. ]] I don't understand what this is trying to say, and the lack of a source code line number doesn't give me any chance to study the code for clues. This warning is GHCi only. (2) Strange behaviour of GHCs Time.diffClockTimes function: This code fragment: [[ runTest t = do { st <- Time.getClockTime ; putStr $ "Test started: "++show st++"\n" ; runTestTT t ; ft <- Time.getClockTime ; putStr $ "Test finished: "++show ft++"\n" ; let et = Time.diffClockTimes ft st ; putStr $ "Test duration: "++show et++"\n" } ]] yields this output: [[ Test duration: TimeDiff {tdYear = 0, tdMonth = 0, tdDay = 0, tdHour = 0, tdMin = 0, tdSec = 9, tdPicosec = -437000000000} ]] In particular, tdSec and tdPicosec have different signs. I don't see what reasonable implementation would yield such a result. I've observed this with programs running interactively under GHCi, and also stand-alone executables. These tests using GHC 5.04.3, on Windows 2000. #g -- BTW, I found the GHC profiler to be very useful, and easy to use. I'm impressed! ------------------- Graham Klyne <GK@NineByNine.org> PGP: 0FAA 69FF C083 000B A2E9 A131 01B9 1C7A DBCA CB5E