Hello merry Yhc'ers, Doing my homework for the upcoming Hac07 event, I installed and ran Yhc for the first time over some code that has so far survived both Hugs and GHC. In the spirit of Hac07, I downloaded Yhc and built it from the darcs repository, as described on http://haskell.org/haskellwiki/Yhc/Building. All this happened on a PPC Mac OS X 10.4 using a ghc-6.4.1 that I had installed earlier. I also had darcs installed already. Other tools scons, subversion, python24 (and perhaps more? I cannot recall) I took from darwinports. All this with surprisingly few stumbles. But I do have some comments and questions. And understand, please, that the answers may be perfectly obvious. And that none of these items are preventing anything important from happening. Nevertheless, it would help me a lot if some expert would take just a quick look through the list and say something about each. Feel free to simply say "Supply additional information", "Fix the documentation yourself", or "Report a bug" as appropriate. Here is the list: 1. I compile HelloWorld.hs by "yhc HelloWorld" and it works fine. However, in contrast to the description on http://haskell.org/haskellwiki/Yhc/Tutorial, the result is deposited in Main.hbc and Main.hi, so to run it, I must use "yhi Main". "yhi HelloWorld" produces a complaint (ERROR: couldn't find module named 'HelloWorld'). 2. When invoking yhc and also yhi, it seems that I can add a lot of different suffixes to the module name and they are simply ignored. Thus, "yhi Main.xxx" works just as well as "yhi Main". Throwing my input silently away like this seems unfriendly, I would much prefer to get an error message. 3. On http://haskell.org/haskellwiki/Yhc/Options and also in the output from "yhc -?", I find "-d -dst str destination path for generated bytecode files (default=.)". This dosen't seem right: I the cases I have tried, the bytecode was placed in the same directory as the source. And adding "-d something" did not seem to have any effect. 4. I also tried the command line yhe. However, I had to go into yhc/src/interactive and figure out myself how to build it. It hadn't been built as part of the "normal" build process. (I should mention that I am not particularly interested in the GUI yhe and probably don't even have the installments needed to build it.) 5. Getting to some more meaty things, actually compiling some code, I get the message "Error: Context for Prelude.Num needed in left hand pattern at 98:19-98:23." referring to this line in the code: (x,c) = prpExponent (n-1) p In ghci, I find that prpExponent :: (Num b, Integral a) => a -> a -> (a, b) If I add prpExponent :: Integer -> Integer -> (Integer,Int) (I sinfully avoid these type specifications in many cases), the module compiles fine. In another case of this: (p2p1f2,0) = divMod (p2+1) p2p1f1 yhc reports "Error: Context for Prelude.Integral needed in left hand pattern at 88:3-88:12.". For this, ghci reports p2p1f2 :: Integer p2 :: Integer p2p1f1 :: Integer and I can add p2 :: Integer to fix the problem. I have additional examples of this, all of them involving a pair as left hand side, some of them requiring more elaborate (but less obvious) repairs. Any comments? 6. I get the message "Nothing derived for Id 424 at nopos" and similar messages with 424 replaced by other numbers when a number of modules are compiled. The modules seem to compile OK, however. What does this mean? 7. I have only really managed to execute toy programs. For one of my "real" programs (also a toy, but you know what I mean), I get Thorkil-Naurs-Computer:~/tn/test/Yhc/HASKELL1/tn/Haskell/Hugs thorkilnaur$ yhi Primtal ERROR: couldn't find module named '_Builtin' tried: _Builtin.hbc /Users/thorkilnaur/tn/YhcDarcsRepository/yhc/inst/lib/yhc/packages/yhc-base/1.0/_Builtin.hbc Thorkil-Naurs-Computer:~/tn/test/Yhc/HASKELL1/tn/Haskell/Hugs thorkilnaur$ and I cannot figure out how to solve this problem. Other of my programs also complain that '_Builtin' is missing. 8. Compiling another program, I get Thorkil-Naurs-Computer:~/tn/test/Yhc/HASKELL1/tn/Haskell/Hugs thorkilnaur$ yhc -I EuclidNormal FcbMStep yhc: Error: File not found, Time Reason: imported from Main Looked in: /Users/thorkilnaur/tn/test/Yhc/HASKELL1/tn/Haskell/Hugs/ . EuclidNormal /Users/thorkilnaur/tn/YhcDarcsRepository/yhc/inst/lib/yhc/packages/haskell98/1.0 /Users/thorkilnaur/tn/YhcDarcsRepository/yhc/inst/lib/yhc/packages/yhc-base/1.0 Thorkil-Naurs-Computer:~/tn/test/Yhc/HASKELL1/tn/Haskell/Hugs thorkilnaur$ I have done a very superficial investigation and it appears that it is certainly intended that Time should be included in the Yhc install. On the other hand, I cannot off hand find traces in the scons output that something related to Time has been built. I have similar problems with CPUTime. Please direct me. 9. Finally, I get a message "Error: Identifier getArgs used at 67:15-67:21 is not defined." when using that function in a Main module: args<-getArgs Please comment. Please complain if you think that I am wasting your time with trivia. I have been through most of the Wiki pages that I could find that were related to Yhc. I have also looked briefly over the bug list. Many thanks and best regards Thorkil