- Glasgow-haskell-users

hyperlinked GHC v6.6 grammar (just syntax part)
by Peter Hercek 19 Aug '07

19 Aug '07

Brandon Michael Moore wrote: > How hard is it to make another grammar? It would be very nice if parser > generators could make a page like this. Have you seen the program > BNFC (The BNF Converter)? It tries to generate some nicely-formatted > TeX documentation of the grammar, this could be even more useful. It is not complicated provided that I have a nicely formated EBNF grammar to start with. I agree it would be great if parser generators do this, but there may not be enough interest and I do not have time to do it all myself. I can provide assistance and some code to start with though. Could be worth a license change too. ANTLR generated a hyperlinked grammar description when generating a parser but it does not contain the backward links. When I contacted the authors there was not really an interest there. I checked out the BNFC report. Looks interesting. Though, it was not clear from it whether one can generate hyperlinked html version of the grammar from the TeX source. Do you know it? > No worries there, if there's anything to be sorry about it's depriving > people not on ghc-users of such a nifty. If you really want to apologize > you could make another with the grammar of GHC Haskell :) I added GHC v6.6 grammar. Only the syntax. Check http://www.hck.sk/users/peter/ and the notes at the end of the grammar to see what was changed. Peter.

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ANNOUNCE: Bamse 1.0
by Sigbjorn Finne 17 Aug '07

17 Aug '07

Galois is pleased to announce the first public release of Bamse, a Windows Installer creator framework written in Haskell. Using Bamse, you can easily create applications that let you build Windows Installer (MSIs) for your project's product deliverables. The tool was written quite a while ago (4-5 years) as an internal tool at Galois to help the automated building of shippable bundles for Windows platforms, but has also been used for GHC installers since version 5.0.x (and other Haskell-related tools, interpreters and packages.) The source code + support package is available from http://galois.com/~sof/bamse/ Remarks/notes: - the source code is covered by a BSD license. - questions, bug reports to sof(a)galois.com / sof(a)forkIO.com (*) - If someone would like to adopt and extend the code to make it even more useful, feel free to dive in and hack. (Integrate it into the building of Cabal source and binary dists, perhaps..?) - If there's genuine interest, the code could be made available via a repo ( (*) being the main reason not to right now.) Enjoy --sigbjorn (*) - I'm in the middle of moving to another tectonic plate, so e-mail responses might be slower than usual for the next couple of weeks.

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hyperlinked haskell 98 grammar
by Peter Hercek 16 Aug '07

16 Aug '07

Hi, I was improving my Haskell knowledge lately and I created a small dhtml application which allows browsing of Haskell 98 grammar. I contains both forward and backward hyperlinks. By backward hyperlink I mean that you can click on an a production head and you get a popup list box where you can navigate to any production using the nonterminal. If you like it please save and use your local copy since the server cannot handle much load. http://www.hck.sk/users/peter/ Peter.

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Display problem with ghci (:e) and vim
by Peter Ilberg 16 Aug '07

16 Aug '07

Hello! I've noticed an odd display problem with ghci and vim. The problem occurs with ghci-6.6 and vim-6 on Mac OS X 10.4.9 (Terminal.app and uxrvt in X11.app) and with ghci-6.2.2, ghci-6.6.1 and vim-7.0 on OpenBSD 4.1 (via PuTTY from Windows). 1 - Resize your terminal window to 40 lines. 2 - Start ghci. 3 - :set editor vim 4 - :edit File.hs (pick an existing file) Vim doesn't display the file contents properly in the bottom half of my terminal window (it doesn't display parts of the file). But it does correctly display the : command line at the bottom of the screen. Refreshing the display with Ctrl-L does not help. Infact, it makes things worse in some cases. Resizing the window with the mouse, or by typing resize, or by export LINES=40 does not help either. I don't see this problem under any of these configurations if I use hugs instead of ghci. Has anyone noticed this as well? Is there a workaround? (other than using hugs) Thanks, -- Peter

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Change to deriving in 6.7 ??
by Conal Elliott 16 Aug '07

16 Aug '07

I'm running ghc-6.7.20070802 and getting a new error message that didn't show up with ghc-6.6. Code: -- | Pairing for unary type constructors. newtype Pair1 f g a = Pair1 {unPair1 :: (f a, g a)} deriving (Eq, Ord, Show) Error message: src/Data/Tupler.hs:26:0: No instances for (Show (g a), Show (f a)) arising from the 'deriving' clause of a data type declaration at src/Data/Tupler.hs:(26,0)-(27,25) Possible fix: add an instance declaration for (Show (g a), Show (f a)) When deriving the instance for (Show (Pair1 f g a)) Has there been a change to "deriving"? Is there a workaround? Thanks, - Conal

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-optl doesn't seem to pass to ld (on Windows)
by Alistair Bayley 16 Aug '07

16 Aug '07

-optl--enable-stdcall-fixup With ghc-6.6.1 on WinXP, I want to pass --enable-stdcall-fixup (or --disable-stdcall-fixup, depending on my mood) to ld, but either the -optl option doesn't seem to work, or I've misunderstood what it's meant to do. ghc -v indicates that it is not in the parameters passed to ld.exe. Alistair

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setting the default package path
by Lars Oppermann 15 Aug '07

15 Aug '07

Hi all, I'm quite new to Haskell and GHC, please accept my apologies if I have missed something obvious in the FAQ/Documentation... On Windows, using the binary distribution of GHC Cabal packages are, by default, placed into C:\Program FIles\Haskell - if the --prefix option is not used when configuring the package in order to indicate some other location. Can I change this default location? Thanks, Lars -- Lars Oppermann Hamburg, Germany

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(Compile ghc 6.7) Cannot find package base
by Mads Lindstrøm 12 Aug '07

12 Aug '07

Hi all I tried compiling ghc 6.7 during the night. I used the following script: #!/bin/bash rm -rf $HOME/ghc darcs get --partial http://darcs.haskell.org/ghc cd ghc chmod +x darcs-all ./darcs-all get ./darcs-all --extra get sh boot ./configure --prefix=$HOME echo "Checkpoint make" make echo "Checkpoint make install" make install but when I run ghci I get: GHCi, version 6.7.20070810: http://www.haskell.org/ghc/ :? for help <interactive>:1:22: Failed to load interface for `System.IO': Use -v to see a list of the files searched for. <interactive>:1:22: Failed to load interface for `System.IO': Use -v to see a list of the files searched for. <interactive>:1:22: Failed to load interface for `System.IO': Use -v to see a list of the files searched for. ghc-6.7.20070810: panic! (the 'impossible' happened) (GHC version 6.7.20070810 for i386-unknown-linux): interactiveUI:setBuffering Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug Is this really a bug or am I doing something wrong? I also tried: ghc-pkg check and got: package ghc-6.7.20070810 has missing dependencies: hpc, template-haskell, readline, unix, Cabal, base, haskell98 If anybody is interested I got the complete build logs, but given there size 2.2 megabytes (180 kilo when compressed with gzip) I choose not to include them in the message. Greetings, Mads Lindstrøm

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Re: Visual Haskell will not Install with Visual Studio 2005, Express Edition
by Esa Ilari Vuokko 12 Aug '07

12 Aug '07

Hi, On 7/27/07, Sean Johnson <elquesogrande0(a)gmail.com> wrote: > Is there some way to install Visual Haskell with VS2005, Express? Perhaps > some workaround or hack? It's probably impossible. Feature matrix for Visual Studio products says "Use 3rd party controls and content. No Macros, Add-ins or Packages". [1] Best regards, Esa [1] http://msdn2.microsoft.com/en-us/vstudio/aa700921.aspx

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compiler-detected nontermination
by Isaac Dupree 10 Aug '07

10 Aug '07

Firstly I'm assuming that GHC's strictness analyser notices things like (bottom = bottom) or could easily do so - please correct me if I'm wrong. GHC in its RTS already throws Nontermination exception in some cases. I think it would be nice if, when the compiler detected nontermination, to replace it with an exception and emit a warning message (hmm... if GHC Core loses source code information, a warning message might be difficult). Is there any intentional use of certain nontermination? This is inspired by the problem that supplying default definitions for class methods that refer to each other (such as Eq's (==) and (/=)), doesn't warn you if you don't define them and only yields your program not to terminate, when you run it! (noticed on haskell-prime list.) Even if it can't be detected automatically, maybe a pragma for classes to tell the compiler what documentation often tells users: {-# MINIMAL_INSTANCE Eq (==) OR (/=) #-} or for Data.Bits.Bits "Minimal complete definition: .&., .|., xor, complement, (shift or (shiftL and shiftR)), (rotate or (rotateL and rotateR)), bitSize and isSigned. " {-# MINIMAL_INSTANCE Bits (.&.) AND (.|.) AND xor AND complement AND (shift OR (shiftL AND shiftR)) AND (rotate OR (rotateL AND rotateR)) AND bitSize AND isSigned #-} Except that Bits is a stupid class in which you're *supposed to* leave bitSize undefined for unlimited-precision types like Integer... GHC already warns if you don't define bitSize... Maybe "AND" --> "," , "OR" --> "|" or something Thoughts? Isaac

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