- Glasgow-haskell-users

problem submitting ghc bug in trac
by Conal Elliott 17 Jul '08

17 Jul '08

I logged onto the ghc trac, am trying to submit a ghc bug report, and I get "TICKET_CREATE privileges are required to perform this operation". How do I get TICKET_CREATE privileges? I do see "logged in as conal". - Conal

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Bug in type equality constraints?
by Conal Elliott 16 Jul '08

16 Jul '08

I'm converting some code from functionally dependencies to associated types, and I've run into a problem with equality constraints and subclasses. The classes: class AdditiveGroup v => VectorSpace v where type Scalar v :: * (*^) :: Scalar v -> v -> v class VectorSpace v => InnerSpace v where (<.>) :: v -> v -> Scalar v Products of vector spaces are vector spaces *if* over the same scalar field. Hence: instance ( VectorSpace u,VectorSpace v , Scalar u ~ Scalar v ) => VectorSpace (u,v) where type Scalar (u,v) = Scalar u s *^ (u,v) = (s*^u,s*^v) Similarly for inner product spaces: instance ( InnerSpace u,InnerSpace v, Scalar u ~ Scalar v , AdditiveGroup (Scalar v) ) => InnerSpace (u,v) where (u,v) <.> (u',v') = (u <.> u') ^+^ (v <.> v') But here's where ghc-6.9.20080622 balks: Data\VectorSpace.hs:106:0: Couldn't match expected type `Scalar v' against inferred type `Scalar u' When checking the super-classes of an instance declaration In the instance declaration for `InnerSpace (u, v)' Any ideas? - Conal

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Re: [Haskell-cafe] Mutually recursive modules and google protocol-buffers
by Chris Kuklewicz 16 Jul '08

16 Jul '08

Thanks Roberto! Roberto Zunino wrote: > Chris Kuklewicz wrote: >> There is no way to create a "A.hs-boot" file that has all of >> (1) Allows A.hs-boot to be compiled without compiling B.hs first >> (2) Allows B.hs (with a {-# SOURCE #-} pragma) to be compiled after >> A.hs-boot >> (3) Allows A.hs to compiled after A.hs-boot with a consistent interface > > I thought the following A.hs-boot would suffice: > > module A(A) where > data A > > There's no need to provide the data constructors for type A. Does this > violate any of the goals above? > > Regards, > Zun. I tried that experiment. The failure is complicated, and triggers be a ghc bug. Hmmm... the bug for > module A(A) where > data A > deriving Show using "ghc -c -XGeneralizedNewtypeDeriving A.hs-boot" is > A.hs-boot:2:0:ghc-6.8.3: panic! (the 'impossible' happened) > (GHC version 6.8.3 for powerpc-apple-darwin): > newTyConEtadRhs main:A.A{tc r5z} > > Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug Is this a known bug? But now I see that > module A(A(..)) where > import B(B) > data A = A B | End > deriving Show > does work. And avoids the bug! -- Chris

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ghc.exe: panic! (the 'impossible' happened)
by Peter Hercek 12 Jul '08

12 Jul '08

Hi, I was advised to report it here ... and maybe somebody who knows ghc better can reproduce it or knows what is the problem. I uninstalled all ghc, gtk, and gtk2hs packages then installed ghc 6.8.3 and then gtk2hs 0.9.13 on Windows XP 32bit. This should not be because of some stalled files from previous ghc as it was suggested to me. And I was told there is nothing strange in gtk2hs 0.9.13 to cause this. A version of gtk2hs 0.9.12.1 I compiled myself works with ghc 6.8.3. I did not try to compile 0.9.13. Any ideas? Peter. status:0 peter@dwarf [764] /c/tools/Gtk2Hs/demos/hello % ls Makefile World.hs status:0 peter@dwarf [765] /c/tools/Gtk2Hs/demos/hello % ghcii.sh World.hs GHCi, version 6.8.3: http://www.haskell.org/ghc/ :? for help Loading package base ... linking ... done. [1 of 1] Compiling Main ( World.hs, interpreted ) Ok, modules loaded: Main. *Main> main Loading package array-0.1.0.0 ... linking ... done. Loading package bytestring-0.9.0.1.1 ... linking ... done. Loading package mtl-1.1.0.1 ... linking ... done. Loading package glib-0.9.13 ... <interactive>: Unknown PEi386 section name `.reloc' (while processing: C:/tools/Gtk2Hs/HSglib.o) ghc.exe: panic! (the 'impossible' happened) (GHC version 6.8.3 for i386-unknown-mingw32): loadObj: failed Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug *Main> :quit Leaving GHCi. status:0 peter@dwarf [766] /c/tools/Gtk2Hs/demos/hello %

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cvs.haskell.org
by Christian Maeder 11 Jul '08

11 Jul '08

Hi, What happened to the haskell cvs server? I used to get the programatica sources from there. But cvs -d :pserver:anoncvs@cvs.haskell.org:/cvs co -P programatica times out. monk.galois.com (69.30.63.197) Cheers Christian

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Generalized phase control for GHC
by Max Bolingbroke 07 Jul '08

07 Jul '08

Hi, As some of you may know, I'm working on adding support for dynamically loaded plugins to GHC this summer. As part of this we need a way to specify ordering on the compiler phases installed, so e.g. you can say that a phase you install should run after strictness analysis does. This problem begs for a more modular and principled solution than just reusing the current system where we use the natural numbers to impose an ordering on INLINE/RULE activations. I have proposed a system at http://hackage.haskell.org/trac/ghc/wiki/Plugins/Phases that replaces this with one of named compiler phases not only for plugins but for all activation control in the compiler. The proposal mostly remains backwards compatible with the most common uses of the numeric format, with an exception noted on the page and below. I would be interested in feedback on the design before the implementation is complete and in the wild. I'm especially interested in hearing if you believe that loss of support for numeric phase numbers > 2 is a problem, as this is the only breaking change that I'm proposing. Cheers, Max

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using ghc-paths and rlwrap with GHCi - two additions to the GHCi HaskellWiki
by Claus Reinke 06 Jul '08

06 Jul '08

1. If you ever find yourself inside a GHCi session, wondering what packages are installed for this very GHCi, whereever those OpenGL modules were located in the module hierarchy, what package that module belongs to, or where the library docs are, well, anything that means you need to find the *matching ghc-pkg*, or the *matching users_guide* for your GHCi session, you can exploit Simon's new ghc-paths package (also for GHC API clients who need to find that libdir for their session): http://hackage.haskell.org/cgi-bin/hackage-scripts/package/ghc-paths This wiki entry suggests some command :defs, using ghc-paths to call the right ghc-pkg, or open the right users_guide from within a GHCi session: http://www.haskell.org/haskellwiki/GHC/GHCi#Package_and_documentation_looku… 2. If you're using GHCi on windows, you're probably missing out on its commandline completion support - rlwrap can get you at least some of that (might also be interesting for other Haskell apps that can't or won't use readline/editline for user input). This wiki entry shows basic usage, and how to extract lists of GHC options and package modules, for completion purposes: http://www.haskell.org/haskellwiki/GHC/GHCi#rlwrap_-_what_to_try_when_your_… Enjoy (and don't forget to add your own tips&tricks to that wiki page!-), Claus

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ghc-6.8.1 on solaris-sparc
by Johannes Waldmann 03 Jul '08

03 Jul '08

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hello. I am assuming that 6.8.1 is the latest binary release for solaris-sparc? When I try to call ghc, it says ld.so.1: ghc-6.8.1: fatal: relocation error: file /usr/local/lib/libncurses.so.5: symbol main: referenced symbol not found my machine is: sparc-sun-solaris2.10 I think I have all the necessary packages: ldd /home/waldmann/built/lib/ghc-6.8.1/ghc-6.8.1 librt.so.1 => /lib/librt.so.1 libreadline.so.5 => /usr/local/lib/libreadline.so.5 libncurses.so.5 => /usr/local/lib/libncurses.so.5 libdl.so.1 => /lib/libdl.so.1 libm.so.2 => /lib/libm.so.2 libgmp.so.3 => /home/waldmann/built/lib/libgmp.so.3 libpthread.so.1 => /lib/libpthread.so.1 libc.so.1 => /lib/libc.so.1 libaio.so.1 => /lib/libaio.so.1 libmd.so.1 => /lib/libmd.so.1 libgcc_s.so.1 => /usr/local/lib/libgcc_s.so.1 /platform/SUNW,Sun-Fire-V445/lib/libc_psr.so.1 /platform/SUNW,Sun-Fire-V445/lib/libmd_psr.so.1 but this looks strange: nm /usr/local/lib/libncurses.so.5|grep main [1192] | 0| 0|NOTY |GLOB |0 |UNDEF |main Any hints appreciated - J.W. -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.4-svn0 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFIbJUjDqiTJ5Q4dm8RAqWvAKCAwkVKJgLnLL3Uz0rr3Yp3AzVQmACfVyEe n3LqWHh2zvaeGopm4t7xpSc= =nryk -----END PGP SIGNATURE-----

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Takusen build error
by Benjamin Franksen 02 Jul '08

02 Jul '08

I get a strange error building Takusen (more precisely: the module Foreign/C/UTF8.hs) with ghc-6.8.3. It says aragon: .../ghc-6.8.3/Takusen-0.8.1 > ./Setup build -v Reading parameters from /srv/projects/ctl/franksen/haskell/ghc-6.8.3/Takusen-0.8.1/takusen.buildinfo Creating dist/build (and its parents) Creating dist/build/autogen (and its parents) Preprocessing library Takusen-0.8.1... Building Takusen-0.8.1... Building library... Creating dist/build (and its parents) Creating dist/build (and its parents) /projects/ctl/franksen/usr/bin/ghc -package-name Takusen-0.8.1 --make -hide-all-packages -i -idist/build/autogen -idist/build -i. -Idist/build -I/opt/oracle/product/client/rdbms/demo -odir dist/build -hidir dist/build -stubdir dist/build -package base-3.0.2.0 -package mtl-1.1.0.1 -package time-1.1.2.1 -package old-time-1.0.0.0 -O -XCPP Database.Enumerator Database.Util Database.Oracle.Enumerator Database.Oracle.OCIConstants Database.Oracle.OCIFunctions Database.Stub.Enumerator Control.Exception.MonadIO Foreign.C.UTF8 Database.InternalEnumerator [1 of 9] Compiling Foreign.C.UTF8 ( Foreign/C/UTF8.hs, dist/build/Foreign/C/UTF8.o ) /tmp/ghc18936_0/ghc18936_0.s: Assembler messages: /tmp/ghc18936_0/ghc18936_0.s:1257:0: Error: symbol `base_GHCziBase_Z0T_closure' is already defined I compiled ghc-6.8.3 from source, using ghc-6.8.2 to bootstrap. Any ideas? Cheers Ben

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ANNOUNCE: GHC version 6.8.3
by Ian Lynagh 02 Jul '08

02 Jul '08

============================================================= The (Interactive) Glasgow Haskell Compiler -- version 6.8.3 ============================================================= The GHC Team is pleased to announce a new patchlevel release of GHC. This release contains a number of bugfixes relative to 6.8.2, so we recommend upgrading. Release notes are here: http://haskell.org/ghc/docs/6.8.3/html/users_guide/release-6-8-3.html How to get it ~~~~~~~~~~~~~ The easy way is to go to the web page, which should be self-explanatory: http://www.haskell.org/ghc/ We supply binary builds in the native package format for many platforms, and the source distribution is available from the same place. Packages will appear as they are built - if the package for your system isn't available yet, please try again later. Background ~~~~~~~~~~ Haskell is a standard lazy functional programming language; the current language version is Haskell 98, agreed in December 1998 and revised December 2002. GHC is a state-of-the-art programming suite for Haskell. Included is an optimising compiler generating good code for a variety of platforms, together with an interactive system for convenient, quick development. The distribution includes space and time profiling facilities, a large collection of libraries, and support for various language extensions, including concurrency, exceptions, and foreign language interfaces (C, whatever). GHC is distributed under a BSD-style open source license. A wide variety of Haskell related resources (tutorials, libraries, specifications, documentation, compilers, interpreters, references, contact information, links to research groups) are available from the Haskell home page (see below). On-line GHC-related resources ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Relevant URLs on the World-Wide Web: GHC home page http://www.haskell.org/ghc/ GHC developers' home page http://hackage.haskell.org/trac/ghc/ Haskell home page http://www.haskell.org/ Supported Platforms ~~~~~~~~~~~~~~~~~~~ The list of platforms we support, and the people responsible for them, is here: http://hackage.haskell.org/trac/ghc/wiki/Contributors Ports to other platforms are possible with varying degrees of difficulty. The Building Guide describes how to go about porting to a new platform: http://hackage.haskell.org/trac/ghc/wiki/Building Developers ~~~~~~~~~~ We welcome new contributors. Instructions on accessing our source code repository, and getting started with hacking on GHC, are available from the GHC's developer's site run by Trac: http://hackage.haskell.org/trac/ghc/ Mailing lists ~~~~~~~~~~~~~ We run mailing lists for GHC users and bug reports; to subscribe, use the web interfaces at http://www.haskell.org/mailman/listinfo/glasgow-haskell-users http://www.haskell.org/mailman/listinfo/glasgow-haskell-bugs There are several other haskell and ghc-related mailing lists on www.haskell.org; for the full list, see http://www.haskell.org/mailman/listinfo/ Some GHC developers hang out on #haskell on IRC, too: http://www.haskell.org/haskellwiki/IRC_channel Please report bugs using our bug tracking system. Instructions on reporting bugs can be found here: http://www.haskell.org/ghc/reportabug

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