Re: [Haskell-cafe] The values of infinite lists
Deokhwan Kim wrote: Are the values of infinite lists _|_ (bottom)? Depends on what you mean by "value". If you define "value" to mean "normal form", then yes. If you define "value" to mean "weak head normal form", then no. The former is common in strict programming languages. In nonstrict functional programming, the latter is more useful. ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] The values of infinite lists
Are the values of infinite lists _|_ (bottom)? In section 1.3, the Haskell 98 report said as follows: Errors in Haskell are semantically equivalent to _|_. Technically, they are not distinguishable from nontermination, so the language includes no mechanism for detecting or acting upon errors. Therefore, the value of the following infinity is _|_. Right? data Nat = Zero | Succ Nat infinity = Succ infinity What about infinite lists? For example, is the value of [1 ..] also _|_? Thanks. ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] develop new Haskell shell?
Did you see [http://nellardo.com/lang/haskell/hash/] ? Google also finds some links to code. #g -- Marc Weber wrote: > Hi. > > Who wants to try devloping a new shell with me? > > The main goals: try adding some haskell scriting instead of bash/zsh, > > history dependend on > a) executing program > b) current dir > c) last commands > d) workspaces > which should mean that the shell should save at least the last 10 > commands of a,b,c,d. > > So you can do > emerge (lookup parameters in history) even if you haven't used emerge > for ages.. :) Nice, isn't it? > > d) Workspaces should mean: > You can define some kind of workspace like > workspace=haskellproject, wash, apache > to add these tags together with the commands to the history.. > So when working only in the "wash" workspace you can easily find those > commands.. Perhpas it's even useful to attach commands or even scripts > to those workspaces? > > eg the startApache script may be attached to > admin, apache, ..., > the cd /etc/init.d command only to admin.. > > I also would like to have some advanced kind of directory matching, > defining aliases for directories. > > eg just type > cd /usl to get a list of diretories looking like this: > /UserShupportLocales > /usr/src/linux > /usl ? > > Using tab and bash is nice but it might be done better? > > Any suggestions? > > One would have to think about how to run processes in background and so > on ... > > adding files as parameters the way it's possible in mc ( select them and > add them to the command line ) > > perhaps even implement cp/mv/ ... for virtual file systems like zip > files/ ftp/ ... ? > > and last but not least: > on windows add all Programs beeing found in Start-> Programs to the path > list... I wish I could just do word/ Enterprise Manager at a shell and > not searching for the menu entries over and over again.. ;) > I know I can add them the to the path.. but that would be some work, > too.. and not desirable in any case. > > I could imagine adding a small prefix to each cmd eg. > > eb (execute bash cmd) > ez (execute zsh cmd) > r (remove file list) > efs (execute from windows start menu) > bg run in background like bashs & feature. > > Perhaps even introduce some new syntax ? > or use ghci or hugs with a preprocessor to translate these commands to > haskell commands? > > What do you think? > > Marc Weber > ___ > Haskell-Cafe mailing list > Haskell-Cafe@haskell.org > http://www.haskell.org/mailman/listinfo/haskell-cafe > -- Graham Klyne For email: http://www.ninebynine.org/#Contact ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] develop new Haskell shell?
Hi. Who wants to try devloping a new shell with me? The main goals: try adding some haskell scriting instead of bash/zsh, history dependend on a) executing program b) current dir c) last commands d) workspaces which should mean that the shell should save at least the last 10 commands of a,b,c,d. So you can do emerge (lookup parameters in history) even if you haven't used emerge for ages.. :) Nice, isn't it? d) Workspaces should mean: You can define some kind of workspace like workspace=haskellproject, wash, apache to add these tags together with the commands to the history.. So when working only in the "wash" workspace you can easily find those commands.. Perhpas it's even useful to attach commands or even scripts to those workspaces? eg the startApache script may be attached to admin, apache, ..., the cd /etc/init.d command only to admin.. I also would like to have some advanced kind of directory matching, defining aliases for directories. eg just type cd /usl to get a list of diretories looking like this: /UserShupportLocales /usr/src/linux /usl ? Using tab and bash is nice but it might be done better? Any suggestions? One would have to think about how to run processes in background and so on ... adding files as parameters the way it's possible in mc ( select them and add them to the command line ) perhaps even implement cp/mv/ ... for virtual file systems like zip files/ ftp/ ... ? and last but not least: on windows add all Programs beeing found in Start-> Programs to the path list... I wish I could just do word/ Enterprise Manager at a shell and not searching for the menu entries over and over again.. ;) I know I can add them the to the path.. but that would be some work, too.. and not desirable in any case. I could imagine adding a small prefix to each cmd eg. eb (execute bash cmd) ez (execute zsh cmd) r (remove file list) efs (execute from windows start menu) bg run in background like bashs & feature. Perhaps even introduce some new syntax ? or use ghci or hugs with a preprocessor to translate these commands to haskell commands? What do you think? Marc Weber ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] Re: GHC 6.4.1 x86-64 does not compile
Well, thanks for kicking. :-) Now, I have a 6.4.1 version compiling for 64bits. Nevertheless, if I try to build a 6.4.2 based on this ghc and 64bit gcc, I get this error during make (quite soon after make starts) - below my text. Is there again a problem in mixing of 32/64-bit versions or is there a principial problem? Any further kick is velcome :-) Thx and regards Dusan P.S. Curently produced executable by ghhc 6.4.1 has the following signature: a.out: ELF 64-bit LSB executable, AMD x86-64, version 1 (SYSV), for GNU/Linux 2.4.0, dynamically linked (uses shared libs), stripped D. -- /mnt/data/FLP/bin/ghc -H16m -O -cpp -Wall -fno-warn-name-shadowing -fno-warn-unused-matches -i../../lib/compat -ignore-package Cabal -Rghc-timing-c Version.hs -o Version.o -ohi Version.hi Version.hs:2:0: Warning: Definition but no type signature for `version' Version.hs:3:0: Warning: Definition but no type signature for `targetOS' Version.hs:4:0: Warning: Definition but no type signature for `targetARCH' In file included from /tmp/ghc24730.hc:4: /mnt/data/FLP/lib/ghc-6.4.1/include/HsBase.h:42:21: termios.h: not a file or directory /mnt/data/FLP/lib/ghc-6.4.1/include/HsBase.h:81:23: sys/timeb.h: not a file or directory In file included from /tmp/ghc24730.hc:4: /mnt/data/FLP/lib/ghc-6.4.1/include/HsBase.h:538: error: syntax error before "__hscore_lflag" /mnt/data/FLP/lib/ghc-6.4.1/include/HsBase.h:538: warning: "struct termios" declared inside parameter list /mnt/data/FLP/lib/ghc-6.4.1/include/HsBase.h:538: warning: its scope is only this definition or declaration, which is probably not what you want /mnt/data/FLP/lib/ghc-6.4.1/include/HsBase.h:538: warning: return type defaults to `int' /mnt/data/FLP/lib/ghc-6.4.1/include/HsBase.h: In function `__hscore_lflag': /mnt/data/FLP/lib/ghc-6.4.1/include/HsBase.h:538: error: dereferencing pointer to incomplete type /mnt/data/FLP/lib/ghc-6.4.1/include/HsBase.h: At top level: /mnt/data/FLP/lib/ghc-6.4.1/include/HsBase.h:541: error: syntax error before "tcflag_t" /mnt/data/FLP/lib/ghc-6.4.1/include/HsBase.h: In function `__hscore_poke_lflag': /mnt/data/FLP/lib/ghc-6.4.1/include/HsBase.h:541: error: `ts' undeclared (first use in this function) /mnt/data/FLP/lib/ghc-6.4.1/include/HsBase.h:541: error: (Each undeclared identifier is reported only once /mnt/data/FLP/lib/ghc-6.4.1/include/HsBase.h:541: error: for each function it appears in.) /mnt/data/FLP/lib/ghc-6.4.1/include/HsBase.h:541: error: `t' undeclared (first use in this function) /mnt/data/FLP/lib/ghc-6.4.1/include/HsBase.h: At top level: /mnt/data/FLP/lib/ghc-6.4.1/include/HsBase.h:544: warning: "struct termios" declared inside parameter list /mnt/data/FLP/lib/ghc-6.4.1/include/HsBase.h: In function `__hscore_ptr_c_cc': /mnt/data/FLP/lib/ghc-6.4.1/include/HsBase.h:545: error: dereferencing pointer to incomplete type /mnt/data/FLP/lib/ghc-6.4.1/include/HsBase.h: In function `__hscore_sizeof_termios': /mnt/data/FLP/lib/ghc-6.4.1/include/HsBase.h:551: error: invalid application of `sizeof' to incomplete type `termios' <(3 samples), 20M in use, 0.00 INIT (0.00 elapsed), 0.18 MUT (0.45 elapsed), 0.18 GC (0.17 elapsed) :ghc>> make[4]: *** [Version.o] Error 1 make[3]: *** [boot] Error 2 make[2]: *** [boot] Error 1 make[1]: *** [boot] Error 1 make[1]: Leaving directory `/mnt/data/FLP/Downloads/ghc-6.4.2/ghc' make: *** [build] Error 1 Simon Marlow wrote: Dusan Kolar wrote: Hello all, I've install "universal binary" for x86_64 of GHC 6.4.1. The installation was done on AMD dual core machine. Uname for the machine gives: Linux 2.6.16.5 #1 SMP Thu Apr 13 09:08:22 CEST 2006 x86_64 x86_64 x86_64 GNU/Linux While ghci was running some tests well, the ghc ended compilation with a long list of errors starting like this: Chasing modules from: queen-main Compiling QueensDK ( ./QueensDK.hs, ./QueensDK.o ) /tmp/ghc27286.s: Assembler messages: /tmp/ghc27286.s:26: Error: bad register name `%r12' /tmp/ghc27286.s:27: Error: bad register name `%r15' /tmp/ghc27286.s:29: Error: bad register name `%r12)' /tmp/ghc27286.s:30: Error: bad register name `%r12)' /tmp/ghc27286.s:31: Error: bad register name `%r12)' /tmp/ghc27286.s:32: Error: bad register name `%rax' /tmp/ghc27286.s:33: Error: bad register name `%r13)' /tmp/ghc27286.s:34: Error: bad register name `%rbp' /tmp/ghc27286.s:37: Error: bad register name `%rbx)' /tmp/ghc27286.s:38: Error: bad register name `%rbx)' /tmp/ghc27286.s:45: Error: bad register name `%rbp)' /tmp/ghc27286.s:46: Error: bad register name `%r14' /tmp/ghc27286.s:48: Error: bad register name `%rbp)' /tmp/ghc27286.s:49: Error: bad register name `%r13' The list is quite long. I've truncated it. Well, OK, the x386 version is running, but it won't compile GHC-6.4.2 and, moreover, it's not optimized for the HW. ;-) Is there any way out, or what may I be doing wrong way? It appears that somehow the assembler is being used in 32-bit mode, rather than 6
