- Hugs-Bugs - Haskell.org

patch for `interact'
by Malcolm Wallace 20 Dec '01

20 Dec '01

There is a bug in Dec2001 Hugs (and earlier releases too) which causes the Prelude function `interact' to behave unexpectedly - the user's input is not echoed to the screen as she types it. A patch is attached which solves the problem. Regards, Malcolm --- src/iomonad.c Tue Dec 11 00:54:51 2001 +++ src/iomonad.c.patched Tue Dec 18 10:53:47 2001 @@ -844,6 +844,7 @@ HandleArg(h,1); if (handles[h].hmode&HSEMICLOSED) { /* read requires semi-closed handle*/ Int c = (h==HSTDIN ? readTerminalChar() : getc(handles[h].hfp)); + if (h==HSTDIN) putchar(c); if (c!=EOF && c>=0 && c<NUM_CHARS) { updapRoot(consChar(c),ap(nameHreader,primArg(1))); return;

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invalid comparsion in 'src/input.c' line 516
by michael becker 19 Dec '01

19 Dec '01

hi, i compiled 'Hugs Version: December 2001' on aix using the native aix-compiler. when i start hugs, hugs hangs when parsing Prelude.hs. this happens because on line 516 in 'src/input.c' an integer (EOF) is compared with a char 512 static Int local nextLine() 513 { 514 for (lineLength = 0; lineLength < LINEBUFFER_SIZE-1; lineLength++) { 515 lineBuffer[lineLength] = fgetc(inputStream); 516 if (lineBuffer[lineLength] == EOF) when i changed this to 512 static Int local nextLine() 513 { 514 int chr; 515 for (lineLength = 0; lineLength < LINEBUFFER_SIZE-1; lineLength++) { 516 lineBuffer[lineLength] = (chr = fgetc(inputStream)); 517 if (chr == EOF) hugs works ok. M.Becker

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installer Package for windows version of hugs98-Dec2001
by Ammon Sol 19 Dec '01

19 Dec '01

Hi, I want to install a hugs98 version for Windows. I have only found an "hugs98-Dec2001.msi" file for download, but I do not now, how to extract an Installer Package (.msi) with Windows98. I only know .msi files for Windows2000, which i do not have installed. Could you send me a link to a Windows98-version or explain me how to install the .msi into my system? thanks an sorry for my poor english Ammon Sol

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Test releases available
by Sigbjorn Finne 19 Dec '01

19 Dec '01

Hi, in preparation for a new release, a pair of release candidate Win32 installers are now available (*): http://www.galois.com/~sof/hugs98-Dec2001.msi contains the Dec 2001 release of Hugs98 and http://www.galois.com/~sof/GraphicsLib.msi which contains version 2.0.4 of Alastair Reid's Haskell Graphics library. This version works with the Dec 2001 release of Hugs and Paul Hudak's SOE sources, http://haskell.org/soe/ ... ..at least that's the claim! I'd appreciate it if people could give these installers a spin & report back to me asap any problems/glitches they may run into. thanks! --sigbjorn * - the installers rely on theWindows Installer runtime to operate. Should you not have it installed on your machine already, redistributables of the runtime can be downloaded from: http://www.microsoft.com/downloads/release.asp?releaseid=32831 (Windows 95,98 and ME) http://www.microsoft.com/downloads/release.asp?releaseid=32832 (Windows NT and 2000)

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hugs accepts derivings for classes when it can't provide the definition
by Ian Lynagh 17 Dec '01

17 Dec '01

hugs accepts data D a = D a deriving (Show) despite not being able to derive the instance. This goes against There is a context cx' such that cx' =>C tij holds for each of the constituent types tij." in appendix D of the report. Ian

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Bug in file-name imports?
by John Hughes 16 Dec '01

16 Dec '01

The way a filename is interpreted in an import, such as import "src/M" has changed under the December 2001 version of hugs. Previously, the filename was interpreted relative to the location of the importing module. That seems no longer to be the case (although I'm not sure where hugs does look nowadays). As a result, it's now impossible to load Fran, which places a few "public" modules in the directory you add to your path, and then loads many more from the src subdirectory. The idea is to avoid cluttering the module name space with all the internal modules. Is this a deliberate change? I didn't find any information on it in the notes on the new release, so I assume it's a bug.

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Left sections parse problem
by Ian Lynagh 16 Dec '01

16 Dec '01

[I reported this a while back but it doesn't seem to be fixed in the December release] Prelude> (3 * 4 +) 5 ERROR - Syntax error in expression (unexpected `)') Thanks Ian

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Parse errors
by Ian Lynagh 16 Dec '01

16 Dec '01

It looks like hugs has a problem with empty topdecls (allowable via topdecl -> decl -> gendecl) - with both of these modules: type T = String; data D = D module Foo where { type T = String;; data D = D } I get ERROR "q.lhs":3 - Syntax error in definition (unexpected `;', possibly due to bad layout) Thanks Ian

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ANNOUNCE: Hugs98 Christmas release
by Johan Nordlander 15 Dec '01

15 Dec '01

------------------------------------------------------------------------------ __ __ __ __ ____ ___ _________________________________________ || || || || || || ||__ Hugs 98: Based on the Haskell 98 standard ||___|| ||__|| ||__|| __|| Copyright (c) 1994-2001 ||---|| ___|| World Wide Web: http://haskell.org/hugs || || Report bugs to: hugs-bugs(a)haskell.org || || Version: Dec 2001 _________________________________________ ------------------------------------------------------------------------------ We are pleased to announce a new release of Hugs98, a Haskell interpreter and programming environment for developing cool Haskell programs. Sources and binaries are freely available on the World-Wide Web. The most important features of this new release are: - The incompatibilities between Hugs and the Haskell Graphics Library have been fixed, and binaries for the HGL are now available on the Hugs download page. - The missing standard libraries Directory, CPUTime, Time and Locale have been added along with a complete implementation of Haskell98 IO. - Hugs is now delivered with most of the hslibs libraries installed in the lib/exts/ directory. The added modules cover the Edison, Parsec, HaXml, QuickCheck, concurrent, monad, and html subdirectories of hslibs. - The :set option now refuses the user to set a module search path that doesn't contain the Prelude. This is to protect users from accidentally rendering their Hugs setups unusable, esp. so on Windows machines where the options are persisted to the Registry. - MacOS X is now one of the supported unix ports, with pre-built binaries available on the download page. - Experimental support is provided for hierarchical module names, where a module name A.B.C is mapped onto the file path A/B/C{.hs,.lhs} and appended to each of the path prefixes in HUGSPATH until the name of a readable file is found. Most reported bugs have also been fixed; however, some issues still remain. See the heading "Hugs Bugs & Features" on the Hugs web site for further information. Send email to hugs-users-request(a)haskell.org to join the hugs-users mailing list. Bug reports should be sent to hugs-bugs(a)haskell.org. Send email to hugs-bugs-request(a)haskell.org to subscribe to the hugs-bugs list. The home page for Hugs is at http://www.haskell.org/hugs. ------------------------------------------------------------------------------ The Hugs 98 system is Copyright (c) Mark P Jones, Alastair Reid, the Yale Haskell Group, and the Oregon Graduate Institute of Science and Technology, 1994-2001, All rights reserved. It is distributed as free software under the license in the file "License", which is included in the distribution. ------------------------------------------------------------------------------

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hugs gets confused when 2 modules are imported with the same name
by Ian Lynagh 15 Dec '01

15 Dec '01

With this module: module Q (foo) where import List as Foo import Maybe as Foo foo = Foo.find hugs says ERROR tt.lhs:7 - Undefined qualified variable "Foo.find" "5.3.3 Local aliases" in the report makes it clear that this should be allowed. Thanks Ian

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