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May 2005

4 participants
2 discussions

WinHugs error
by Paqui Lucio 26 Feb '06

26 Feb '06

Hi, > I have installed Hugs98 Nov2003 on Windows XP. > WinHugs opens with the message: > > __ __ __ __ ____ ___ > _______________________________________________ > || || || || || || ||__ Hugs 98: Based on the Haskell 98 standard > ||___|| ||__|| ||__|| __|| Copyright (c) 1994-2003 > ||---|| ___|| World Wide Web: http://haskell.org/hugs > || || Report bugs to: hugs-bugs(a)haskell.org > || || Version: Nov 2003 > _______________________________________________ > > Hugs mode: Restart with command line option +98 for Haskell 98 mode > > ERROR ".\Prelude.hs" - Module "Hugs.Prelude" already loaded > Hugs.Prelude> > > > > Is that normal ? > > Thanks in advance, > Paqui > > --------------------------------- > Paqui Lucio > Dpto de LSI > Facultad de Informática > Paseo Manuel de Lardizabal, 1 > 20080-San Sebastián > SPAIN > --------------------------------- > Tfn: (+34) (9)43 015049 > Fax: (+34) (9)43 015590 > --------------------------------- >

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Re: [Haskell-cafe] Writing functions in Haskell.
by Daniel Fischer 05 May '05

05 May '05

Am Freitag, 29. April 2005 18:01 schrieb Ross Paterson: > On Thu, Apr 28, 2005 at 09:22:15PM -0400, Cale Gibbard wrote: > > The second problem arises from hugs not doing the same thing as ghci > > with respect to looking up qualified variable names (that is, those > > with the module name specified, in this case, the standard module > > Char). You can tell hugs to also load the Char module on top of > > whatever code you have loaded by using the command ":also Char", after > > which the prompt should look like > > Char> > > and you can try > > toUpper 'a' > > Might as well use :load -- in both case Char becomes the new current > module, making the old current module inaccessible. There is a difference, though. Compare Test> :l Char Char> :n my_map ERROR - No names selected and Test> :a Char Char> :n my_map Test.my_map (1 names listed) So with :a(lso) the old module remains in sight for :n(ames) - and for :i in qualified form. Unfortunately I haven't found a way to use them, Hugs (Nov. 2003) in general refuses qualified names, though with some rather weird behaviour: Prelude> :l Test Test> :a Char Char> Prelude.map toUpper "buh" "BUH" Char> Data.Char.toUpper 'u' 'U' Char> :i Test.my_map my_map :: (a -> b) -> [a] -> [b] Char> Data.Char.toUpper 'u' ERROR - Undefined qualified variable "Data.Char.toUpper" Char> Prelude.map toUpper "buh" ERROR - Undefined qualified variable "Prelude.map" How can it be that Hugs knows these qualified names before I ask about Test.my_map but not afterwards? Puzzled, Daniel

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