September 2009 - Glasgow-haskell-users

no backspace, delete or arrow keys in ghci
by Gabriel Schwanen 08 Sep '09

08 Sep '09

Hello to everybody, I'm currently working with Haskell via the ghc interpreter (version 6.10.4 on Ubuntu 9.10). The problem, if it is really a problem and not a normal comportement, happens when I try, as example, to enter some characters after having execute getLine. Actually, if I make a mistake when typing the string, I can't use neither backspace, delete or even arrow keys to correct it before hitting enter to finish input. In fact, as example, if I hit backspace, I get "^?" in place of deleting the previous character ... :^( As I wrote above, I don't know if it is a "bug" or not. Maybe it is normal. Can someone help me ? Thanks in advance, Gabriel

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ghc --help displays obsolete URL
by Ahn, Ki Yung 08 Sep '09

08 Sep '09

$ ghc --help ... The User's Guide has more information about GHC's *many* options. An online copy can be found here: http://www.haskell.org/ghc/documentation.html ------------------------------------------------------------------------ The above URL does not exist! Hope it gets fixed in 6.12.x

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few questions about GHC RTS
by Peter Hercek 07 Sep '09

07 Sep '09

Hi, I thought I may look at the :next command for GHCi debugger again. If I do, I will not make it before 6.12.1 is out. I have few questions about RTS in relation to :next implementation. If they is easy to answer I would appreciate it, if not, don't bother since I'm not sure I'll do it ... and If I decide to do it I may just figure it out myself or fail again :) Why is stg_nofoceIO_info added as last argument to IO actions in unregistered mode? Do I still need to pass it in even when (I think) my IO action does not need it? E.g. is it required for every IO action by some stack walking code or something? Are there any Cmm functions in RTS with signature (IO()) or signature (Int->IO()) which I could check out as examples to see how they are done? ... and ideally also how they are called from the stack. Are there any special things to do when adding a new field (e.g. simulated stack size) to StgTSO? Thanks, Peter.

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