September 2003 - Glasgow-haskell-users

hey
by handily 16 Sep '03

16 Sep '03

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Raylı Dolap Sistemleri
by raydoor 16 Sep '03

16 Sep '03

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RE: Query regarding GHC handling of overlapping instances.
by Simon Peyton-Jones 16 Sep '03

16 Sep '03

| If I change the definition to: | | instance Test (a -> m b) z where | test _ _ = "Third" | | it now complains about it overlapping with both of the other | definitions... Why does this overlap? Here are your instance decls instance Test (a b) (c b) where test x y = "First" instance Test (a b) (a b) where test x y = "Second" instance Test (a -> m b) z where test _ _ = "Third" Two instances *overlap* if there is a constraint (Test t1 t2) that is a) (Test t1 t2) is an instance of more than one instance decl b) None of these instance decls is more specific than all the others Under these circumstances, we can't pick one over the other. For example, Test (Int -> [Bool]) [Bool] matches the first instance decl a = (->) Int, b = Bool, c = [] and the third a = Int, m = [], b = Bool, z = [Bool] But it is not the case that the first instance decl is more specific than the third, or vice versa. (An instance decl I1 is more specific than I2 if any constraint matching I1 also matches I2). | If I add the following definition to the test code: | | instance Test (a -> m b) (m b) where | test _ _ = "Third" | | then I add the following print: | | print $ test (\_ -> [True]) [True] | | it says no instance for (t -> [Bool), but if I add a type annotation all | is Okay: | | print $ test ((\_ -> [True]) :: () -> [Bool]) [True] | | Is this expected behavior? NO: it's a bug in GHC, which I have just put into SourceForge. http://sourceforge.net/tracker/index.php?func=detail&aid=807249&group_id =8032&atid=108032 It's rather an obscure case, but definitely wrong. Thanks for showing it up. Simon

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Re: Fw: cannot find -lreadline
by Malcolm Wallace 16 Sep '03

16 Sep '03

"Luc Taesch" <luc.taesch(a)skynet.be> writes: > > when compiling HaXML with 6.01 on mandrake, I got > > /usr/bin/ld: cannot find -lreadline, as detailled hereafter. The HaXml package does not require or use readline. So I think this problem is a ghc-6.0.1 problem, not specific to HaXml. Regards, Malcolm

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I NEED YOUR URGENT ASSISTANCE
by victor michelle 15 Sep '03

15 Sep '03

ATTN: Natasa , I am BARRISTER VICTOR MICHELLE (ESQ)A Solicitor. I am the Personal Attorney to Mr. JAMES Natasa a national of your country,who used to work with Chevron company in Nigeria.On the 21st of April 2000, my client, his wife And their three children were involved in a car accident along Sagbama Express Road. All occupants of the vehicle unfortunately lost there lives. Since then I have made several enquiries to your embassy to locate any of my clients extended relatives, this has also proved unsuccessful.After these several unsuccessful attempts, I decided to trace his relatives over the Internet, to locate any member of his family but of no avail, hence I contacted you. I have contacted you to assist in repartrating the money and property left behind by my client before they get confisicated or declared unserviceable by the National Bank PLC where this huge deposits were lodged. Particularly,the National Bank PLC where the deceased had a valued at about 9 million dollars has issued me a notice to provide the next of kin or have the account confisicated . since I have been unsuccesfull in locating the the relatives for over 2 years now I seek your conscent to present you as the next of kin of the deceased since you are from the same country so that the proceeds of this account valued at $9 million dollars can be paid to you and then you and me can share the money. 55% to me and 40% to you,while 5% has been earmarked to reimburse all expenses that may occure during this transaction All I require is your honest cooperation to enable us see this dealt. I guarantee that this will be executed under a legitimate arrangement that will protect you from any breach of the law.Please send me your full name and address, your telephone and fax number to enable us discuss further and file in an application of claim on your behalf to the National Bank PLC. Best Regards, BARRISTER VICTOR MICHELLE (ESQ)

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I NEED YOUR URGENT ASSISTANCE
by victor michelle 15 Sep '03

15 Sep '03

ATTN: HANS, I am BARRISTER VICTOR MICHELLE (ESQ)A Solicitor. I am the Personal Attorney to Mr. JAMES HANS a national of your country,who used to work with Chevron company in Nigeria.On the 21st of April 2000, my client, his wife And their three children were involved in a car accident along Sagbama Express Road. All occupants of the vehicle unfortunately lost there lives. Since then I have made several enquiries to your embassy to locate any of my clients extended relatives, this has also proved unsuccessful.After these several unsuccessful attempts, I decided to trace his relatives over the Internet, to locate any member of his family but of no avail, hence I contacted you. I have contacted you to assist in repartrating the money and property left behind by my client before they get confisicated or declared unserviceable by the National Bank PLC where this huge deposits were lodged. Particularly,the National Bank PLC where the deceased had a valued at about 9 million dollars has issued me a notice to provide the next of kin or have the account confisicated . since I have been unsuccesfull in locating the the relatives for over 2 years now I seek your conscent to present you as the next of kin of the deceased since you are from the same country so that the proceeds of this account valued at $9 million dollars can be paid to you and then you and me can share the money. 55% to me and 40% to you,while 5% has been earmarked to reimburse all expenses that may occure during this transaction All I require is your honest cooperation to enable us see this dealt. I guarantee that this will be executed under a legitimate arrangement that will protect you from any breach of the law.Please send me your full name and address, your telephone and fax number to enable us discuss further and file in an application of claim on your behalf to the National Bank PLC. Best Regards, BARRISTER VICTOR MICHELLE (ESQ)

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Heap profiling - breakdown by type
by Kirsten Chevalier 15 Sep '03

15 Sep '03

Currently, the -hy RTS option for heap profiling by type doesn't print a summary of the amount allocated for each type, only the amount of data that was live at a given instant. How hard would it be to change it to print out total amounts allocated over the entire run of the program for each type as well? I'd be willing to try to implement it, but any hints would be appreciated (and I wouldn't be sad if someone else went ahead and did it :-) Thanks, Kirsten -- Kirsten Chevalier * krc(a)uclink.berkeley.edu * Often in error, never in doubt

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RE: stg_ap_v_ret porting crash: solved?
by Simon Marlow 15 Sep '03

15 Sep '03

> > What are the binary sizes like? > > magdcalc is > > 2730251 (reg) > 7697141 (unreg) > > before stripping and > > 1375696 (reg) > 4771196 (unreg) > > after. A lot of that difference is due to the absence of SplitObjs on the unregisterised build, so don't worry too much. Cheers, Simon

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15 Sep '03

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RE: stg_ap_v_ret porting crash: solved?
by Simon Marlow 15 Sep '03

15 Sep '03

> # I ^C it after a little while: > > Program received signal SIGINT, Interrupt. > 0x1212c62b0 in StgRun () at StgCRun.c:6 > 6 * STG-to-C glue. > > > So it stalls or loops (it sits at 98% of cpu) on entry to stg_init(). > > More info will have to wait until I try a debug build. Try with a debugging RTS, and use 'stepi' rather than 'step' when in Haskell code (everything from StgRun onwards), because the debugger won't have any line number info. Cheers, Simon

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