[Haskell-cafe] cabal: internal error when reading package index

2013-09-18 Thread Henk-Jan van Tuyl
L.S., I was trying to install a package from a local drive and got the following message: cabal install Resolving dependencies... cabal: internal error when reading package index: could not read tar file entryThe package index or index cache is probably corrupt. Running cabal

Re: [Haskell-cafe] cabal: internal error when reading package index

2013-09-18 Thread Ivan Lazar Miljenovic
On 18 September 2013 19:23, Henk-Jan van Tuyl hjgt...@chello.nl wrote: L.S., I was trying to install a package from a local drive and got the following message: cabal install Resolving dependencies... cabal: internal error when reading package index: could not read tar file

[Haskell-cafe] Multi-param typeclass vs locally constrained typeclass methods

2013-09-18 Thread Jacques Carette
Could someone please explain what the difference (if any!), in semantics is between class Foo f = Bar f g where method1 :: f a - g a and class Bar' g where method2 :: Foo f = f a - g a ? Maybe the translation of the above to something lower level might help. [Note: f a - g a is just

Re: [Haskell-cafe] Multi-param typeclass vs locally constrained typeclass methods

2013-09-18 Thread Roman Cheplyaka
* Jacques Carette care...@mcmaster.ca [2013-09-18 08:21:51-0400] Could someone please explain what the difference (if any!), in semantics is between class Foo f = Bar f g where method1 :: f a - g a and class Bar' g where method2 :: Foo f = f a - g a Bar is more flexible than

[Haskell-cafe] future (editor) of HCAR?

2013-09-18 Thread Janis Voigtlaender
Dear all, The Haskell Communities and Activities Report has been produced twice a year for more than ten years now: http://www.haskell.org/haskellwiki/Haskell_Communities_and_Activities_Report I have been responsible for producing it the last few years, which was fun. I am now looking to pass

Re: [Haskell-cafe] future (editor) of HCAR?

2013-09-18 Thread Alejandro Serrano Mena
I would be delighted to take the full responsibility (or just help) in the HCAR. I have some ideas, maybe I could get some time later to write them down. 2013/9/18 Janis Voigtlaender j...@informatik.uni-bonn.de Dear all, The Haskell Communities and Activities Report has been produced twice a

Re: [Haskell-cafe] Multi-param typeclass vs locally constrained typeclass methods

2013-09-18 Thread Jacques Carette
On 13-09-18 08:54 AM, Roman Cheplyaka wrote: * Jacques Carette care...@mcmaster.ca [2013-09-18 08:21:51-0400] Could someone please explain what the difference (if any!), in semantics is between class Foo f = Bar f g where method1 :: f a - g a and class Bar' g where method2 :: Foo f = f

Re: [Haskell-cafe] OS X ghci problem

2013-09-18 Thread Carter Schonwald
The ghci bug goes away when you use a ghc head snapshot from late summer? Great! On Wednesday, September 18, 2013, Jan-Philip Loos wrote: Sadly I was not able to use your build directly, because ghc(i) searched libs in a invalid path (it seems to be wired to one of your directories). I tried

[Haskell-cafe] Haskell Weekly News: Issue 280

2013-09-18 Thread Daniel Santa Cruz
Welcome to issue 280 of the HWN, an issue covering crowd-sourced bits of information about Haskell from around the web. This issue covers the week of September 8 to 14, 2013. Quotes of the Week * haasn: edwardk uses things in anger. shachaf uses them with disappointment :( * shachaf:

[Haskell-cafe] ANN Vigilance: Get notified when periodical tasks fail to run successfully

2013-09-18 Thread Michael Xavier
Hey Cafe, Just wanted to announce a project I've been tinkering with for a while finally got to a state where I felt comfortable releasing it. Vigilance is a Dead Man's Switch system that notifies you when periodical tasks that fail to check in when you expected them to. An example of this could