I am recovered. My bone marrow biopsy and my scan at the National Amyloidosis Centre show no problems, and my urologist has discharged me. Photo above shows me and Bob Harper (otherwise known as TSOPLRWOKE, The Society of Programming Language Researchers With One Kidney Each) at Asilomar for Snapl.
My thanks again to staff of the NHS. Everyone was uniformly friendly and professional, and the standard of care has been excellent. My thanks also to everyone who wished me well, and especially to the SIGPLAN EC, who passed a get-well card around the world for signing, as shown below. I am touched to have received so many good wishes.
Related: Status Report, Status Report 2, A paean to the Western General, Status Report 3, Status Report 4.
It seemed as if no time had passed: the anaesthetist injected my spine, and next thing I knew I was waking in recovery. Keyhole surgery to remove my left kidney was completed on Tuesday 17 March, and I expect to leave the Western General on Saturday 21 March. Meanwhile, progress on diagnosing the amyloid spotted in my liver: I had a bone marrow biopsy on Thursday 19 March, and two days of testing at the National Amyloidosis Centre in London are to be scheduled. NHS has provided excellent care all around.
My room was well placed for watching the partial eclipse this morning. A nurse with a syringe helped me jury rig a crude pinhole camera (below), but it was too crude. Fortunately, there was exactly the right amount of cloud cover through which to view the crescent sun. My fellow patients and our nurses all gathered together, and for five minutes it was party time on the ward.
Update: I left the hospital as planned on Saturday 21 March. Thanks to Guido, Sam, Shabana, Stephen, and Jonathan for visits; to Marjorie for soup; to Sukkat Shalom council for a card and to Gillian for hand delivery; and to Maurice for taking me in while my family was away.
Related: Status report, Status report 2, A paean to the Western General, Status report 3.
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We are looking for a haskell developer to work on a privacy-preserving user data management / single-sign-on system.
We are looking for a full-time free-lancer physically located in Berlin, Germany and able to start immediately, but remote work and other arrangements may be possible. Let us know your preferences!
We are four developers after this hire (plus product ownership / management). We are operating out of a small office in Berlin-Neukölln and a co-working space for the spill-over, and are planning to move to a new office later this year.
We are looking for somebody with experience in Haskell (or at least in related languages), a passion for effective and beautiful code, willingness to be productive (sorry for the cliches), and both strong opinions and the ability to compromise.
Some of the relevant topics are cryptography, network protocols, information flow control and authorization control. You should least at see yourself developing an interest in these; but we are not looking for a specialist and will give you some time to figure things out.
Please apply to:
Dr. Matthias Fischmann firstname.lastname@example.org Primary key fingerprint: 4185 93B1 BBF5 D064 62B6 9FA6 0DE4 AA9C 5446 EBF4
Applications should include one to three pieces of software, including at least one that you are fond of and one written by you (the two can be the same, but do not have to). The Interviews will include one conversation about the code you submit, and one about thentos or one of the core libraries we use.submitted by 34798s7d98t6
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First a bit about me. I am currently working as a web developer, I haven't had any formal CS education, and I basically suck at programming in general.
I was unemployed for a couple of months and I decided to learn Haskell, just to see what all the fuss was about. I followed the usual path (Learn you some Haskell, Real World Haskell) and failed miserably. Not that the books are bad, it's just that I am old and stupid.
Then I started working on a Java project...
What I kept thinking is what it would be like to try and explain Java (or any other imperative language) to someone that the first language that they learned was Haskell ("...but of course it makes sense to say that x = x + 1")...
What kind of developers would the next generation be, if their first programming language is Haskell?
I am the father of a 4 year old and I would love to be able to teach Haskell to my child when he is old enough. But for that to happen some things need to change, and a lot more need to happen...
The most important thing that is required in my opinion is a programming environment that is accessible and easy to use, I think that why the lucky stiff with his Hackety Hack project was in the right path, and also the guidelines set forth by Bret Victor (http://worrydream.com/#!/LearnableProgramming) is the way that the next generation should be taught coding.
A question is how do you explain concepts such as Monad and Functor to a child... Well, you don't. All children that write code will use derivatives, integration and a fair amount of linear algebra in their code without knowing anything about calculus or linear algebra.
That is what is beautiful and important about coding, you first discover and use concepts and when the time comes you learn the formal definitions.
So I would like to ask from all Haskell developers to take some time and consider the next generation of developers, our children. How will they code, how will they think about software...submitted by nikosquant
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Can parametricity be used to explain the difference between (<*>) :: f (a -> b) -> f a -> f b and (>>=) :: m a -> (a -> m b) -> m b? More concretely, can it be proven that the function in f (a -> b) is always independent of the other term, while the lifted function (a -> m b) can always depend on the other term?
I want to use this to say something about the context-free-ishness of applicative parser combinators, and why it's so hard to optimize the grammar of a monadic parser combinator.submitted by vincentrevelations
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Hi. I am attempting to install Hakyll on my Chromebook's Ubuntu 14.04 chroot and I keep running into issues. I also ran into this problem when attempting to install on my 14.04 DigitalOcean droplet, but did not have this issue on my Manjaro install on my big PC.
My order of operations was to apt-get install haskell-platform and then cabal update and cabal install hakyll. The last command has a lot of dependencies that it attempts to install and it does work successfully, but when it gets to pandoc I get this error:$ cabal install hakyll Resolving dependencies... [1 of 1] Compiling Main ( /tmp/pandoc-184.108.40.206-12343/pandoc-220.127.116.11/Setup.hs, /tmp/pandoc-18.104.22.168-12343/pandoc-22.214.171.124/dist/setup/Main.o ) Linking /tmp/pandoc-126.96.36.199-12343/pandoc-188.8.131.52/dist/setup/setup ... /usr/lib/ghc/unix-184.108.40.206/libHSunix-220.127.116.11.a(execvpe.o): In function `pPrPr_disableITimers': (.text+0x300): multiple definition of `pPrPr_disableITimers' /root/.cabal/lib/unix-18.104.22.168/ghc-7.6.3/libHSunix-22.214.171.124.a(ghcrts.o):ghcrts.c:(.text+0x0): first defined here collect2: error: ld returned 1 exit status Failed to install pandoc-126.96.36.199 cabal: Error: some packages failed to install: hakyll-188.8.131.52 depends on pandoc-184.108.40.206 which failed to install. pandoc-220.127.116.11 failed during the configure step. The exception was: ExitFailure 1 pandoc-citeproc-0.7.1 depends on pandoc-18.104.22.168 which failed to install.
This error seems to be similar to the error in this post, but I am not really sure how to fix it. I am still getting my feet wet with Haskell in general and this is my first time using cabal to install anything (and use anything outside of the default packages).
I would appreciate it if someone could guide me on how to resolve this error. Thanks in advance.
EDIT: So I gave up on trying to fiddle around with the haskell-platform and ghc 7.6.* and whatever version of cabal that it comes with. I found this Gist describing how to install ghc 7.10.1 and cabal 22.214.171.124 from source. I followed the instructions (just ran all the commands in order) and they worked on Ubuntu 14.04 perfectly.
EDIT 2: So because this whole compilation/installation process required over 1 GB of RAM, to get this running on my DigitalOcean droplet I had to shut it down and scale it up from 500 MB to 2 GB. When the process was done I scaled it back down and it appears that doing so broke ghc (I tested it right before and right after scaling it back down). I assume it will still work on my Chromebook, so I am fine if that is the case.submitted by AIDS_Pizza
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I read in A Book of Abstract Algebra, by Prof. Charles Pinter, that:
If f and g are functions from Real to Real, then f and g are equal if and only if f(x) = g(x) for every real number x.
When I tried to compare functions in ghci, I saw this compile-time error:Prelude> let f x = "foo" Prelude> let g x = "foo" Prelude> f == g <interactive>:7:3: No instance for (Eq (t0 -> [Char])) arising from a use of `==' In the expression: f == g In an equation for `it': it = f == g
Is it simply too much work, not possible, to compare every input for the compiler? Or it's out of the compiler's scope?submitted by kevin_meredith
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I'd like a function that takes an Integer and gives back the number of digits in it. Here's the output from my ghci session:GHCi, version 7.6.3: http://www.haskell.org/ghc/ :? for help Loading package ghc-prim ... linking ... done. Loading package integer-gmp ... linking ... done. Loading package base ... linking ... done. Prelude> :t (length . show) (length . show) :: Show a => a -> Int Prelude> let digits = length . show Prelude> :t digits digits :: () -> Int Prelude>
So, length . show has the right type on its own, but when I bind it to the name digits, it suddenly gets a much more restrictive type. What causes this, and how can I avoid it?
Sure, it works if I just specify the type I want, but I'm surprised that the type inference gets it right some of the time and wrong other times.submitted by penguinland
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