Re: [Haskell-cafe] GHC flags: optghc

That's not a GHC flag; it's a haddock flag. Haddock (which, in case you're not familiar with it, is a program to generate documentation from Haskell source code) uses GHC, and the `optghc` flag lets you pass options to GHC when you invoke Haddock. See [the Haddock docs of the 6.12 era][1], on page

Re: [Haskell-cafe] enumerators: exception that can't be catched

This is partially guesswork, but the code to catchWSError looks dubious: catchWsError :: WebSockets p a -> (SomeException -> WebSockets p a) -> WebSockets p a catchWsError act c = WebSockets $ do env <- ask let it = peelWebSockets env $ act cit = pe

Re: [Haskell-cafe] mapping a concept to a type

I wonder if you want a typeclass here, rather than a type? A Normal Rule is pretty much a State Transformer, while a Meta Rule seems like a higher-order function on Normal Rules[*]. These are different kinds of things --- and I say "kind" advisedly --- so perhaps better to define the specific commo

Re: [Haskell-cafe] Installing pandoc / json with ghc 6.12.1

> > Am I doing something wrong here? Well, you're using ghc-6.12 ... :-) The most recent version of pandoc that Hackage claims to have built with ghc 6.12 looks to be 1.6. Rolling back that far eliminates the json dependency entirely, so I think it would solve your issue. Or you could use the Pa

Re: [Haskell-cafe] Monads with "The" contexts?

On Thu, Jul 12, 2012 at 11:01 AM, Takayuki Muranushi wrote: > > sunPerMars :: [Double] > > sunPerMars = (/) <$> sunMass <*> marsMass > > Sadly, this gives too many answers, and some of them are wrong because > they assume different Earth mass in calculating Sun and Mars masses, > which led to inco

Re: [Haskell-cafe] Undo records

I think acid-state (http://hackage.haskell.org/package/acid-state) might do what you want, at least in broad strokes. It uses a durable transaction log to store query and update events. As far as I know, the interface to the library doesn't expose an undo/rollback function, so you'd have a bit of

Re: [Haskell-cafe] haskell build phase is very slow

yi is pretty heavy, as these things go. So it's not too surprising that it's taking a while. GHC does try to recompile as little as possible...but "as little as possible" can be quite a lot. Inlining, and other optimizations GHC performs, makes the recompilation checker's job tricky; see [1]. Gene

Re: [Haskell-cafe] Backward compatibility

You might want to check out FPComplete, if you haven't already. They're far more focused on making it easy for organizations to adopt Haskell than the community can be. As they say: "Where the open-source process is not sufficient to meet commercial adoptio

Re: [Haskell-cafe] Backward compatibility

ttle, he ought to know where to hire some mercenaries. On Sat, May 4, 2013 at 2:03 PM, Carter Schonwald wrote: > What pray tell are those missing pieces? Aren't they mostly building a > browser based ide plus doing training courses ? > On May 4, 2013 1:42 PM, "Ben Doyle"

Re: [Haskell-cafe] Teaching FP with Haskell

Helium seems interesting, but the code is a little stale, no? The last updates seem to be from 2008-2009. I couldn't get it to build with ghc 7.6.3, not that I tried too terribly hard. On Tue, May 21, 2013 at 6:07 AM, Andrew Butterfield < andrew.butterfi...@scss.tcd.ie> wrote: > Rustom, > you s