Search Results

Search found 71 results on 3 pages for 'ghc'.

Page 1/3 | 1 2 3  | Next Page >

• Evaluation of Haskell Statements/Expressions using GHC API

  - by Cetin Sert

  For a tool I'm writing ( http://hackage.haskell.org/package/explore ) I need a way to read haskell function definitions at run-time, apply them to values from my tool and retrieve the results of their application. Can anyone give me a very basic example using GHC (6.10.4 or 6.12.1) API? example function definition to be read from a file at…

  Read the article

• Haskell's cabal dependency problem with happy

  - by wirrbel

  I have problems installing ghc-mod on my linux machine. cabal worries about "happy" not being available in versione = 1.17: $ cabal install ghc-mod Resolving dependencies... [1 of 1] Compiling Main ( /tmp/haskell-src-exts-1.14.0-1357/haskell-src-exts-1.14.0/Setup.hs,…

  Read the article

• Getting Cabal to work with GHC 6.12.1

  - by Dan Dyer

  I've installed the latest GHC package (6.12.1) on OS X, but I can't get Cabal to work. I've removed the version I had previously that worked with GHC 6.10 and tried to re-install from scratch. The latest Cabal version available for download is 1.6.0.2. However, when I try to…

  Read the article

• List of GHC extensions

  - by yairchu

  I wanted to use {-# LANGUAGE OverloadedStrings #-} but I forgot how it's called. This kind of thing isn't hoogle-able, and also it takes some time finding using google*. Is there somewhere a list of GHC extensions named as they are in the LANGUAGE pragma? * My googling search…

  Read the article

• How to stop GHC from generating intermediate files?

  - by unknown

  When compiling a haskell source file via ghc --make foo.hs GHC always leaves behind a variety of intermediate files other than foo.exe. These are foo.hi and foo.o. I often end up having to delete the .hi and .o files to avoid cluttering up the folders. Is there a command line…

  Read the article

• ghc can't find my cabal installed packages

  - by nont

  I've installed ghc 6.12.3, and then the Haskell Platform. I'm trying to compile a test program: $ ghc test.hs test.hs:3:0: Failed to load interface for `Bindings': Use -v to see a list of the files searched for. so, naturally, I do cabal install Bindings Which…

  Read the article

• GHC 6.12 and MacPorts

  - by absz

  I recently installed GHC 6.12 and the Haskell Platform 2010.1.0.1 on my Intel MacBook running OS X 10.5.8, and initially, everything worked fine. However, I discovered that if I use cabal install to install a package which depends on a MacPorts library (e.g., cabal install…

  Read the article

• GHC.Generics and Type Families

  - by jberryman

  This is a question related to my module here, and is simplified a bit. It's also related to this previous question, in which I oversimplified my problem and didn't get the answer I was looking for. I hope this isn't too specific, and please change the title if you can think…

  Read the article

• ghc-pkg vs cabal

  - by Ben Lever

  In relation to how packages are created, installed and used in Haskell, what are the differences between ghc-pkg and cabal? When would you use one or the other or both? Are they complementary tools, competitive tools, or simply tools that do different jobs?

  Read the article

• How are lists implemented in Haskell (GHC)?

  - by eman

  I was just curious about some exact implementation details of lists in Haskell (GHC-specific answers are fine)--are they naive linked lists, or do they have any special optimizations? More specifically: Do length and (!!) (for instance) have to iterate through the list?…

  Read the article

• Demangling typeclass functions in GHC profiler output

  - by Paul Kuliniewicz

  When profiling a Haskell program written in GHC, the names of typeclass functions are mangled in the .prof file to distinguish one instance's implementations of them from another. How can I demangle these names to find out which type's instance it is? For example,…

  Read the article

• How can I compile a GUI executable with ghc?

  - by martingw

  I ported a little Haskell program I wrote from Mac to Windows. It's a GUI application (wxHaskell, compiled with ghc 6.12.1), so it does not need the command prompt window to open. It does so, anyway, so my question: What must I do so that the program starts without…

  Read the article

• Is do-notation specific to "base:GHC.Base.Monad"?

  - by yairchu

  The idea that the standard Monad class is flawed and that it should actually extend Functor or Pointed is floating around. I'm not necessarily claiming that it is the right thing to do, but suppose that one was trying to do it: import Prelude hiding (Monad(..)) …

  Read the article

• What is the relationship between ghc-pkg and cabal?

  - by Ben Lever

  With respect to how packages are created, installed and used in Haskell, what is the relationship between ghc-pkg and cabal? What are their roles - when would you use one, over the other, or use both? Are they complementary tools, competitive tools, or simply…

  Read the article

• How do you install GHC into Cygwin or point Cygwin to GHC?

  - by felix f

  I attempted to point the Cygwin installer to http://haskell.org/ghc/cygwin, but the installer was unable to find setup.ini.sig. If possible, how could I alternatively edit my .bashrc to reference an installation made using the setup binaries in C:/ghc/.

  Read the article

• What does the `forall` keyword in Haskell/GHC do?

  - by JUST MY correct OPINION

  I've been banging my head on this one for (quite literally) years now. I'm beginning to kinda/sorta understand how the foreach keyword is used in so-called "existential types" like this: data ShowBox = forall s. Show s => SB s (This despite the…

  Read the article

• CPP extension and multiline literals in Haskell

  - by jetxee

  Is it possible to use CPP extension on Haskell code which contains multiline string literals? Are there other conditional compilation techniques for Haskell? For example, let's take this code: -- If the next line is uncommented, the program does not…

  Read the article

• Wrong IO actions order using putStr and getLine

  - by QWRp

  I have a code : main = do putStr "Test input : " content <- getLine putStrLn content And when I run it (with runhaskell) or compile it (ghc 6.10.4) result is like this: asd Test input : asd I'm new to haskell and in my opinion…

  Read the article

• How does 'lazy' work?

  - by Matt Fenwick

  What is the difference between these two functions? I see that lazy is intended to be lazy, but I don't understand how that is accomplished. -- | Identity function. id :: a -> a id x = x -- | The call…

  Read the article

• In Haskell, what does it mean if a binding "shadows an existing binding"?

  - by Alistair

  I'm getting a warning from GHC when I compile: Warning: This binding for 'pats' shadows an existing binding in the definition of 'match_ignore_ancs' Here's the function: match_ignore_ancs (TextPat _ c) (Text t) = c t match_ignore_ancs…

  Read the article

• Curious about the HashTable problem

  - by astamatto

  I read that hash tables in Haskell had performance issues (on Jon Harrop's website), and since i like Haskell it worried me. That was a year ago, what is the status now (June 2010)? Has the "hash table problem" been fixed in GHC?

  Read the article

• [Haskell]Curious about the Hash Table problem

  - by astamatto

  I read that hash tables in haskell are crippled ( citation: http://flyingfrogblog.blogspot.com/2009/04/more-on-haskells-hash-table-problems.html ) and since i like haskell it worried me. Since the blog-post one year has passed and im…

  Read the article

• Manipulating source packages from Hackage how to easy deploy to several windowsboxes?

  - by Jonke

  Recently when I have found good sources packages for ghc 6.12/6.10 on Hackage I've been forced to do some minor or major changes to the cabal files to make those packages to work under windows. Besides to fork and merge my fixes with…

  Read the article

• Why does s ++ t not lead to a stack overflow for large s?

  - by martingw

  I'm wondering why Prelude> head $ reverse $ [1..10000000] ++ [99] 99 does not lead to a stack overflow error. The ++ in the prelude seems straight forward and non-tail-recursive: (++) :: [a] -> [a] -> [a] (++) [] ys…

  Read the article

• Printing a field with additional dots in haskell

  - by Frank Kluyt

  I'm writing a function called printField. This function takes an int and a string as arguments and then then prints a field like this "Derp..." with this: printField 7 "Derp". When the field consists of digits the output should be…

  Read the article

1 2 3  | Next Page >