All Questions
18 questions
1
vote
2
answers
110
views
understand haskell logic behind odd's and even's index lists
I had a question in haskell that asks a function to divide a list in two different lists so the even indexs filled a list and the odd ones another.
Example:
func :: [Int] -> ([Int], [Int])
Then, ...
1
vote
0
answers
170
views
What is wrong with my "token type" in Happy?
I am writing a simple arithmetic expression parser in the Haskell platform's Happy. The Happy tutorial (labeled "Documentation") from the Haskell site implements a similar grammar to what I ...
- 13
1
vote
1
answer
487
views
Failed to build Distribution.Simple package using stack in Haskell
the stack command stack new my-project creates a auto-generated file Setup.hs with contents:
import Distribution.Simple
main = defaultMain
but my vs code intellisense just tells me
Could not load ...
- 43
5
votes
0
answers
2k
views
cabal version 3.2: unrecognised command: sandbox (try --help)
Following this tutorial http://wiki.haskell.org/How_to_write_a_Haskell_program#Recommended_tools but not able to run cabal sandbox init. I have the latest version of cabal installed on my Mac and ...
- 2,272
3
votes
2
answers
596
views
Can standalone Haskell Executable run across Machine having the same OS?
NOTE: I am using Stack.
When we do (say on a CentOS machine)
stack install --ghc-options='-optl-static -optl-pthread' --force-dirty --local-bin-path path-to-executable(my-project-exe)
Can the newly ...
- 31
1
vote
1
answer
237
views
When I tried to compile a Haskell file , error:parse error on input '#'
I was learning how to use this SDK from https://github.com/spaceships/garbled-circuits
When I finished downloading the dependencies and tried to compile one example, the error was like parse error on ...
- 11
2
votes
2
answers
3k
views
How to get the current UTC time in Haskell?
i want to use system time in my code for having the record of time when the data is captured from the user interface.how to get system time using Haskell.
- 161
-1
votes
1
answer
202
views
Haskell. Implement a function that takes a string as input and expands its compressed representation
Implement a function (myData2Fun) that takes a string as input and expands its compressed representation according to the rules for encoding series lengths. The essence of compression is that ...
- 97
1
vote
1
answer
2k
views
Haskell error - 'parse error on input `->'
I am trying to declare a function in Haskell GHCi as
fact :: Int -> Int
But I am getting this error - error: parse error on input `->'
I do not understand why this is happening. Can anyone ...
- 11
4
votes
1
answer
796
views
Undefined symbols for architecture x86_64: "_utimensat", referenced from: _cazW_info in libHSdirectory-1.3.3.0.a(Posix.o)
I'm trying to install haskell-ide-engine. Below are the commands
git clone https://github.com/haskell/haskell-ide-engine --recursive
cd haskell-ide-engine
./install.hs build-all
The last command ./...
- 10.3k
0
votes
1
answer
304
views
Basic question on executing multiple commands in Haskell
I have the following on my code:
where
launch :: MonadIO m => m (Maybe Text)
launch = do
line <- launchLine
return $ lineToText <$> line
launchLine :: ...
- 103
1
vote
1
answer
260
views
How does haskell-platform use Stack?
The page: https://www.haskell.org/platform/ claims that haskell-platform comes with the Stack tool. However, on my Debian system after installing the haskell-platform package, I do not have the ...
- 4,128
4
votes
1
answer
1k
views
Stack always downloads ghc even though it is in path
I want to use Haskell on my computer currently running Windows 10 build 1803, and I am using a broadband connection of 25 Mbps. As of 2018, the Haskell compiler version known as ghc is 8.4.3.
First ...
- 45
2
votes
1
answer
1k
views
Installing and running a haskell package offline
I'm trying to run duckling (https://github.com/facebook/duckling) on a Windows server.
Unfortunately, the server only has intranet access and no internet access. How do I set up Haskell to be able ...
- 268
25
votes
2
answers
12k
views
How to install Haskell (Platform or Stack) in 2018 on Linux?
I am trying to learn Haskell from the book Learn You a Haskell by Miran Lipovača. Both the book and haskell.org recommends installing the Haskell Platform but there is no download for Manjaro Linux (...
- 579