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2 votes
0 answers
102 views

I am a beginner Haskell programmer on Windows 11. I am writing a Snakes & Ladders program, and am attempting to set up a Stack environment to work in. I have been following this guide, as well as ...
5 votes
2 answers
284 views

disjointCollisions :: Eq k => Word -> Array (Leaf k a) -> Word -> Array (Leaf k b) -> Bool I would like this function to be specialized (to arbitrary unknown key types k) but never ...
2 votes
1 answer
67 views

The following program gets the error: "Illegal term-level use of the type constructor or class ‘IOError’" even though it's right out of the source to ghc: {-# LANGUAGE Trustworthy #-} {-# ...
davidg's user avatar
  • 63
4 votes
2 answers
113 views

Problem: Can't avoid a module cycle with class definitions in Haskell. Foo.hs contains: module Foo where import {-# SOURCE #-} Bar class FooClass a where ... myBar :: BarClass -> a -- use a ...
1 vote
1 answer
84 views

This question tries to collect the full picture if/when a stale object reference can happen from an old-gen (immutable) array referring a newer-gen object, from fragments of information. Preface: was ...
3 votes
2 answers
108 views

I'm familiar with the SPECIALIZE pragma, or INLINE/INLINABLE that might enable automatic specialization at the use-site. But those are about specializing functions for type variables taking special ...
ron's user avatar
  • 9,458
2 votes
2 answers
107 views

So I have a project in Haskell, and I was using make to build it, but then I switched the project over to use Cabal as someone recommended to me on another Stack Overflow post. It is an FFI project, ...
2 votes
1 answer
57 views

I have been making a Haskell project that I want to continue on in C at some point through the FFI. I wanted to create a makefile to compile all the source with Clang for C and GHC for Haskell. The ...
7 votes
2 answers
223 views

In Haskell in Depth, Chapter 11, there's an example aimed at avoiding character escaping in GHCi, which is what happens automatically when you enter print "ë", as it'll be printed like "...
7 votes
1 answer
197 views

We are working on some programs that do rewriting logic, where there is a state (often complex), a set of rules that match certain patterns in this state, and strategy for applying these rules to ...
cjs's user avatar
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2 votes
1 answer
73 views

I would like to create a virtual record field "r" for the red component of a color using the Color package. This package uses a data family Color. I tried to write the following : import GHC....
4 votes
1 answer
126 views

Using GHC 9.6.2 and looking at the GHC Core output, I see a lot of break<N>, where N is a small integer. What does this mean? For example, from a source definition: type Store = Map Id Integer ...
cjs's user avatar
  • 27.9k
4 votes
2 answers
120 views

How to understand p r -> t and p t -> r in PFunctor p r t | p r -> t, p t -> r? https://github.com/ekmett/categories/blob/4a02808d28b275f59d9d6c08f0c2d329ee567a97/old/src/Control/...
2 votes
1 answer
80 views

In Parallel and Concurrent Programming in Haskell by Simon Marlow, chapter 7 starts at page 125 with this example, import Control.Concurrent import Control.Monad import System.IO main :: IO () main = ...
1 vote
0 answers
50 views

I get following error in VSCode: However, when I run this command in shell manually it works fine: % stack --stack-yaml /home/user/haskell/h5/stack.yaml exec ghc -- --numeric-version 9.8.2 My stack....

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