I cannot fix this error. build.sh is trying to create a shared library but it fails: ~/Desktop/deepseek$ ./build.sh Building Haskell shared library... Loaded package environment from /home/success/....

I need help with some haskell syntax. I have a really long type signature and I need a quick way of making sure that the parts of it which are equal are represented in the signature itself. Signature: ...

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 #-} {-# ...

Here is the question from Mitchell Wand's Essentials of Programming Language: Exercise 1.19 [⋆ ⋆] (list-set lst n x) returns a list like lst, except that the n-th element, using zero-based indexing, ...

I need a function of type linearJoin :: (ctx,Functor n,Functor m,Functor x) => (forall a. n (m a) -> x a) -> t n (t m a) -> t x a A bind version would look like this linearBind bindfun f k ...

I'm looking into associated type families. As an own learning example, I try to model a small part of the x86 assembly language. This compiles: {-# LANGUAGE TypeFamilies #-} {-# LANGUAGE ...

In Haskell, how should one test the equality of two infinite lists? With finite lists, one might try: listEqual :: Eq a => [a] -> [a] -> Bool listEqual l0 l1 = and $ zipWith (==) l0 l1 But ...

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 ...

So this is the data definition and my function. Task 3 Define addAll, which adds a list of expressions together into a single expression without introducing any 'junk'. You could use foldr since it ...

I had a nice idea of using applicative for nondeterministic financial modelling. Or maybe it is a simple case of sentization. So the basic example is to define newtype ValueRange. newtype ValueRange a ...

Fur fun and education I'm trying to write a mini compiler with the final tagless method as described by Oleg Kiselyov in his paper Typed Tagless Final Interpreters. My grammar has expressions and ...

Consider this Haskell code that compiles successfully: {-# LANGUAGE RankNTypes #-} -- Applies a polymorphic function to different types, expecting 3 constraints applyToMany :: (forall a. (Show a, Eq ...

The following program assumes that /path/to/mypipe is a named pipe, e.g. created via mkfifo /path/to/mypipe, with no readers/writers waiting yet, runs two threads, of which the main thread keeps ...

MRE: module Temp where data Some r a = Thing r a instance Monad (Some r) where return :: a -> Some r a return a = Thing r a -- <- The is a phantom argument (somewhat like the s in ...

Suppose, we have 2 lists of lists: a = [[1,2], [3,4]] b = [[5,6], [7,8]] We want to merge every element of the first list with every element of the second list and get: c = [[1,2,5,6], [1,2,7,8], [3,...