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The library has a `Traversing` typeclass with two methods:
```hs
traverse' :: forall a b g. Traversable f => p a b -> p (f a) (f b)
wander :: forall s t a b. Traversal s t a b -> p a b -> p s t
``…
mniip updated
3 weeks ago
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Forgive me if this issue turns out to be totally asanine; I'm new to this.
I created a new stack project, set the resolver to ghc 8.0.2, and tried to `stack build ghc-mod`. No luck - it failed to …
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I'm trying to return some data from my database representing a one-to-many relation, and am trying to do it in a single query, but don't see how to accomplish it. There is `arrayAgg :: Aggregator (Fie…
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Using current cabal at c2dfc3310b71193a491424dddb8c4ab868c55b6e built with GHC 8.0.2,
configuring for use with GHC ghc-8.2 branch at b3f7e9b54d9f36938effd265c84d5567b34c905b, with a brand new insta…
alanz updated
2 years ago
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`cabal install` is throwing the following error:
```
cabal: Distribution/Simple/PackageIndex.hs:163:30-35: Assertion failed
```
Line [163](https://github.com/haskell/cabal/blob/master/Cabal/Distribu…
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I am getting the following error message when I use cabal run in WSL 2.0 in Windows.-
```
cabal run mywork
Build profile: -w ghc-9.2.8 -O1
In order, the following will be built (use -v for more d…
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``` shell
cody@cody-G46VW:~/source/unsorted/leksah$ stack install
While constructing the BuildPlan the following exceptions were encountered:
-- Failure when adding dependencies:
gtk3: nee…
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This is with Haskell Platform 2014.2.0.0, ghc 7.8.3, cabal 1.20.0.3, Windows Server 2008 R2.
## The working setup
As of 0f5367cd57
network-2.4.2.3 is preinstalled.
But without trifecta >=1.5.1.2 or…
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I'm trying to run the demo application on Mac OS X 10.10.2, and I get a segmentation fault. The display window opens with just a black background, and then crashes.
Here's [a gist](https://gist.githu…
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**Describe the bug**
Using backpack often requires using large large numbers of reexported-modules stanzas and mixins stanzas.
If you use a backpack package and that package produces 17 outputs in…