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In a [question](https://stackoverflow.com/questions/63191868/array-aggregation-across-a-link-table-in-opaleye/63230859#63230859) I posted on Stackoverflow, I used a rather complicated expression
```
…
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It is statically determined if the traversal is definitely non-empty. In this case we could generate a `Traversal1` which can then be used with `first1Of` for example.
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After updating the stack.yaml to a format compatible with stack 1.11+, still get this error when trying to build:
```
Stack looks for packages in the directories configured in
the 'packages' and …
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Hello! I've tried a few things to install this since FARM and have no success yet on Windows 10 unfortunately, although I've made some progress from my initial installation problems by switching from …
donya updated
6 years ago
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Consider using a primitive such as `spark#`. Without `-XMagicHash`, on GHC 9.2.1, I get the following error:
```
src/Rtq/Internal.hs:172:31: error:
Variable not in scope:
(#) :: t0 -> t1…
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Referring to https://github.com/nomicflux/servant-opaleye-blog/blob/lesson2_opaleye/README.md#step-55-set-up-conversions what if I need the write data-type (i.e. `BlogPostWrite` in this example) to no…
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`SelectT` is in http://hackage.haskell.org/package/transformers-0.5.4.0/docs/Control-Monad-Trans-Select.html but is missing from `transformers type Select r a = ((a -> r) -> a)
Djinn> ?dimap :: (a->b…
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I have a need to use the lens machinery on the pandoc definition data types. I am doing technical writing (aviation) against the pandoc syntax tree (`Text.Pandoc.Definition`). I know there is a `pand…
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As @Gabriel439 explained in https://github.com/dhall-lang/dhall-haskell/issues/1096#issuecomment-510963407:
> the main issue we're running into is that the dhall package is actually doing two sepa…
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not sure how this happens yet:
```
Process failed: cabal install --ghc-options=-j1 --max-backjumps=0 lens-4.15.4 --constraint adjunctions == 4.4 --constraint base-orphans == 0.7 --constraint bifun…