I'm currently writing a configuration for xmonad. I wanted to make a variable color theme config, so I made each color theme a type, eg data Dracula = ...

I have a query I'm running in Hasql using Hasql.TH, and I'm encountering an error I've never seen before (see below). I'm seen this SO question/answer ...

Suppose I have a type with many constructors and a few pattern synonyms. I'd like to use pattern synonyms to replace a few of the constructors. How ca ...

While going through the examples of the Yesod Book, I'm running into an issue with the following snippet: (It's on page 124 of 598; route arguments ...

I can figure out what most literals represent with ppr, e.g. WordPrimL 7 = 7##, CharPrimL 'x' = 'x'#, etc. The only constructor I can't figure out is ...

I have a web application written in Haskell (using ghcjs on the client side and ghc on the server side) and I need a way to collect the CSS values whi ...

I do not understand why the DuplicateRecordFields language pragma is causing a compile time error in a template haskell splice. Example: When I re ...

I'm using template Haskell to generate data about a type. For many reasons I need the type to be used to be "normalized". So it shouldn't be a type al ...

I am trying to install the specific version template-haskell-2.17.0.0. I run this command, but get an error during dependency resolution: I'm using ...

I have a call myFun @m @d. And now I want to code it for my template Haskell. I try let myFunCall = AppTypeE (VarE $ mkName "myFun") (AppT (VarT $ mk ...

I have a 'QuasiQuoter' which is useful in source code in Haskell, but also as a standalone application. So, I need to be able to run QuasiQuoter D ...

I would like to list all fixity declarations in Quasiquote monad so I am able to pass all the infix operators from Haskell grammar to my Quasiquote gr ...

Normally in Haskell, tuples of length one aren't allowed (AFAIK). However, when messing with Template Haskell, I got this: oneElementTuple = $(do{ ...

I can write an instance -- In Data.Sequence.Internal instance Lift a => Lift (Seq a) where ... letting users lift fully realized sequences int ...

Very specific use case: I'm building an autotester system, where students submit their assignments, which is automarked. However, VSCode will often i ...

When learning about Haskell lenses with the Optics package, i encountered the following example: data Person = Person { _name :: String , _age :: ...

I’m using the singletons and singletons-th libraries, and I want (if possible) to split a singleton definition between files. I tried creating a data ...

I am implementing a DSL that is based on using standard haskell functions/combinators to build database queries. From an implementation POV I decided ...

Let's say I have a class like Default There's a straightforward way to define instances for types that also have a Monoid instance, like but b ...

I was playing with musical note names having the goal to not confuse enharmonic equals, i.e. I wanted to get the accidentals (sharps and flats) right. ...