I am new to OCaml. And I am writing a simple assembler compiler. I have the following types which I use in my AST. I think types are good because t ...
I am new to OCaml. And I am writing a simple assembler compiler. I have the following types which I use in my AST. I think types are good because t ...
I'm trying to extend the classic GADTs example around eval-ing a Value, but I'm hitting something I don't fully understand. data Command a where ...
(Scala 2.12.8) Full Example So lets say you have some "TypeEvidence" for some specific concrete types: I can match on those evidence objects like ...
Say I have a monad that emits soft failure through Writer. A simplified version goes like this (for the record, I'm using GHC 9.0.2): {-# LANGUAGE Bl ...
Following code does not appear as compiling in IntelliJ. It is complaining that the type returned from the eval should be A where I would expect it to ...
I have the following peano number written with GADTs: type z = Z of z type 'a s = Z | S of 'a type _ t = Z : z t | S : 'n t -> 'n s t module T ...
In this question, it was explained to me how to correctly pattern-match GADT types to get alternative return types using universally quantified type v ...
I want to exploit GADT to implement the type ('a, 'b) liInstr_t in order to hold various types of instructions which are recursively decoded into basi ...
There is a relevant question concerning Functional Dependencies used with GADTs. It turns out that the problem is not using those two together, since ...
https://youtu.be/brE_dyedGm0?t=1362 data T a where T1 :: Bool -> T Bool T2 :: T a f x y = case x of T1 x -> True T2 -> y Simo ...
Please look at the code. I believe using phantom type makes the pattern matching irrefutable so there is no need in MonadFail instance. But I am ge ...
Given this GADT Why is it that this fails with a "type constructor would escape its scope" error while this, which just extracts the pattern m ...
I'm trying to define a Complex datatype, and I want the constructors to be able to take any number as instance, so I would like to use a generic type ...
I'm looking at GADT definitions, and they use objects instead of records. I was wondering why, as it seems like objects are pretty much never used in ...
How to write Haskell code like (with language extension GADTs and MultiParamTypeClasses): class MyClass f a where func :: a -> f a data ...
Context I want to model the routes of a web application such that it satisfies the following requirements: Can enforce complete definitions Can ...
I have a matrix representation of where Product makes sure dims is equal with n when you take the product of all the elements of dims. Now I would ...
I would like to have a tensor data structure A tensor is represented by a list of elements and a list of integers representing the dimensions of th ...
So I have a data constructor that I only use at the type level which contains a Nat. Normally if I pass this around at the type level and I want to re ...
Here's the code Here's the error I'm hoping the answer is to include missing type information, but I'm not really sure. Any ideas? Update: I im ...