Category "typeclass"

How to implement subtype resolution of typeclass in scala

I want to understand how to go about implementing the following use-case using typeclasses in Scala (or find out if it is even possible). Given a sealed trait a

Instantiate type classes in locale contexts

Suppose I have some locale where a type-class can be inferred from the assumptions. locale some_locale = fixes xs :: "'x list" assumes xs_contains_UNIV: "se

Making instance of Applicative

Still not a hundred percent shure how to make instances of the more complex types. Have this: data CouldBe a = Is a | Lost deriving (Show, Ord) Made an ins