Difficulty in Implementing Custom Typeclass Instances for Validation in Scala 3.1.0
I'm stuck trying to I'm stuck on something that should probably be simple. I'm deploying to production and I'm refactoring my project and I'm having trouble with I'm relatively new to this, so bear with me... I'm trying to implement a custom typeclass for validation in Scala 3.1.0, but I'm running into issues with the implicit resolution of the instances. I have defined a simple typeclass named `Validator` and specific instances for `String` and `Int`. However, when I try to summon the validator for a case class that contains both types, I get a `No implicit argument of type Validator[YourCaseClass]` behavior. Here's what I have so far: ```scala trait Validator[A] { def validate(value: A): Boolean } object Validator { implicit val stringValidator: Validator[String] = new Validator[String] { def validate(value: String): Boolean = value.nonEmpty } implicit val intValidator: Validator[Int] = new Validator[Int] { def validate(value: Int): Boolean = value > 0 } } case class YourCaseClass(name: String, age: Int) object YourCaseClass { implicit val caseClassValidator: Validator[YourCaseClass] = new Validator[YourCaseClass] { def validate(value: YourCaseClass): Boolean = implicitly[Validator[String]].validate(value.name) && implicitly[Validator[Int]].validate(value.age) } } def validate[A](value: A)(implicit v: Validator[A]): Boolean = v.validate(value) val instance = YourCaseClass("Alice", 25) println(validate(instance)) // This line throws the No implicit argument behavior ``` I've double-checked that I have imported the implicit `Validator` instances into scope, but for some reason, the compiler isn't able to find the `caseClassValidator` instance. Is there a special way to define or summon implicits in Scala 3 that I'm missing? Any insights or best practices for working with typeclass instances in this context would be greatly appreciated. My development environment is Ubuntu. Thanks in advance! I'd really appreciate any guidance on this. I'm using Scala 3.9 in this project. I've been using Scala for about a year now. Thanks, I really appreciate it! This is happening in both development and production on Ubuntu 22.04. I'm open to any suggestions. I'm developing on Linux with Scala.