Unhelpful "This old given syntax is no longer supported" warning

[slavaschmidt]

Compiler version

3.6.4

Minimized example

sealed trait IsVal[A]:
  type V
  def cons(v: V): A
  def decons(a: A): V

abstract class Get[A]:
  def map[B](f: A => B): Get[B]

object Mappings:
  given [A](using wrapped: IsVal[A], get: Get[wrapped.V]): Get[A] = get.map(wrapped.cons)

Output Error/Warning message

This old given syntax is no longer supported; use `=>` instead of `:`
  given [A](using wrapped: IsVal[A], get: Get[wrapped.V]): Get[A] = get.map(wrapped.cons)

Why this Error/Warning was not helpful

The message was unhelpful because it does not show how to use the new syntax (or if it is possible at all).

[mobilemindtec]

Hi!

I'm taking this message and trying to switch to new syntax.. How to add a using in this case?

// Old sintax

given OptionValidator[A: Validator](using
      msg: ValidatorMessages
  ): FieldValidator[Option[A]] =
    new FieldValidator[Option[A]]:
      def validate(
          fieldName: String,
          validations: Seq[validation],
          value: Option[A]
      ): Either[Seq[String], Unit] = Right(())

// New sintax, where do i put the using?

given OptionValidator: [A: Validator] => FieldValidator[Option[A]]:
      def validate(
          fieldName: String,
          validations: Seq[validation],
          value: Option[A]
      ): Either[Seq[String], Unit] = Right(())

[mobilemindtec]

Looks like I figured it out, is that it?

  given OptionValidator: [A: Validator] => (msg: ValidatorMessages) => FieldValidator[Option[A]]:
      def validate(
          fieldName: String,
          validations: Seq[validation],
          value: Option[A]
      ): Either[Seq[String], Unit] = Right(())