Scalaz: how do I use `traverseS` on regular scala List?

Question

If I have a plain scala List[A] (i.e. scala.collection.immutable.List) and I have some state monad State[S,B]. I'd like to use Scalaz's specialized traverseS ala:

val stuff: scala.collection.immutable.List[Int] = List(1,2,3)
val state: State[S,A]
stuff.traverseS(i => modify { ... })

What do I need to import to convert scala.collection.immutable.List to Scalaz's List? I couldn't find searching through GitHub and I wasn't able to get it working with trying to import carte blanche. Perhaps I'm missing something obvious.

Thanks for your help.

Answer 1

scalaz doens't have its own list implementation. Likely you just need to import the list typeclass instances with import scalaz.std.list._ and the traverse syntax with import scalaz.syntax.traverse._