picopickle

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Following code results in lockup when compiling (phase typer):

case class Recipe(title: String, description: Option[String] = None, ingredients: Seq[Ingredient],
        directions: Seq[String], images: Option[Seq[String]] = None)

val baseRecipe = new Recipe(title = "A Recipe", description = Option(""), ingredients = Seq(),
    directions = Seq(), images = None)

val write1 = writeString(baseRecipe)

Thanks, I'll look into it. Although these errors are very hard to debug and fix in Scala, unfortunately - lots of macro and implicit machinery are deeply magical and can refuse to work for no apparent reason whatsoever.

As a workaround, you can try adding explicit instantiations of Reader/Writer, like this:

object CustomPickler extends JsonPickler {
  // write here readwriters for other custom types which Ingredient depends on
  implicit val ingredientReadWriter = ReadWriter[Ingredient]
  implicit val recipeReadWriter = ReadWriter[Recipe]
}

CustomPickler.writeString(baseRecipe)

It may work but it may just as well not. Could you also please give the definition of Ingredient and other custom case classes which are transitively used by it?