Automated formatter derivation fails for case classes that extend a trait (or abstract class).

[crimzie]

import net.jcazevedo.moultingyaml._
import net.jcazevedo.moultingyaml.DefaultYamlProtocol._

abstract class Symbolic {
  val id: String
  val name: Map[String, String]
  val description: Map[String, String]
  val symbol: Option[Char]
  val iterator: Iterator[Symbolic]
}

case class Infl(
    id: String,
    name: Map[String, String],
    description: Map[String, String],
    symbol: Option[Char])
  extends Symbolic {
  override val iterator: Iterator[Symbolic] = Iterator.empty
}

object Infl {
  implicit val format: YamlFormat[Infl] = yamlFormat4(apply)
}

case class Cat(
    id: String,
    name: Map[String, String],
    description: Map[String, String],
    inflections: Seq[Infl])
  extends Symbolic {
  override val symbol: Option[Char] = None
  override val iterator: Iterator[Symbolic] = inflections.iterator
}

object Cat {
  implicit val format: YamlFormat[Cat] = yamlFormat4(apply)

  def fromYaml(res: String): Cat = {
    scala.io.Source.fromResource(res).mkString.parseYaml.convertTo[Cat]
  }
}

fails with

[info] com.crimzie.uni.model.DocsTests *** ABORTED ***
[info]   java.lang.ExceptionInInitializerError:
[info]   at com.crimzie.uni.model.Cat$.<init>(docs.scala:43)
[info]   at com.crimzie.uni.model.Cat$.<clinit>(docs.scala)
[info]   at com.crimzie.uni.model.DocsTests.$anonfun$new$2(DocsTests.scala:10)
[info]   at scala.util.Try$.apply(Try.scala:209)
[info]   at com.crimzie.uni.model.DocsTests.$anonfun$new$1(DocsTests.scala:9)
[info]   at org.scalatest.OutcomeOf.outcomeOf(OutcomeOf.scala:85)
[info]   at org.scalatest.OutcomeOf.outcomeOf$(OutcomeOf.scala:83)
[info]   at org.scalatest.OutcomeOf$.outcomeOf(OutcomeOf.scala:104)
[info]   at org.scalatest.Transformer.apply(Transformer.scala:22)
[info]   at org.scalatest.Transformer.apply(Transformer.scala:20)
[info]   ...
[info]   Cause: java.lang.RuntimeException: Case class com.crimzie.uni.model.Infl declares additional fields
[info]   at scala.sys.package$.error(package.scala:27)
[info]   at net.jcazevedo.moultingyaml.ProductFormats.fieldInfo(ProductFormats.scala:1052)
[info]   at net.jcazevedo.moultingyaml.ProductFormats.yamlFormat4(ProductFormats.scala:44)
[info]   at net.jcazevedo.moultingyaml.ProductFormats.yamlFormat4$(ProductFormats.scala:41)
[info]   at net.jcazevedo.moultingyaml.DefaultYamlProtocol$.yamlFormat4(DefaultYamlProtocol.scala:13)
[info]   at com.crimzie.uni.model.Infl$.<init>(docs.scala:59)
[info]   at com.crimzie.uni.model.Infl$.<clinit>(docs.scala)
[info]   at com.crimzie.uni.model.Cat$.<init>(docs.scala:43)
[info]   at com.crimzie.uni.model.Cat$.<clinit>(docs.scala)
[info]   at com.crimzie.uni.model.DocsTests.$anonfun$new$2(DocsTests.scala:10)
[info]   ...
[error] java.lang.NoClassDefFoundError: Could not initialize class com.crimzie.uni.model.Cat$
[error] 	at com.crimzie.uni.model.Docs$.<init>(docs.scala:83)
[error] 	at com.crimzie.uni.model.Docs$.<clinit>(docs.scala)
[error] 	at com.crimzie.uni.model.categories.Fnction$Noun$.<init>(Fnction.scala:10)
[error] 	at com.crimzie.uni.model.categories.Fnction$Noun$.<clinit>(Fnction.scala)
[error] 	at com.crimzie.uni.model.structures.Word$.apply$default$1(member.scala:14)
[error] 	at com.crimzie.uni.model.structures.ClauseTreeTests.$anonfun$new$1(ClauseTreeTests.scala:11)
[error] 	at org.scalatest.OutcomeOf.outcomeOf(OutcomeOf.scala:85)
[error] 	at org.scalatest.OutcomeOf.outcomeOf$(OutcomeOf.scala:83)
[error] 	at org.scalatest.OutcomeOf$.outcomeOf(OutcomeOf.scala:104)
[error] 	at org.scalatest.Transformer.apply(Transformer.scala:22)
[error] 	at org.scalatest.Transformer.apply(Transformer.scala:20)
[error] 	at org.scalatest.FlatSpecLike$$anon$1.apply(FlatSpecLike.scala:1682)
[error] 	at org.scalatest.TestSuite.withFixture(TestSuite.scala:196)
[error] 	at org.scalatest.TestSuite.withFixture$(TestSuite.scala:195)
[error] 	at org.scalatest.FlatSpec.withFixture(FlatSpec.scala:1685)
[error] 	at org.scalatest.FlatSpecLike.invokeWithFixture$1(FlatSpecLike.scala:1680)
[error] 	at org.scalatest.FlatSpecLike.$anonfun$runTest$1(FlatSpecLike.scala:1692)
[error] 	at org.scalatest.SuperEngine.runTestImpl(Engine.scala:289)
[error] 	at org.scalatest.FlatSpecLike.runTest(FlatSpecLike.scala:1692)
[error] 	at org.scalatest.FlatSpecLike.runTest$(FlatSpecLike.scala:1674)
[error] 	at org.scalatest.FlatSpec.runTest(FlatSpec.scala:1685)
[error] 	at org.scalatest.FlatSpecLike.$anonfun$runTests$1(FlatSpecLike.scala:1750)
[error] 	at org.scalatest.SuperEngine.$anonfun$runTestsInBranch$1(Engine.scala:396)
[error] 	at scala.collection.immutable.List.foreach(List.scala:389)
[error] 	at org.scalatest.SuperEngine.traverseSubNodes$1(Engine.scala:384)
[error] 	at org.scalatest.SuperEngine.runTestsInBranch(Engine.scala:373)
[error] 	at org.scalatest.SuperEngine.$anonfun$runTestsInBranch$1(Engine.scala:410)
[error] 	at scala.collection.immutable.List.foreach(List.scala:389)
[error] 	at org.scalatest.SuperEngine.traverseSubNodes$1(Engine.scala:384)
[error] 	at org.scalatest.SuperEngine.runTestsInBranch(Engine.scala:379)
[error] 	at org.scalatest.SuperEngine.runTestsImpl(Engine.scala:461)
[error] 	at org.scalatest.FlatSpecLike.runTests(FlatSpecLike.scala:1750)
[error] 	at org.scalatest.FlatSpecLike.runTests$(FlatSpecLike.scala:1749)
[error] 	at org.scalatest.FlatSpec.runTests(FlatSpec.scala:1685)
[error] 	at org.scalatest.Suite.run(Suite.scala:1147)
[error] 	at org.scalatest.Suite.run$(Suite.scala:1129)
[error] 	at org.scalatest.FlatSpec.org$scalatest$FlatSpecLike$$super$run(FlatSpec.scala:1685)
[error] 	at org.scalatest.FlatSpecLike.$anonfun$run$1(FlatSpecLike.scala:1795)
[error] 	at org.scalatest.SuperEngine.runImpl(Engine.scala:521)
[error] 	at org.scalatest.FlatSpecLike.run(FlatSpecLike.scala:1795)
[error] 	at org.scalatest.FlatSpecLike.run$(FlatSpecLike.scala:1793)
[error] 	at org.scalatest.FlatSpec.run(FlatSpec.scala:1685)
[error] 	at org.scalatest.tools.Framework.org$scalatest$tools$Framework$$runSuite(Framework.scala:314)
[error] 	at org.scalatest.tools.Framework$ScalaTestTask.execute(Framework.scala:507)
[error] 	at sbt.TestRunner.runTest$1(TestFramework.scala:106)
[error] 	at sbt.TestRunner.run(TestFramework.scala:117)
[error] 	at sbt.TestFramework$$anon$2$$anonfun$$lessinit$greater$1.$anonfun$apply$1(TestFramework.scala:262)
[error] 	at sbt.TestFramework$.sbt$TestFramework$$withContextLoader(TestFramework.scala:233)
[error] 	at sbt.TestFramework$$anon$2$$anonfun$$lessinit$greater$1.apply(TestFramework.scala:262)
[error] 	at sbt.TestFramework$$anon$2$$anonfun$$lessinit$greater$1.apply(TestFramework.scala:262)
[error] 	at sbt.TestFunction.apply(TestFramework.scala:271)
[error] 	at sbt.Tests$.$anonfun$toTask$1(Tests.scala:281)
[error] 	at sbt.std.Transform$$anon$3.$anonfun$apply$2(System.scala:46)
[error] 	at sbt.std.Transform$$anon$4.work(System.scala:66)
[error] 	at sbt.Execute.$anonfun$submit$2(Execute.scala:262)
[error] 	at sbt.internal.util.ErrorHandling$.wideConvert(ErrorHandling.scala:16)
[error] 	at sbt.Execute.work(Execute.scala:271)
[error] 	at sbt.Execute.$anonfun$submit$1(Execute.scala:262)
[error] 	at sbt.ConcurrentRestrictions$$anon$4.$anonfun$submitValid$1(ConcurrentRestrictions.scala:174)
[error] 	at sbt.CompletionService$$anon$2.call(CompletionService.scala:36)
[error] 	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
[error] 	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
[error] 	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
[error] 	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
[error] 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
[error] 	at java.lang.Thread.run(Thread.java:748)
[error] (Test / executeTests) java.lang.NoClassDefFoundError: Could not initialize class com.crimzie.uni.model.Cat$

[gwang555]

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