Exception in thread "main" java.lang.OutOfMemoryError: GC overhead limit exceeded
  at scala.collection.immutable.List.$colon$colon(List.scala:112)
  at scala.reflect.internal.tpe.TypeConstraints$UndoLog.record(TypeConstraints.scala:44)
  at scala.reflect.internal.Types$TypeVar.addHiBound(Types.scala:2984)
  at scala.reflect.internal.Types$TypeVar.addBound$1(Types.scala:3029)
  at scala.reflect.internal.Types$TypeVar.unifySimple$1(Types.scala:3062)
  at scala.reflect.internal.Types$TypeVar.registerBound(Types.scala:3119)
  at scala.reflect.internal.tpe.TypeComparers$class.secondTry$1(TypeComparers.scala:441)
  at scala.reflect.internal.tpe.TypeComparers$class.firstTry$1(TypeComparers.scala:411)
  at scala.reflect.internal.tpe.TypeComparers$class.isSubType2(TypeComparers.scala:552)
  at scala.reflect.internal.tpe.TypeComparers$class.isSubType1(TypeComparers.scala:320)
  at scala.reflect.internal.tpe.TypeComparers$class.isSubType(TypeComparers.scala:278)
  at scala.reflect.internal.SymbolTable.isSubType(SymbolTable.scala:16)
  at scala.reflect.internal.Types$class.isSubArg$1(Types.scala:4116)
  at scala.reflect.internal.Types$$anonfun$isSubArgs$2.apply(Types.scala:4120)
  at scala.reflect.internal.Types$$anonfun$isSubArgs$2.apply(Types.scala:4120)
  at scala.reflect.internal.util.Collections$class.corresponds3(Collections.scala:24)
  at scala.reflect.internal.SymbolTable.corresponds3(SymbolTable.scala:16)
  at scala.reflect.internal.Types$class.isSubArgs(Types.scala:4120)
  at scala.reflect.internal.SymbolTable.isSubArgs(SymbolTable.scala:16)
  at scala.reflect.internal.tpe.TypeComparers$class.firstTry$1(TypeComparers.scala:402)
  at scala.reflect.internal.tpe.TypeComparers$class.isSubType2(TypeComparers.scala:552)
  at scala.reflect.internal.tpe.TypeComparers$class.isSubType1(TypeComparers.scala:320)
  at scala.reflect.internal.tpe.TypeComparers$class.isSubType(TypeComparers.scala:278)
  at scala.reflect.internal.SymbolTable.isSubType(SymbolTable.scala:16)
  at scala.reflect.internal.tpe.TypeComparers$class.firstTry$1(TypeComparers.scala:406)
  at scala.reflect.internal.tpe.TypeComparers$class.isSubType2(TypeComparers.scala:552)
  at scala.reflect.internal.tpe.TypeComparers$class.isSubType1(TypeComparers.scala:320)
  at scala.reflect.internal.tpe.TypeComparers$class.isSubType(TypeComparers.scala:278)
  at scala.reflect.internal.SymbolTable.isSubType(SymbolTable.scala:16)
  at scala.reflect.internal.tpe.TypeComparers$$anonfun$thirdTry$1$3.apply(TypeComparers.scala:483)
  at scala.reflect.internal.tpe.TypeComparers$$anonfun$thirdTry$1$3.apply(TypeComparers.scala:483)
  at scala.reflect.internal.Types$ExistentialType.withTypeVars(Types.scala:2695)