trait MixinWithSymbol {
  self: MotherClass =>
  def symbolFromTrait: Symbol = 'traitSymbol
}

class MotherClass extends MixinWithSymbol {
  val classSymbol = 'classSymbol
}

object SymbolApp extends App {
  val symbol = (new MotherClass).symbolFromTrait
  println(symbol)  // Error!
}

java.lang.IllegalAccessError: tried to access field MotherClass.symbol$1 from class MixinWithSymbol$class
        at MixinWithSymbol$class.symbolFromTrait(MixinWithSymbol.scala:3)
        at MotherClass.symbolFromTrait(SymbolApp.scala:1)
        at SymbolApp$.delayedEndpoint$SymbolApp$1(SymbolApp.scala:6)
        at SymbolApp$delayedInit$body.apply(SymbolApp.scala:5)
        at scala.Function0$class.apply$mcV$sp(Function0.scala:40)
        at scala.runtime.AbstractFunction0.apply$mcV$sp(AbstractFunction0.scala:12)
        at scala.App$$anonfun$main$1.apply(App.scala:76)
        at scala.App$$anonfun$main$1.apply(App.scala:76)
        at scala.collection.immutable.List.foreach(List.scala:381)
        at scala.collection.generic.TraversableForwarder$class.foreach(TraversableForwarder.scala:35)
        at scala.App$class.main(App.scala:76)
        at SymbolApp$.main(SymbolApp.scala:5)
        at SymbolApp.main(SymbolApp.scala)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)