Problem when accessing symbol from delayed init body

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The following program fails when trying to access 'x. Of course it is incorrect and should generate a NPE, but this is a proof of concept extracted from a larger project:

object Test extends App {
val a: akka.actor.ActorRef = null;
a ! 'x
}

It gives:

(run-main) java.lang.IllegalAccessError: tried to access field Test$.symbol$1 from class Test$delayedInit$body
java.lang.IllegalAccessError: tried to access field Test$.symbol$1 from class Test$delayedInit$body
at Test$delayedInit$body.(test.scala:3)
at Test$.(test.scala:1)
at Test$.(test.scala)
at Test.main(test.scala)
[...]

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Imported From: https://issues.scala-lang.org/browse/SI-5329?orig=1
Reporter: Samuel Tardieu (rfc1149)

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@paulp said:
#5153, #4396.