Scala 2.12.3 -Xcheckinit crash with Lift 3.1.0

[japgolly]

1. Add Lift 3.1.0 libraryDependencies += "net.liftweb" %% "lift-webkit" % "3.1.0"
2. scalacOptions += "-Xcheckinit"
3. Run the following:

  import net.liftweb.common.Full
  import net.liftweb.http.{CometCreationInfo, MessageCometActor}

  final class OhNoes extends MessageCometActor {
    def die() = initCometActor(CometCreationInfo("", Full(""), <br/>, Map.empty, null))
  }

  new OhNoes().die()

With Scala 2.12.2 it runs fine; on 2.12.3 it throws an UninitializedFieldError about Lift's CometActor #564.

Stack trace excerpt:

scala.UninitializedFieldError: Uninitialized field: Example.scala: 4
	at OhNoes.net$liftweb$http$BaseCometActor$$_defaultHtml(Example.scala:4)
	at net.liftweb.http.BaseCometActor.defaultHtml(CometActor.scala:564)
	at net.liftweb.http.BaseCometActor.defaultHtml$(CometActor.scala:564)
	at OhNoes.defaultHtml(Example.scala:4)
	at net.liftweb.http.BaseCometActor.initCometActor(CometActor.scala:609)
	at net.liftweb.http.BaseCometActor.initCometActor$(CometActor.scala:607)
	at OhNoes.initCometActor(Example.scala:4)
	at OhNoes.die(Example.scala:5)

[timothyklim]

And akka too

[farmdawgnation]

Hi there, a friendly Lift committer here.

Please let us know if there's a change we could make to ensure the community build catches this regression. =)

[m4dc4p]

See smaller test case in #10439.

[lrytz]

scala/scala#6024

[SethTisue]

Please let us know if there's a change we could make to ensure the community build catches this regression. =)

see scala/community-build#582

[steinybot]

I'm still seeing the same issue that was reported in akka/akka#23453 with Scala 2.12.4

[SethTisue]

@steinybot please open a new ticket with reproduction details