Invisible forward reference when using default argument with case class

[scabug]

Compiling this code

object Error {
  def f {
    case class X(b: Boolean = false)
    val x = X()
  }
}

with scalac 2.8.1.final yields:

Error.scala:4: error: forward reference extends over definition of value x
    val x = X()
            ^
one error found

This seems similar to ticket #2489, but this has been fixed and the code from that ticket compiles without errors.

Versions

• Scala:

$$ scalac -version
Scala compiler version 2.8.1.final -- Copyright 2002-2010, LAMP/EPFL

• Java:

$$ java -version
java version "1.6.0_20"
Java(TM) SE Runtime Environment (build 1.6.0_20-b02-279-10M3065)
Java HotSpot(TM) 64-Bit Server VM (build 16.3-b01-279, mixed mode)

• Operating system: Mac OS X 10.6.4 Build 10F569

$$ uname -a
Darwin john.doe.com 10.4.0 Darwin Kernel Version 10.4.0: Fri Apr 23 18:28:53 PDT 2010; root:xnu-1504.7.4~1/RELEASE_I386 i386

[scabug]

Imported From: https://issues.scala-lang.org/browse/SI-4036?orig=1
Reporter: Martin Gamwell Dawids (mgd)

[scabug]

@adriaanm said:
this seems to be related to the default getter, as this compiles:

object Error {
  def f {
    case class X(b: Boolean)
    val x = X(true)
  }
}

[scabug]

@lrytz said:
(In e1a0866ce7) close #4036, fix #2489. synthetic members (companion objects, default getters) are emitted next to their correspondant. review by extempore.