Early definition with private[this] val crashes scalac

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Sorry in advance if this is disallowed, but the following crashes when the field is object-private:

package eyeshadow

trait A {
  def a: Int
}

object Test {
  def f(a: Int) = new {
    //private val b = a
    private[this] val b = a // crashes, sorry scalac
  } with A {
    def a = b
  }

  def main(args: Array[String]) {
    println(f(7).a)
  }
}

There is a failed assert
at scala.tools.nsc.transform.Constructors$ConstructorTransformer$$anonfun$transformClassTemplate$1.apply(Constructors.scala:160)
or
assert(fields.length == 1)

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Imported From: https://issues.scala-lang.org/browse/SI-6309?orig=1
Reporter: @som-snytt
Affected Versions: 2.10.0-M7

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@som-snytt said:
The sample code does not crash as of 2.11.0-M3.

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@retronym said (edited on May 30, 2013 8:07:38 PM UTC):
Thanks for reporting the progression. We like to hear to hear those now and then.

Test case: scala/scala#2613

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@som-snytt said:
You're welcome. Real gratitude would be an upvote on
http://stackoverflow.com/a/12239654/1296806
Why do my dumb easy answers get upvotes while interesting answers get crickets?

Maybe I make easy stuff sound hard and interesting stuff sound like cricket bait.

It's OK if you don't support the speculative import syntax in the comment. I'd forgotten about that.