TraversableLike: error: local definition of $anon escapes

[DarkDimius]

$ dotc ./scala-scala/src/library/scala/collection/TraversableLike.scala
warning: encountered F-bounded higher-kinded type parameters for type CC; assuming they are invariant
warning: encountered F-bounded higher-kinded type parameters for type CC; assuming they are invariant
warning: encountered F-bounded higher-kinded type parameters for type CC; assuming they are invariant
warning: encountered F-bounded higher-kinded type parameters for type CC; assuming they are invariant
./scala-scala/src/library/scala/collection/TraversableLike.scala:666: error: local definition of $anon escapes as part of expression's type scala.collection.TraversableView{A =+ A; Coll =+ Repr; underlying: Repr}
  def view = new TraversableView[A, Repr] {
                 ^
four warnings found
one error found