Bug recognizing for-comprehensions? Follow

This code compiles fine, so it's not a code bug. Here are the details:

abstract class BugDemo {
  import BugDemo._

  def collection: List[Int]
  def buggedfFunction(filter: Filter) = for (filter(elem) <- neighbors) yield elem
}

object BugDemo {
  class Filter(f: (Int) => Option[Int]) {
    def unapply(t: Int): Option[Int] = f(t)
  }
}

I get a "cannot resolve symbol filter". Should I make a formal bug report?