Spurious Error with early initializer lists 关注

I get a spurious squiggly with early initializers with (The companion object one works fine now though, great work!)
Idea9IC 93.13 & scala plugin 0.3.312

  trait Foo {
    val x : Int
  }
  class Bar extends {
    override val x = 5
  } with Foo

The override is underlined in a red squiggly.