regression in fields phase

[retronym]

class Context(val v: AnyRef)

trait AbidePlugin {
  val someVal = ""

  val xxx = null.asInstanceOf[Context { val v: someVal.type }] // or lazy val
}

Crashes with:

Exception in thread "main" scala.reflect.internal.Types$TypeError: type mismatch;
 found   : Context{val v(): AbidePlugin.this.someVal.type}
 required: Context{val v(): AbidePlugin.this.someVal.type}