t8217-local-alias-requires-rhs.scala:3: error: only traits and abstract classes can have declared but undefined members
    type A
         ^
t8217-local-alias-requires-rhs.scala:6: error: only traits and abstract classes can have declared but undefined members
    type B
         ^
t8217-local-alias-requires-rhs.scala:14: error: only traits and abstract classes can have declared but undefined members
  def this(a: Any) = { this(); type C }
                                    ^
three errors found