structural.scala:3: error: illegal dependent method type
  def f(x: { type D; def m: D }) = x.m
        ^
structural.scala:10: error: Parameter type in structural refinement may not refer to abstract type defined outside that same refinement
    def f1[C <: AnyRef](x: AnyRef{ type D <: AnyRef; def m[E >: Null <: AnyRef](x: A): AnyRef; val x: A }) = x.m[Tata](x.x) //fail
                                                                                   ^
structural.scala:11: error: Parameter type in structural refinement may not refer to abstract type defined outside that same refinement
    def f2[C <: AnyRef](x: AnyRef{ type D <: AnyRef; def m[E >: Null <: AnyRef](x: B): AnyRef; val x: B }) = x.m[Tata](x.x) //fail
                                                                                   ^
structural.scala:12: error: Parameter type in structural refinement may not refer to abstract type defined outside that same refinement
    def f3[C <: AnyRef](x: AnyRef{ type D <: AnyRef; def m[E >: Null <: AnyRef](x: C): AnyRef; val x: C }) = x.m[Tata](x.x) //fail
                                                                                   ^
structural.scala:19: error: illegal dependent method type
    def f9[C <: AnyRef](x: AnyRef{ type D <: AnyRef; def m[E >: Null <: AnyRef](x: AnyRef): D }) = x.m[Tata](()) //suceed
                        ^
structural.scala:42: error: Parameter type in structural refinement may not refer to abstract type defined outside that same refinement
  type Summable[T] = { def +(v : T) : T }
                                 ^
6 errors found