scala self generic illegal inheritance

Basicaly this is what I am trying to do. A trait that has a member and another trait that inherits that member and initialize it. Then a class that takes a generic type that must be inherited from the first trait and accesses that member

object main extends App{
val z =  new c[b]()
  z.p()
}

trait a{
  val x : String
}

trait b extends a {
  val x = 1
}

class c [A <: a]  {
  self: A =>
  def p(): Unit ={
    print(x)
  }
}

but in the line

val z =  new c[b]()

c[b] is underlined and the compiler complains that

"Illegal inheritance, self-type c[b] does not conform to A"

I want to define multiple traits that inherit from a father trait and then define a class that takes one of the fathers child traits and accesses its values

---

我找到了答案，我只需在创建对象时扩展对象，如下所示：

object main extends App{
val z =  new c[b] with b
  z.p()
}

trait a{
  val x : String
}

trait b extends a {
  val x = "1"
}

class c[A <: a]{
  this: A =>
  def p(): Unit ={
    print(x)
  }
}

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