scala 的内部类

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class A   {       class B;       def foo(b:A#B){}  //def foo(b:B){} 后面的a1.foo(b2) 就不能通过编译   }     object Main {       def main(args: Array[String]): Unit = {             val a1 = new A;           val b1 = new a1.B;           val a2 = new A;           val b2 = new a2.B;                       a1.foo(b2);       }   }