File: t836.scala

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scala 2.11.12-6
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abstract class Obj { type S }
class ObjImpl extends Obj { type S = String }

abstract class A {
  type MyObj <: Obj
  type S = MyObj#S

  val any:  Any = 0
  val some: S = any   // compiles => type X is set to scala.Any
}

class B extends A {
  type MyObj = ObjImpl
  val myString:   S = "hello"
  val realString: String = myString   // error: type mismatch
}