builder > A.scala B.scala
compiling Set(A.scala, B.scala)
Changes: Map()
builder > A.scala
compiling Set(A.scala)
Changes: Map(class A -> List(Changed(Definition(A.y))[method y changed from (i: Int)java.lang.String to (i: Int)java.lang.String flags: implicit <method>]))
invalidate B.scala because inherited method changed [Changed(Definition(A.y))[method y changed from (i: Int)java.lang.String to (i: Int)java.lang.String flags: implicit <method>]]
compiling Set(B.scala)
B.scala:2: error: type mismatch;
 found   : Int(3)
 required: String
  val x: String = 3
                  ^