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.e))[method e changed from ()E to ()E flags: implicit <method>]), class E -> List())
invalidate B.scala because inherited method changed [Changed(Definition(A.e))[method e changed from ()E to ()E flags: implicit <method>]]
compiling Set(B.scala)
B.scala:2: error: could not find implicit value for parameter y: E
  val y = x(3)
           ^