t3934.scala:15: error: method f2 in class J cannot be accessed in test.J
 Access to protected method f2 not permitted because
 enclosing class S1 in package nest is not a subclass of
 class J in package test where target is defined
  def g2(x: J) = x.f2()
                   ^
t3934.scala:20: error: method f2 in class J cannot be accessed in test.J
 Access to protected method f2 not permitted because
 prefix type test.J does not conform to
 class S2 in package nest where the access take place
  def g2(x: J) = x.f2()
                   ^
two errors found