message: The stop-on-exec feature was reverted from github, xfail the test.
diff: @@ -37,6 +37,7 @@ class ExecTestCase(TestBase):
  @skipUnlessDarwin
  @expectedFailureAll(archs=['i386'], bugnumber="rdar://28656532")
  @expectedFailureAll(oslist=["ios", "tvos", "watchos", "bridgeos"], bugnumber="rdar://problem/34559552") # this exec test has problems on ios systems
  + @expectedFailureAll(bugnumber="rdar://problem/35842137")
  def test_skipping_exec (self):
  self.do_test(True)
  