message: Use Python3-compliant find
diff: @@ -104,7 +104,7 @@ class Alive2Test(TestFormat):
  return lit.Test.FAIL, out + err
  if expect_err is None and xfail is None:
  - if exitCode == 0 and string.find(out + err, ok_string) != -1:
  + if exitCode == 0 and (out + err).find(ok_string) != -1:
  return lit.Test.PASS, ''
  return lit.Test.FAIL, out + err
  