docs: private void checkForFailedJavaBean(ExecutableElement rejectedSetter) {
      ImmutableSet<ExecutableElement> allGetters = getterToPropertyName.keySet();
      ImmutableSet<ExecutableElement> prefixedGetters =
          AutoValueProcessor.prefixedGettersIn(allGetters);
      if (prefixedGetters.size() < allGetters.size()
          && prefixedGetters.size() >= allGetters.size() / 2) {
        String note =
            "This might be because you are using the getFoo() convention"
                + " for some but not all methods. These methods don't follow the convention: "
                + difference(allGetters, prefixedGetters);
        errorReporter.reportNote(note, rejectedSetter);
      }
    }