code: public static <A, B, C> Converter<Example<A, C>, Example<B, C>> inputConverter(Converter<A, B> converter) {
      return new ExampleConverter<A, C, B, C>(converter, Converters.<C> identity());
    }
docs: Adapts {@code converter} to apply to the input field of {@code Example}s.
  
  @param converter
  @return