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  • thanks, i extended the original question with new details. Commented Jun 27, 2017 at 12:06
  • read doesn't specify the context bound, which means that innerRead it cannot see it. The context bound must be propagated throughout your calls. However, in order for the implicits to be available at the right moment, you have to import them at call site rather that as you define you method. Commented Jun 27, 2017 at 12:11