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    • Robbert Krebbers's avatar
      Special proof mode class for adding a modality to a goal. · a63f256e
      Robbert Krebbers authored
      This used to be done by using `ElimModal` in backwards direction. Having
      a separate type class for this gets rid of some hacks:
      
      - Both `Hint Mode`s in forward and backwards direction for `ElimModal`.
      - Weird type class precedence hacks to make sure the right instance is picked.
        These were needed because using `ElimModal` in backwards direction caused
        ambiguity.
      a63f256e
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