{motive : Std.Tactic.BVDecide.LRAT.Internal.Assignment → Sort u} →
  (t : Std.Tactic.BVDecide.LRAT.Internal.Assignment) →
    motive Std.Tactic.BVDecide.LRAT.Internal.Assignment.pos →
      motive Std.Tactic.BVDecide.LRAT.Internal.Assignment.neg →
        motive Std.Tactic.BVDecide.LRAT.Internal.Assignment.both →
          motive Std.Tactic.BVDecide.LRAT.Internal.Assignment.unassigned → motive t