(motive : DoResultPR (List Lean.MVarId) (List Lean.MVarId) PUnit.{1} → Sort u_1) →
  (r : DoResultPR (List Lean.MVarId) (List Lean.MVarId) PUnit.{1}) →
    ((a : List Lean.MVarId) → (u : PUnit.{1}) → motive (DoResultPR.pure a u)) →
      ((b : List Lean.MVarId) → (u : PUnit.{1}) → motive (DoResultPR.return b u)) → motive r