{motive : Lean.Elab.Tactic.BVDecide.Frontend.Normalize.SharedCoefficients → Sort u} →
  ((common x y : Lean.Elab.Tactic.BVDecide.Frontend.Normalize.CoefficientsMap) →
      motive { common := common, x := x, y := y }) →
    (t : Lean.Elab.Tactic.BVDecide.Frontend.Normalize.SharedCoefficients) → motive t