∀ (k₁ k₂ : ℤ) (c₁ : Lean.Meta.Grind.Arith.Linear.EqCnstr) (c₂ : Lean.Meta.Grind.Arith.Linear.DiseqCnstr),
  sizeOf (Lean.Meta.Grind.Arith.Linear.DiseqCnstrProof.subst k₁ k₂ c₁ c₂) =
    1 + sizeOf k₁ + sizeOf k₂ + sizeOf c₁ + sizeOf c₂