(motive : Lean.Expr → Sort u_1) →
  (x : Lean.Expr) →
    ((x : Lean.Name) → (ty val body : Lean.Expr) → (_nonDep : Bool) → motive (Lean.Expr.letE x ty val body _nonDep)) →
      ((x : Lean.Expr) → motive x) → motive x