(motive : Lean.Expr → Sort u_1) →
  (x : Lean.Expr) →
    ((id : Lean.FVarId) → motive (Lean.Expr.fvar id)) →
      ((name : Lean.Name) → (us : List Lean.Level) → motive (Lean.Expr.const name us)) →
        ((x : Lean.Expr) → motive x) → motive x