{motive : Lean.IR.Expr → Sort u} →
  (t : Lean.IR.Expr) →
    ((x : Lean.IR.VarId) → (ys : Array Lean.IR.Arg) → motive (Lean.IR.Expr.ap x ys)) →
      (Nat.hasNotBit 256 t.ctorIdx → motive t) → motive t