{pu : Lean.Compiler.LCNF.Purity} →
  {motive : Lean.Compiler.LCNF.Arg pu → Sort u} →
    (t : Lean.Compiler.LCNF.Arg pu) →
      ((fvarId : Lean.FVarId) → motive (Lean.Compiler.LCNF.Arg.fvar fvarId)) →
        (Nat.hasNotBit 2 t.ctorIdx → motive t) → motive t