{motive_1 : Lean.Compiler.LCNF.UnreachableBranches.Value → Sort u} →
  (t : Lean.Compiler.LCNF.UnreachableBranches.Value) →
    t.ctorIdx = 3 →
      ((vs : List Lean.Compiler.LCNF.UnreachableBranches.Value) →
          motive_1 (Lean.Compiler.LCNF.UnreachableBranches.Value.choice vs)) →
        motive_1 t