{motive_1 : Lean.Compiler.LCNF.UnreachableBranches.Value → Sort u} →
  (t : Lean.Compiler.LCNF.UnreachableBranches.Value) →
    t.ctorIdx = 0 → motive_1 Lean.Compiler.LCNF.UnreachableBranches.Value.bot → motive_1 t