{motive : ProofWidgets.Penrose.RpcEncodablePacket✝ → Sort u} →
  (t : ProofWidgets.Penrose.RpcEncodablePacket✝) →
    ((embeds dsl sty sub maxOptSteps : Lean.Json) →
        motive { embeds := embeds, dsl := dsl, sty := sty, sub := sub, maxOptSteps := maxOptSteps }) →
      motive t