Diplomatic and consular intercourse and privileges — Permanent diplomatic envoys — Privileges and immunities of — Diplomatic envoys and their staff — Immunity from civil jurisdiction — Vienna Convention on Diplomatic Relations, 1961 — Article 31 — Waiver of immunity — Lack of ratification by sending State of Convention — Whether preventing application of Article 31 in receiving State — Whether Article 31 part of customary international law — Reciprocity — Exceptions to immunity — Article 31 (1) (a)–(c) — The law of Chile