LuaJIT 3.0 proposed syntax extensions
摘要
这是一个用于汇总 LuaJIT 3.0 语法扩展讨论的 umbrella issue，后续文档也计划在此基础上逐步整理与合并，并标注各扩展首次出现的版本。作者鼓励围绕设计与语义进行建设性讨论，同时避免对符号选择等 “外观性问题” 的过度争论。语法扩展的目标包括提升开发体验、已有语言中验证过、避免语法歧义、不破坏向后兼容，以及不增加工具链（如 formatter、LSP）的负担。同时明确不会引入 Perl / Ruby / C++ / Rust 式的复杂语法风格，并强调兼容性与一致性的重要性，相关旧议题已被合并关闭。
荐读理由
这是 LuaJIT 3.0 语法扩展的 umbrella issue 提案，明确拒绝 Perl、Ruby、C++、Rust 等复杂语法，但正文只列出 5 条笼统目标（如改善 QOL、兼容、不破坏），无任何可迁移到中文 AI 工程创业项目的直接方法、工具、洞见或市场信号。
原文
This is an umbrella issue for the LuaJIT 3.0 syntax extensions.
The documentation will be evolved and updated in the first comment below. 1
Please feel free to discuss the choice, design and semantics of syntax extensions in this issue. Improvements and clarification requests for the documentation are welcome, too.
As syntax preferences are largely subjective, please ensure feedback remains constructive. If a specific proposal is declined, please respect the decision and move on. In general, I hope we can keep the discussion focused on functionality and avoid prolonged discussions about cosmetic symbol choices for edge-case operators (aka bike-shedding).
Some of the syntactic choices have already been made by others (C, Lua, JavaScript, …) — and I'm definitely not happy with all of them. But there's value in conformity and compatibility.
The goal is to only add syntax extensions that:
Improve developer quality-of-life.
Are proven. In other languages or Lua dialects.
Do not create syntactic ambiguities.
Do not break backwards compatibility.
Do not make life difficult for tool developers (syntax formatters, LSPs).
Just to make this clear: I have no intention to copy the syntactic complexity of Perl, Ruby, C++ or Rust.
The related issues #63 and #1379 have been closed in favor of this issue.
Footnotes
- LuaJIT has accumulated quite a few extensions over the years. Documentation is scattered all over the place. The plan is to write a free-standing, consolidated documentation of the full language. Extensions will be labeled with the version in which they first appeared. The documentation below will be merged there. ↩
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