Issue: lua test compatibility

issues/24-test-lua-compatibility.md

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+# 24 — Test against major Lua projects
+
+**Status:** open
+
+## Problem
+
+Lush modifies the Lua core (parser, lexer, runtime). We need to verify that these changes don't break compatibility with real-world Lua code.
+
+## Projects to test against
+
+### Language compliance (start here)
+
+- **Lua 5.4 test suite** (`testes/`) — the gold standard; tests edge cases of the language spec directly
+- **LuaJIT test suite** — good for catching subtle semantic differences; also runs the official Lua tests
+
+### Embedded / scripting (real-world stress tests)
+
+- **Neovim** — uses Lua extensively for config and plugins; large test suite using `busted`
+- **OpenResty / nginx-lua** (`lua-nginx-module`) — huge `t/` test directory using Test::Nginx
+- **Kong** — API gateway built on OpenResty; thousands of test cases, stresses coroutines, metatables, and C API
+
+### Game engines
+
+- **Minetest (Luanti)** — open source voxel engine, massive Lua modding API with tests
+- **LÖVE (love2d)** — 2D game framework; community test suites
+- **Defold** — game engine with Lua scripting and integration tests
+
+### Lua tooling / frameworks
+
+- **Luacheck** — linter with a large Lua test suite
+- **busted** — BDD test framework with good self-coverage
+- **lua-TestMore** — port of Perl's Test::More to Lua
+
+## Recommended priority
+
+1. `testes/` from official Lua 5.4 source — most authoritative
+2. Neovim's test suite — real-world, large scale
+3. Kong's test suite — stresses coroutines, metatables, and C API
+4. LuaJIT test suite — catches subtle semantic differences
+
+## Goal
+
+Confirm that standard Lua programs run correctly on Lush without modification. Any failures should be triaged as either acceptable (due to intentional syntax changes) or bugs to fix.
+
+## Implementation
+
+Add a new dir to the gitignore.
+Clone/pull a set of projects that use lua and have a test suite.
+Run their tests using our language.