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## What's Changed? This week we have an update with an implementation for one of the RFCs we had approved before, an improvement of the new type solver and a small Lua 5.1 C API compatibility improvement. * `@deprecated` attribute can now have a custom suggestion for a replacement and a reason message as described in [deprecated attribute parameters RFC](https://rfcs.luau.org/syntax-attribute-functions-deprecated.html) For example: ```luau @[deprecated {reason = "foo suffers from performance issues", use = "bar"}] local function foo() ... end -- Function 'foo' is deprecated, use 'bar' instead. foo suffers from performance issues foo() ``` * `lua_cpcall` C API function has been restored both for compatibility with Lua 5.1 and as a safe way to enter protected call environment to work with Luau C API functions that may error Instead of ``` if (!lua_checkstack(L, 2)) return -1; lua_pushcfunction(L, test, nullptr); lua_pushlightuserdata(L, context); int status = lua_pcall(L, 1, 0, 0); ``` you can simply do ``` int status = lua_cpcall(L, test, context); ``` * In Luau CLI, required module return values can now have any type ## New Type Solver - Additional improvements on type refinements used with external types should fix some reported false positive errors where types refined to `never` - Fixed an issue in recursive refinement types in a form of `t1 where t1 = refine<t1, _>` getting 'stuck' - Fixed an issue in subtyping of generic functions, it is now possible to assign `<T>(T, (T) -> T) -> T` to `(number, <X>(X) -> X) -> number` - Fixed an ICE caused by recursive types (Fixes #1686) - Added additional iteration and recursion limits to stop the type solver before system resources are used up ## Internal Contributors Co-authored-by: Andy Friesen <afriesen@roblox.com> Co-authored-by: Annie Tang <annietang@roblox.com> Co-authored-by: Ariel Weiss <aaronweiss@roblox.com> Co-authored-by: Hunter Goldstein <hgoldstein@roblox.com> Co-authored-by: Ilya Rezvov <irezvov@roblox.com> Co-authored-by: Sora Kanosue <skanosue@roblox.com> Co-authored-by: Vighnesh Vijay <vvijay@roblox.com> Co-authored-by: Vyacheslav Egorov <vegorov@roblox.com> |
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