Release 0.742 · luau-lang/luau

Ding, dong, 🚪 🔔 , what's that, another Luau release???

Hash TypeId, TypePackId, void* and Constraint* by address by @Pyseph in #3007
Improve UDTF chunk names in error messages by @PhoenixWhitefire in #2434
Remove loadstring from built-in type definitions by @PhoenixWhitefire in #2367
Optimize string.gsub for patterns without special characters by @gemtool in #2988
Fix grouped error calls in control flow analysis by @Companion in #2694
Update copyright year in LICENSE.txt by @Alexanderfem in #2446
Add link to C API in README by @PhoenixWhitefire in #3033
Fix ~nil refinements of blocked types never simplifying by @haziscool in #3027
Fix assertion in IrAssemblyTest for Windows by @skberkeley in #3040

Stop sharing internal error reporters between threads to avoid data races. Fixes #3020.
Implement MLStruct-style unifier rewrite rules. Fixes #3001, #3002.
Cache the absence of type functions for all types involved in InstanceCollector.
Improve scope handling for strict mode type checker. Fixes #2991.
Implement autocomplete for function statements.
Fix bug in fragment autocomplete and union discriminant recommendation.
More end-to-end golden tests.

Mark table as mutable for constant propagation if metamethods are involved.
Correctly remap CALLFB slot instruction targets in expandJumps.
Fix LuauCompileMoveElision when current argument target still needs evaluation.
Fix fuzzer crash where CALLFB Protos were stale.
NCG: Continue applying possible optimizations when ConstPropState hits a limit.
NCG: Fix bug in Proto counter logic.
NCG: Do not mark lazy restore locations as materialized under a conditional spill block.
NCG: Exit sync anti-clobber restores have to be delayed until after the state synchronization is complete.
NCG: Do not let buffer offset scale go down to zero.
NCG: In exit sync, restore registers in rematerializable locations that can be clobbered.

Stop gating coroutine.finally behind a debug flag.
Allow the Luau finalizer function to only be called once.
Resume protected calls started by error continuations in Luau.
Support cancellation in lua_pushfinalizerfunction and fix coroutine.close issues.

Full Changelog: 0.741...0.742

Co-authored-by: Alexander Youngblood ayoungblood@roblox.com
Co-authored-by: Ariel Weiss arielweiss@roblox.com
Co-authored-by: Hunter Goldstein hgoldstein@roblox.com
Co-authored-by: Ilya Rezvov irezvov@roblox.com
Co-authored-by: Thomas Schollenberger tschollenberger@roblox.com
Co-authored-by: Varun Saini vsaini@roblox.com
Co-authored-by: Vighnesh Vijay vvijay@roblox.com
Co-authored-by: Vyacheslav Egorov vegorov@roblox.com

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