Sync to upstream/release/687 #1954
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Note: Fixed conflicts by hand in: - Analysis/src/ConstraintGenerator.cpp - CodeGen/src/OptimizeConstProp.cpp - VM/src/lmathlib.cpp - tests/Conformance.test.cpp
a03c92095f6 #unflagged CLI-141149 Added lua_clonetable (#97902) d66c43f36aa #flagged CLI-140903: Do not crash on duplicate keys in table literals (#97833) 8a2687f1690 #nonprod Luau: fix a test configuration issue breaking OSS CI. (#97878) 7add6d9dde9 #nojira CI-debugger revert #unflagged CLI-132461 Luau: refactor subtyping to also include the generic mapping it came up with. (#97872) 0c731fd3cc4 #flag-removal Clip `LuauNewSolverVisitErrorExprLvalues` (#96942) 2fe783b9615 #unflagged CLI-132461 Luau: refactor subtyping to also include the generic mapping it came up with. (#97803) 0cc41a0afae #unflagged CLI-141053 Luau buffer readbits/writebits implementation for big endian machines (#97826) ae50bf04f99 #nonprod CLI-140027 Simplify require-by-string path resolution, fix bug when running CLI tools on unprefixed path (#97468) 77004599a6f #flag-removal Cleanup Luau VM and Compiler flags (#97799) 86777e269dd #flag-removal Remove LuauUserTypeFunPrintToError, LuauUserTypeFunNoExtraConstraint, LuauUserTypeFunUpdateAllEnvs, LuauUserTypeFunThreadBuffer and LuauUserTypeFunExportedAndLocal (#97624) 349b133fdc4 #nojira CI-debugger revert #unflagged CLI-132461 Luau: refactor subtyping to also include the generic mapping it came up with. (#97759) 2e820646ffa #flagged CLI-139615: Treat user defined type functions as opaque in eqSatSimplify (#96897) c0845205e37 #flag-removal CLI-140688 Clean up `FFlagLuauIntersectNormalsNeedsToTrackResourceLimits` as `true`. (#97719) 3e07876a043 #flagged CLI-140571: Track interior free table types generated during constraint solving (#97498) 199b558dc36 #unflagged CLI-132461 Luau: refactor subtyping to also include the generic mapping it came up with. (#95646) fd9255f62d3 #nonprod CLI-140762 unittest for fragment ac crash (#97669) e9c710e017f #flag-removal FFlagLuauStoreCommentsForDefinitionFiles (#93359) b184b940d55 CLI-140702 #unflagged Fix most clang-tidy warnings in TypeChecker2 (#97604) 1fc857f1bb3 CLI-140489 #unflagged Fix a potential hash collision bug in StringCache. (#97539) 58f62f900a2 #nonprod Some new unit testing macros for Luau tests. (#97336) ab43a354b25 #flag-removal Remove LuauVectorMetatable and LuauVectorDefinitionsExtra (#97528) c4c28694390 #flagged CLI-140485 Do not retain the Def/RefinementKey arenas when retainFullTypeGraphs is false (#97422)
This test fails due to a bad interaction when `FFlagLuauStoreCSTData` is enabled, whilst `FFlagLexerFixInterpStringStart` is disabled. The OSS test suite, when run with `--fflags=true`, enables all flags starting with a `Luau` prefix, but does not enable any other flag. To resolve this, we explicitly enable both fflags for the failing interpolated string test cases. As a consequence, we technically lose the check that these tests pass when all flags are disabled.
aatxe
approved these changes
Aug 15, 2025
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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.
@deprecatedattribute can now have a custom suggestion for a replacement and a reason message as described in deprecated attribute parameters RFCFor example:
lua_cpcallC 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 errorInstead of
you can simply do
New Type Solver
nevert1 where t1 = refine<t1, _>getting 'stuck'<T>(T, (T) -> T) -> Tto(number, <X>(X) -> X) -> numberInternal 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