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# What's Changed?
We've been hard at work fixing bugs in the new type solver and getting
it ready to go!
## Native Codegen
* Specialized Luau Codegen instruction for fetching an import.
As a reminder, an import is an expression like `global.thing` and covers
stuff like libraries without fastcalls `coroutine.resume`) and atomic
extern libraries.
## New Type Solver
* Fix an issue that prevented eager generalization from working properly
with OO styled code.
* Avoid copying uninitialized memory in Luau attribute parsing
* Improve type inference of unsealed tables.
* This fixes https://github.com/luau-lang/luau/issues/1838
* and https://github.com/luau-lang/luau/issues/1859
* Infer potential singleton string keys in autocomplete when the
expected index type is a union type.
* Avoid creating cyclic types when reducing types of the form `t1 where
t1 = refine<T, t1, Y>`
* The type cloner now does the same thing for the new and old solvers.
* Properly infer polarity (aka variance) for divergent table properties.
(ie tables whose read type and write type are not the same)
* Crash fixes.
---------
Co-authored-by: Hunter Goldstein <hgoldstein@roblox.com>
Co-authored-by: Varun Saini <61795485+vrn-sn@users.noreply.github.com>
Co-authored-by: Alexander Youngblood <ayoungblood@roblox.com>
Co-authored-by: Menarul Alam <malam@roblox.com>
Co-authored-by: Aviral Goel <agoel@roblox.com>
Co-authored-by: Vighnesh <vvijay@roblox.com>
Co-authored-by: Vyacheslav Egorov <vegorov@roblox.com>
Co-authored-by: Ariel Weiss <aaronweiss@roblox.com>
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|---|---|---|
| .. | ||
| Anyification.cpp | ||
| ApplyTypeFunction.cpp | ||
| AstJsonEncoder.cpp | ||
| AstQuery.cpp | ||
| Autocomplete.cpp | ||
| AutocompleteCore.cpp | ||
| AutocompleteCore.h | ||
| BuiltinDefinitions.cpp | ||
| Clone.cpp | ||
| Constraint.cpp | ||
| ConstraintGenerator.cpp | ||
| ConstraintSolver.cpp | ||
| DataFlowGraph.cpp | ||
| DcrLogger.cpp | ||
| Def.cpp | ||
| EmbeddedBuiltinDefinitions.cpp | ||
| EqSatSimplification.cpp | ||
| Error.cpp | ||
| ExpectedTypeVisitor.cpp | ||
| FileResolver.cpp | ||
| FragmentAutocomplete.cpp | ||
| Frontend.cpp | ||
| Generalization.cpp | ||
| GlobalTypes.cpp | ||
| InferPolarity.cpp | ||
| Instantiation.cpp | ||
| Instantiation2.cpp | ||
| IostreamHelpers.cpp | ||
| JsonEmitter.cpp | ||
| Linter.cpp | ||
| LValue.cpp | ||
| Module.cpp | ||
| NonStrictTypeChecker.cpp | ||
| Normalize.cpp | ||
| OverloadResolution.cpp | ||
| Quantify.cpp | ||
| Refinement.cpp | ||
| RequireTracer.cpp | ||
| Scope.cpp | ||
| Simplify.cpp | ||
| Substitution.cpp | ||
| Subtyping.cpp | ||
| Symbol.cpp | ||
| TableLiteralInference.cpp | ||
| ToDot.cpp | ||
| TopoSortStatements.cpp | ||
| ToString.cpp | ||
| Transpiler.cpp | ||
| TxnLog.cpp | ||
| Type.cpp | ||
| TypeArena.cpp | ||
| TypeAttach.cpp | ||
| TypeChecker2.cpp | ||
| TypedAllocator.cpp | ||
| TypeFunction.cpp | ||
| TypeFunctionReductionGuesser.cpp | ||
| TypeFunctionRuntime.cpp | ||
| TypeFunctionRuntimeBuilder.cpp | ||
| TypeIds.cpp | ||
| TypeInfer.cpp | ||
| TypeOrPack.cpp | ||
| TypePack.cpp | ||
| TypePath.cpp | ||
| TypeUtils.cpp | ||
| Unifiable.cpp | ||
| Unifier.cpp | ||
| Unifier2.cpp | ||