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# What's Changed? This week comes with many improvements to the new type solver and an important fix to the garbage collection to make it more robust in memory constrained scenarios. # Runtime - Garbage collection will no longer run out of memory itself, which could have happened when resizing arrays to a smaller size # New Type Solver - Type refinements on external types should now work and should no longer normalize the type into `never` - Improved error reporting when `string.format` is used with a dynamic format string - Updated type signature of `getmetatable` library function to use the corresponding type function and produce better type inference - Restored a type mismatch error when converting function types with different number of generic parameters, like `() -> ()` into `<T>() -> ()` - Types resulting from compound assignments have been simplified, reducing cyclic type introduction and inference failures - Fixed function generic types leaking into tables during bidirectional type inference (Fixes #1808 and #1821 ) - Stability and performance improvements (Fixes #1860 ) # Internal Contributors Co-authored-by: Andy Friesen <afriesen@roblox.com> Co-authored-by: Ariel Weiss <aaronweiss@roblox.com> Co-authored-by: Hunter Goldstein <hgoldstein@roblox.com> Co-authored-by: Sora Kanosue <skanosue@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>
51 lines
1.4 KiB
C++
51 lines
1.4 KiB
C++
// This file is part of the Luau programming language and is licensed under MIT License; see LICENSE.txt for details
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#include "Fixture.h"
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#include "Luau/InferPolarity.h"
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#include "Luau/Polarity.h"
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#include "Luau/Type.h"
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#include "Luau/TypeArena.h"
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using namespace Luau;
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LUAU_FASTFLAG(LuauEagerGeneralization3);
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TEST_SUITE_BEGIN("InferPolarity");
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TEST_CASE_FIXTURE(Fixture, "T where T = { m: <a>(a) -> T }")
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{
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ScopedFastFlag sff{FFlag::LuauEagerGeneralization3, true};
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TypeArena arena;
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ScopePtr globalScope = std::make_shared<Scope>(builtinTypes->anyTypePack);
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TypeId tType = arena.addType(BlockedType{});
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TypeId aType = arena.addType(GenericType{globalScope.get(), "a"});
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TypeId mType = arena.addType(FunctionType{
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TypeLevel{},
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/* generics */ {aType},
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/* genericPacks */ {},
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/* argPack */ arena.addTypePack({aType}),
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/* retPack */ arena.addTypePack({tType})
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});
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emplaceType<TableType>(
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asMutable(tType),
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TableType{
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TableType::Props{{"m", Property::rw(mType)}},
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/* indexer */ std::nullopt,
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TypeLevel{},
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globalScope.get(),
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TableState::Sealed
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}
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);
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inferGenericPolarities(NotNull{&arena}, NotNull{globalScope.get()}, tType);
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const GenericType* aGeneric = get<GenericType>(aType);
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REQUIRE(aGeneric);
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CHECK(aGeneric->polarity == Polarity::Negative);
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}
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TEST_SUITE_END();
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