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# General This release introduces initial work on a Roundtrippable AST for Luau, and numerous fixes to the new type solver, runtime, and fragment autocomplete. ## Roundtrippable AST To support tooling around source code transformations, we are extending the parser to retain source information so that we can re-emit the initial source code exactly as the author wrote it. We have made numerous changes to the Transpiler, added new AST types such as `AstTypeGroup`, and added source information to AST nodes such as `AstExprInterpString`, `AstExprIfElse`, `AstTypeTable`, `AstTypeReference`, `AstTypeSingletonString`, and `AstTypeTypeof`. ## New Type Solver * Implement `setmetatable` and `getmetatable` type functions. * Fix handling of nested and recursive union type functions to prevent the solver from getting stuck. * Free types in both old and new solver now have an upper and lower bound to resolve mixed mode usage of the solvers in fragment autocomplete. * Fix infinite recursion during normalization of cyclic tables. * Add normalization support for intersections of subclasses with negated superclasses. ## Runtime * Fix compilation error in Luau buffer bit operations for big-endian machines. ## Miscellaneous * Add test and bugfixes to fragment autocomplete. * Fixed `clang-tidy` warnings in `Simplify.cpp`. **Full Changelog**: https://github.com/luau-lang/luau/compare/0.659...0.660 --- Co-authored-by: Ariel Weiss <aaronweiss@roblox.com> Co-authored-by: Hunter Goldstein <hgoldstein@roblox.com> Co-authored-by: Talha Pathan <tpathan@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> --------- 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>
52 lines
1.5 KiB
C++
52 lines
1.5 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 "Luau/Instantiation2.h"
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#include "Fixture.h"
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#include "ClassFixture.h"
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#include "Luau/Type.h"
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#include "ScopedFlags.h"
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#include "doctest.h"
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using namespace Luau;
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TEST_SUITE_BEGIN("Instantiation2Test");
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TEST_CASE_FIXTURE(Fixture, "weird_cyclic_instantiation")
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{
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TypeArena arena;
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Scope scope(builtinTypes->anyTypePack);
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TypeId genericT = arena.addType(GenericType{"T"});
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TypeId idTy = arena.addType(FunctionType{
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/* generics */ {genericT},
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/* genericPacks */ {},
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/* argTypes */ arena.addTypePack({genericT}),
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/* retTypes */ arena.addTypePack({genericT})
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});
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DenseHashMap<TypeId, TypeId> genericSubstitutions{nullptr};
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DenseHashMap<TypePackId, TypePackId> genericPackSubstitutions{nullptr};
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TypeId freeTy = arena.freshType(builtinTypes, &scope);
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FreeType* ft = getMutable<FreeType>(freeTy);
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REQUIRE(ft);
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ft->lowerBound = idTy;
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ft->upperBound = builtinTypes->unknownType;
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genericSubstitutions[genericT] = freeTy;
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CHECK("<T>(T) -> T" == toString(idTy));
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std::optional<TypeId> res = instantiate2(&arena, std::move(genericSubstitutions), std::move(genericPackSubstitutions), idTy);
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// Substitutions should not mutate the original type!
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CHECK("<T>(T) -> T" == toString(idTy));
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REQUIRE(res);
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CHECK("<T>(T) -> T" == toString(*res));
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}
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TEST_SUITE_END();
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