// This file is part of the Luau programming language and is licensed under MIT License; see LICENSE.txt for details

#include "Luau/FragmentAutocomplete.h"
#include "Fixture.h"
#include "Luau/Ast.h"
#include "Luau/AstQuery.h"
#include "Luau/Autocomplete.h"
#include "Luau/BuiltinDefinitions.h"
#include "Luau/Common.h"
#include "Luau/Frontend.h"
#include "Luau/AutocompleteTypes.h"
#include "Luau/ToString.h"
#include "Luau/Type.h"
#include "ScopedFlags.h"

#include <algorithm>
#include <chrono>
#include <ctime>
#include <iomanip>
#include <iostream>
#include <optional>


using namespace Luau;

LUAU_FASTFLAG(LuauAutocompleteRefactorsForIncrementalAutocomplete)
LUAU_FASTFLAG(LuauIncrementalAutocompleteCommentDetection)
LUAU_FASTINT(LuauParseErrorLimit)
LUAU_FASTFLAG(LuauCloneIncrementalModule)

LUAU_FASTFLAG(LuauIncrementalAutocompleteBugfixes)
LUAU_FASTFLAG(LuauMixedModeDefFinderTraversesTypeOf)
LUAU_FASTFLAG(LuauFreeTypesMustHaveBounds)

LUAU_FASTFLAG(LuauBetterReverseDependencyTracking)
LUAU_FASTFLAG(LuauAutocompleteUsesModuleForTypeCompatibility)
LUAU_FASTFLAG(LuauBetterCursorInCommentDetection)
LUAU_FASTFLAG(LuauAllFreeTypesHaveScopes)
LUAU_FASTFLAG(LuauModuleHoldsAstRoot)
LUAU_FASTFLAG(LuauTrackInteriorFreeTypesOnScope)
LUAU_FASTFLAG(LuauClonedTableAndFunctionTypesMustHaveScopes)
LUAU_FASTFLAG(LuauDisableNewSolverAssertsInMixedMode)
LUAU_FASTFLAG(LuauCloneTypeAliasBindings)
LUAU_FASTFLAG(LuauDoNotClonePersistentBindings)
LUAU_FASTFLAG(LuauCloneReturnTypePack)
LUAU_FASTFLAG(LuauIncrementalAutocompleteDemandBasedCloning)
LUAU_FASTFLAG(LuauUserTypeFunTypecheck)

static std::optional<AutocompleteEntryMap> nullCallback(std::string tag, std::optional<const ClassType*> ptr, std::optional<std::string> contents)
{
    return std::nullopt;
}

static FrontendOptions getOptions()
{
    FrontendOptions options;
    options.retainFullTypeGraphs = true;

    if (!FFlag::LuauSolverV2)
        options.forAutocomplete = true;

    options.runLintChecks = false;

    return options;
}

static ModuleResolver& getModuleResolver(Luau::Frontend& frontend)
{
    return FFlag::LuauSolverV2 ? frontend.moduleResolver : frontend.moduleResolverForAutocomplete;
}

template<class BaseType>
struct FragmentAutocompleteFixtureImpl : BaseType
{
    static_assert(std::is_base_of_v<Fixture, BaseType>, "BaseType must be a descendant of Fixture");

    ScopedFastFlag luauAutocompleteRefactorsForIncrementalAutocomplete{FFlag::LuauAutocompleteRefactorsForIncrementalAutocomplete, true};
    ScopedFastFlag luauIncrementalAutocompleteBugfixes{FFlag::LuauIncrementalAutocompleteBugfixes, true};
    ScopedFastFlag luauFreeTypesMustHaveBounds{FFlag::LuauFreeTypesMustHaveBounds, true};
    ScopedFastFlag luauCloneIncrementalModule{FFlag::LuauCloneIncrementalModule, true};
    ScopedFastFlag luauAllFreeTypesHaveScopes{FFlag::LuauAllFreeTypesHaveScopes, true};
    ScopedFastFlag luauModuleHoldsAstRoot{FFlag::LuauModuleHoldsAstRoot, true};
    ScopedFastFlag luauClonedTableAndFunctionTypesMustHaveScopes{FFlag::LuauClonedTableAndFunctionTypesMustHaveScopes, true};
    ScopedFastFlag luauDisableNewSolverAssertsInMixedMode{FFlag::LuauDisableNewSolverAssertsInMixedMode, true};
    ScopedFastFlag luauCloneTypeAliasBindings{FFlag::LuauCloneTypeAliasBindings, true};
    ScopedFastFlag luauDoNotClonePersistentBindings{FFlag::LuauDoNotClonePersistentBindings, true};
    ScopedFastFlag luauCloneReturnTypePack{FFlag::LuauCloneReturnTypePack, true};
    ScopedFastFlag luauIncrementalAutocompleteDemandBasedCloning{FFlag::LuauIncrementalAutocompleteDemandBasedCloning, true};

    FragmentAutocompleteFixtureImpl()
        : BaseType(true)
    {
    }

    CheckResult checkWithOptions(const std::string& source)
    {
        return this->check(source, getOptions());
    }

    FragmentAutocompleteAncestryResult runAutocompleteVisitor(const std::string& source, const Position& cursorPos)
    {
        ParseResult p = this->tryParse(source); // We don't care about parsing incomplete asts
        REQUIRE(p.root);
        return findAncestryForFragmentParse(p.root, cursorPos);
    }


    std::optional<FragmentParseResult> parseFragment(
        const std::string& document,
        const Position& cursorPos,
        std::optional<Position> fragmentEndPosition = std::nullopt
    )
    {
        ModulePtr module = this->getMainModule(getOptions().forAutocomplete);
        std::string_view srcString = document;
        return Luau::parseFragment(module->root, module->names.get(), srcString, cursorPos, fragmentEndPosition);
    }

    CheckResult checkOldSolver(const std::string& source)
    {
        ScopedFastFlag sff{FFlag::LuauSolverV2, false};
        return this->check(Mode::Strict, source, getOptions());
    }

    FragmentTypeCheckResult checkFragment(
        const std::string& document,
        const Position& cursorPos,
        std::optional<Position> fragmentEndPosition = std::nullopt
    )
    {
        auto [_, result] = Luau::typecheckFragment(this->frontend, "MainModule", cursorPos, getOptions(), document, fragmentEndPosition);
        return result;
    }

    FragmentAutocompleteStatusResult autocompleteFragment(
        const std::string& document,
        Position cursorPos,
        std::optional<Position> fragmentEndPosition = std::nullopt
    )
    {
        ParseOptions parseOptions;
        parseOptions.captureComments = true;
        SourceModule source;
        ParseResult parseResult = Parser::parse(document.c_str(), document.length(), *source.names, *source.allocator, parseOptions);
        FrontendOptions options = getOptions();
        FragmentContext context{document, parseResult, options, fragmentEndPosition};
        return Luau::tryFragmentAutocomplete(this->frontend, "MainModule", cursorPos, context, nullCallback);
    }


    void autocompleteFragmentInBothSolvers(
        const std::string& document,
        const std::string& updated,
        Position cursorPos,
        std::function<void(FragmentAutocompleteStatusResult& result)> assertions,
        std::optional<Position> fragmentEndPosition = std::nullopt
    )
    {
        ScopedFastFlag sff{FFlag::LuauSolverV2, true};
        this->check(document, getOptions());

        FragmentAutocompleteStatusResult result = autocompleteFragment(updated, cursorPos, fragmentEndPosition);
        CHECK(result.status != FragmentAutocompleteStatus::InternalIce);
        assertions(result);

        ScopedFastFlag _{FFlag::LuauSolverV2, false};
        this->check(document, getOptions());

        result = autocompleteFragment(updated, cursorPos, fragmentEndPosition);
        CHECK(result.status != FragmentAutocompleteStatus::InternalIce);
        assertions(result);
    }

    std::pair<FragmentTypeCheckStatus, FragmentTypeCheckResult> typecheckFragmentForModule(
        const ModuleName& module,
        const std::string& document,
        Position cursorPos,
        std::optional<Position> fragmentEndPosition = std::nullopt
    )
    {
        return Luau::typecheckFragment(this->frontend, module, cursorPos, getOptions(), document, fragmentEndPosition);
    }

    FragmentAutocompleteStatusResult autocompleteFragmentForModule(
        const ModuleName& module,
        const std::string& document,
        Position cursorPos,
        std::optional<Position> fragmentEndPosition = std::nullopt
    )
    {
        ParseOptions parseOptions;
        parseOptions.captureComments = true;
        SourceModule source;
        ParseResult parseResult = Parser::parse(document.c_str(), document.length(), *source.names, *source.allocator, parseOptions);
        FrontendOptions options;
        FragmentContext context{document, parseResult, options, fragmentEndPosition};
        return Luau::tryFragmentAutocomplete(this->frontend, module, cursorPos, context, nullCallback);
    }
};

struct FragmentAutocompleteFixture : FragmentAutocompleteFixtureImpl<Fixture>
{
    FragmentAutocompleteFixture()
        : FragmentAutocompleteFixtureImpl<Fixture>()
    {
        addGlobalBinding(frontend.globals, "table", Binding{builtinTypes->anyType});
        addGlobalBinding(frontend.globals, "math", Binding{builtinTypes->anyType});
        addGlobalBinding(frontend.globalsForAutocomplete, "table", Binding{builtinTypes->anyType});
        addGlobalBinding(frontend.globalsForAutocomplete, "math", Binding{builtinTypes->anyType});
    }
};

struct FragmentAutocompleteBuiltinsFixture : FragmentAutocompleteFixtureImpl<BuiltinsFixture>
{
    FragmentAutocompleteBuiltinsFixture()
        : FragmentAutocompleteFixtureImpl<BuiltinsFixture>()
    {
        const std::string fakeVecDecl = R"(
declare class FakeVec
    function dot(self, x: FakeVec) : FakeVec
    zero : FakeVec
end
)";
        // The old solver always performs a strict mode check and populates the module resolver and globals
        // for autocomplete.
        // The new solver just populates the globals and the moduleResolver.
        // Because these tests run in both the old solver and the new solver, and the test suite
        // now picks the module resolver as appropriate in order to better mimic the studio code path,
        // we have to load the definition file into both the 'globals'/'resolver' and the equivalent
        // 'for autocomplete'.
        loadDefinition(fakeVecDecl);
        loadDefinition(fakeVecDecl, /* For Autocomplete Module */ true);

        addGlobalBinding(frontend.globals, "game", Binding{builtinTypes->anyType});
        addGlobalBinding(frontend.globalsForAutocomplete, "game", Binding{builtinTypes->anyType});
    }
};

// NOLINTBEGIN(bugprone-unchecked-optional-access)
TEST_SUITE_BEGIN("FragmentAutocompleteTraversalTests");

TEST_CASE_FIXTURE(FragmentAutocompleteFixture, "just_two_locals")
{
    auto result = runAutocompleteVisitor(
        R"(
local x = 4
local y = 5
)",
        {2, 11}
    );

    CHECK_EQ(3, result.ancestry.size());
    CHECK_EQ(1, result.localStack.size());
    CHECK_EQ(result.localMap.size(), result.localStack.size());
    REQUIRE(result.nearestStatement);

    AstStatLocal* local = result.nearestStatement->as<AstStatLocal>();
    REQUIRE(local);
    CHECK(1 == local->vars.size);
    CHECK_EQ("y", std::string(local->vars.data[0]->name.value));
}

TEST_CASE_FIXTURE(FragmentAutocompleteFixture, "cursor_within_scope_tracks_locals_from_previous_scope")
{
    auto result = runAutocompleteVisitor(
        R"(
local x = 4
local y = 5
if x == 4 then
    local e = y
end
)",
        {4, 15}
    );

    CHECK_EQ(5, result.ancestry.size());
    CHECK_EQ(2, result.localStack.size());
    CHECK_EQ(result.localMap.size(), result.localStack.size());
    REQUIRE(result.nearestStatement);
    CHECK_EQ("y", std::string(result.localStack.back()->name.value));

    AstStatLocal* local = result.nearestStatement->as<AstStatLocal>();
    REQUIRE(local);
    CHECK(1 == local->vars.size);
    CHECK_EQ("e", std::string(local->vars.data[0]->name.value));
}

TEST_CASE_FIXTURE(FragmentAutocompleteFixture, "cursor_that_comes_later_shouldnt_capture_locals_in_unavailable_scope")
{
    auto result = runAutocompleteVisitor(
        R"(
local x = 4
local y = 5
if x == 4 then
    local e = y
end
local z = x + x
if y == 5 then
    local q = x + y + z
end
)",
        {8, 23}
    );

    CHECK_EQ(6, result.ancestry.size());
    CHECK_EQ(3, result.localStack.size());
    CHECK_EQ(result.localMap.size(), result.localStack.size());
    REQUIRE(result.nearestStatement);
    CHECK_EQ("z", std::string(result.localStack.back()->name.value));

    AstStatLocal* local = result.nearestStatement->as<AstStatLocal>();
    REQUIRE(local);
    CHECK(1 == local->vars.size);
    CHECK_EQ("q", std::string(local->vars.data[0]->name.value));
}

TEST_CASE_FIXTURE(FragmentAutocompleteFixture, "nearest_enclosing_statement_can_be_non_local")
{
    auto result = runAutocompleteVisitor(
        R"(
local x = 4
local y = 5
if x == 4 then
)",
        {3, 4}
    );

    CHECK_EQ(4, result.ancestry.size());
    CHECK_EQ(2, result.localStack.size());
    CHECK_EQ(result.localMap.size(), result.localStack.size());
    REQUIRE(result.nearestStatement);
    CHECK_EQ("y", std::string(result.localStack.back()->name.value));

    AstStatIf* ifS = result.nearestStatement->as<AstStatIf>();
    CHECK(ifS != nullptr);
}

TEST_CASE_FIXTURE(FragmentAutocompleteFixture, "local_funcs_show_up_in_local_stack")
{
    auto result = runAutocompleteVisitor(
        R"(
local function foo() return 4 end
local x = foo()
local function bar() return x + foo() end
)",
        {3, 32}
    );

    CHECK_EQ(8, result.ancestry.size());
    CHECK_EQ(3, result.localStack.size());
    CHECK_EQ(result.localMap.size(), result.localStack.size());
    CHECK_EQ("bar", std::string(result.localStack.back()->name.value));
    auto returnSt = result.nearestStatement->as<AstStatReturn>();
    CHECK(returnSt != nullptr);
}

TEST_SUITE_END();


TEST_SUITE_BEGIN("FragmentAutocompleteParserTests");

TEST_CASE_FIXTURE(FragmentAutocompleteFixture, "thrown_parse_error_leads_to_null_root")
{
    checkWithOptions("type A =  ");
    ScopedFastInt sfi{FInt::LuauParseErrorLimit, 1};
    auto fragment = parseFragment("type A = <>function<> more garbage here", Position(0, 39));
    CHECK(fragment == std::nullopt);
}

TEST_CASE_FIXTURE(FragmentAutocompleteFixture, "local_initializer")
{
    ScopedFastFlag sff{FFlag::LuauSolverV2, true};
    checkWithOptions("local a =");
    auto fragment = parseFragment("local a =", Position(0, 10));

    REQUIRE(fragment.has_value());
    CHECK_EQ("local a =", fragment->fragmentToParse);
    CHECK_EQ(Location{Position{0, 0}, 9}, fragment->root->location);
}

TEST_CASE_FIXTURE(FragmentAutocompleteFixture, "statement_in_empty_fragment_is_non_null")
{
    ScopedFastFlag sff{FFlag::LuauSolverV2, true};
    auto res = checkWithOptions(R"(

)");

    LUAU_REQUIRE_NO_ERRORS(res);

    auto fragment = parseFragment(
        R"(

)",
        Position(1, 0)
    );
    REQUIRE(fragment.has_value());
    CHECK_EQ("\n", fragment->fragmentToParse);
    CHECK_EQ(2, fragment->ancestry.size());
    REQUIRE(fragment->root);
    CHECK_EQ(0, fragment->root->body.size);
    auto statBody = fragment->root->as<AstStatBlock>();
    CHECK(statBody != nullptr);
}

TEST_CASE_FIXTURE(FragmentAutocompleteFixture, "can_parse_complete_fragments")
{
    ScopedFastFlag sff{FFlag::LuauSolverV2, true};
    auto res = checkWithOptions(
        R"(
local x = 4
local y = 5
)"
    );

    LUAU_REQUIRE_NO_ERRORS(res);

    auto fragment = parseFragment(
        R"(
local x = 4
local y = 5
local z = x + y
)",
        Position{3, 15}
    );

    REQUIRE(fragment.has_value());

    CHECK_EQ(Location{Position{2, 0}, Position{3, 15}}, fragment->root->location);

    CHECK_EQ("local y = 5\nlocal z = x + y", fragment->fragmentToParse);
    CHECK_EQ(5, fragment->ancestry.size());
    REQUIRE(fragment->root);
    CHECK_EQ(2, fragment->root->body.size);
    auto stat = fragment->root->body.data[1]->as<AstStatLocal>();
    REQUIRE(stat);
    CHECK_EQ(1, stat->vars.size);
    CHECK_EQ(1, stat->values.size);
    CHECK_EQ("z", std::string(stat->vars.data[0]->name.value));

    auto bin = stat->values.data[0]->as<AstExprBinary>();
    REQUIRE(bin);
    CHECK_EQ(AstExprBinary::Op::Add, bin->op);

    auto lhs = bin->left->as<AstExprLocal>();
    auto rhs = bin->right->as<AstExprLocal>();
    REQUIRE(lhs);
    REQUIRE(rhs);
    CHECK_EQ("x", std::string(lhs->local->name.value));
    CHECK_EQ("y", std::string(rhs->local->name.value));
}

TEST_CASE_FIXTURE(FragmentAutocompleteFixture, "can_parse_fragments_in_line")
{
    ScopedFastFlag sff{FFlag::LuauSolverV2, true};
    auto res = checkWithOptions(
        R"(
local x = 4
local y = 5
)"
    );

    LUAU_REQUIRE_NO_ERRORS(res);

    auto fragment = parseFragment(
        R"(
local x = 4
local z = x + y
local y = 5
)",
        Position{2, 15}
    );

    REQUIRE(fragment.has_value());

    CHECK_EQ("local z = x + y", fragment->fragmentToParse);
    CHECK_EQ(5, fragment->ancestry.size());
    REQUIRE(fragment->root);
    CHECK_EQ(Location{Position{2, 0}, Position{2, 15}}, fragment->root->location);
    CHECK_EQ(1, fragment->root->body.size);
    auto stat = fragment->root->body.data[0]->as<AstStatLocal>();
    REQUIRE(stat);
    CHECK_EQ(1, stat->vars.size);
    CHECK_EQ(1, stat->values.size);
    CHECK_EQ("z", std::string(stat->vars.data[0]->name.value));

    auto bin = stat->values.data[0]->as<AstExprBinary>();
    REQUIRE(bin);
    CHECK_EQ(AstExprBinary::Op::Add, bin->op);

    auto lhs = bin->left->as<AstExprLocal>();
    auto rhs = bin->right->as<AstExprGlobal>();
    REQUIRE(lhs);
    REQUIRE(rhs);
    CHECK_EQ("x", std::string(lhs->local->name.value));
    CHECK_EQ("y", std::string(rhs->name.value));
}

TEST_CASE_FIXTURE(FragmentAutocompleteFixture, "can_parse_in_correct_scope")
{
    ScopedFastFlag sff{FFlag::LuauSolverV2, true};
    checkWithOptions(R"(
        local myLocal = 4
        function abc()
             local myInnerLocal = 1

        end
  )");

    auto fragment = parseFragment(
        R"(
        local myLocal = 4
        function abc()
             local myInnerLocal = 1

        end
  )",
        Position{6, 0}
    );

    REQUIRE(fragment.has_value());

    CHECK_EQ("\n  ", fragment->fragmentToParse);
}

TEST_CASE_FIXTURE(FragmentAutocompleteFixture, "can_parse_single_line_fragment_override")
{
    ScopedFastFlag sff{FFlag::LuauSolverV2, true};
    auto res = checkWithOptions("function abc(foo: string) end");

    LUAU_REQUIRE_NO_ERRORS(res);

    auto callFragment = parseFragment(
        R"(function abc(foo: string) end
abc("foo")
abc("bar")
)",
        Position{1, 6},
        Position{1, 10}
    );

    REQUIRE(callFragment.has_value());

    CHECK_EQ("function abc(foo: string) end\nabc(\"foo\")", callFragment->fragmentToParse);
    CHECK(callFragment->nearestStatement->is<AstStatFunction>());

    CHECK_GE(callFragment->ancestry.size(), 2);

    AstNode* back = callFragment->ancestry.back();
    CHECK(back->is<AstExprConstantString>());
    CHECK_EQ(Position{1, 4}, back->location.begin);
    CHECK_EQ(Position{1, 9}, back->location.end);

    AstNode* parent = callFragment->ancestry.rbegin()[1];
    CHECK(parent->is<AstExprCall>());
    CHECK_EQ(Position{1, 0}, parent->location.begin);
    CHECK_EQ(Position{1, 10}, parent->location.end);


    auto stringFragment = parseFragment(
        R"(function abc(foo: string) end
abc("foo")
abc("bar")
)",
        Position{1, 6},
        Position{1, 9}
    );

    REQUIRE(stringFragment.has_value());

    CHECK_EQ("function abc(foo: string) end\nabc(\"foo\")", stringFragment->fragmentToParse);
    CHECK(stringFragment->nearestStatement->is<AstStatFunction>());

    CHECK_GE(stringFragment->ancestry.size(), 1);

    back = stringFragment->ancestry.back();

    auto asString = back->as<AstExprConstantString>();
    CHECK(asString);

    CHECK_EQ(Position{1, 4}, asString->location.begin);
    CHECK_EQ(Position{1, 9}, asString->location.end);
    CHECK_EQ("foo", std::string{asString->value.data});
    CHECK_EQ(AstExprConstantString::QuotedSimple, asString->quoteStyle);
}

TEST_CASE_FIXTURE(FragmentAutocompleteFixture, "can_parse_multi_line_fragment_override")
{
    ScopedFastFlag sff{FFlag::LuauSolverV2, true};

    auto res = checkWithOptions("function abc(foo: string) end");

    LUAU_REQUIRE_NO_ERRORS(res);

    auto fragment = parseFragment(
        R"(function abc(foo: string) end
abc(
"foo"
)
abc("bar")
)",
        Position{2, 5},
        Position{3, 1}
    );

    REQUIRE(fragment.has_value());

    CHECK_EQ("function abc(foo: string) end\nabc(\n\"foo\"\n)", fragment->fragmentToParse);
    CHECK(fragment->nearestStatement->is<AstStatFunction>());

    CHECK_GE(fragment->ancestry.size(), 2);

    AstNode* back = fragment->ancestry.back();
    CHECK(back->is<AstExprConstantString>());
    CHECK_EQ(Position{2, 0}, back->location.begin);
    CHECK_EQ(Position{2, 5}, back->location.end);

    AstNode* parent = fragment->ancestry.rbegin()[1];
    CHECK(parent->is<AstExprCall>());
    CHECK_EQ(Position{1, 0}, parent->location.begin);
    CHECK_EQ(Position{3, 1}, parent->location.end);
}

TEST_CASE_FIXTURE(FragmentAutocompleteFixture, "respects_frontend_options")
{
    DOES_NOT_PASS_NEW_SOLVER_GUARD();

    std::string source = R"(
local tbl = { abc = 1234}
t
)";
    fileResolver.source["game/A"] = source;

    FrontendOptions opts;
    opts.forAutocomplete = true;

    frontend.check("game/A", opts);
    CHECK_NE(frontend.moduleResolverForAutocomplete.getModule("game/A"), nullptr);
    CHECK_EQ(frontend.moduleResolver.getModule("game/A"), nullptr);
    ParseOptions parseOptions;
    parseOptions.captureComments = true;
    SourceModule sourceMod;
    ParseResult parseResult = Parser::parse(source.c_str(), source.length(), *sourceMod.names, *sourceMod.allocator, parseOptions);
    FragmentContext context{source, parseResult, opts, std::nullopt};

    FragmentAutocompleteStatusResult frag = Luau::tryFragmentAutocomplete(frontend, "game/A", Position{2, 1}, context, nullCallback);
    REQUIRE(frag.result);
    CHECK_EQ("game/A", frag.result->incrementalModule->name);
    CHECK_NE(frontend.moduleResolverForAutocomplete.getModule("game/A"), nullptr);
    CHECK_EQ(frontend.moduleResolver.getModule("game/A"), nullptr);
}

TEST_SUITE_END();
// NOLINTEND(bugprone-unchecked-optional-access)

TEST_SUITE_BEGIN("FragmentAutocompleteTypeCheckerTests");

TEST_CASE_FIXTURE(FragmentAutocompleteFixture, "can_typecheck_simple_fragment")
{
    ScopedFastFlag sff{FFlag::LuauSolverV2, true};
    auto res = checkWithOptions(
        R"(
local x = 4
local y = 5
)"
    );

    LUAU_REQUIRE_NO_ERRORS(res);

    auto fragment = checkFragment(
        R"(
local x = 4
local y = 5
local z = x + y
)",
        Position{3, 15}
    );

    auto opt = linearSearchForBinding(fragment.freshScope.get(), "z");
    REQUIRE(opt);
    CHECK_EQ("number", toString(*opt));
}

TEST_CASE_FIXTURE(FragmentAutocompleteFixture, "can_typecheck_fragment_inserted_inline")
{
    ScopedFastFlag sff{FFlag::LuauSolverV2, true};
    auto res = checkWithOptions(
        R"(
local x = 4
local y = 5
)"
    );

    LUAU_REQUIRE_NO_ERRORS(res);
    auto fragment = checkFragment(
        R"(
local x = 4
local z = x
local y = 5
)",
        Position{2, 11}
    );

    auto correct = linearSearchForBinding(fragment.freshScope.get(), "z");
    REQUIRE(correct);
    CHECK_EQ("number", toString(*correct));
}

TEST_SUITE_END();


TEST_SUITE_BEGIN("MixedModeTests");

TEST_CASE_FIXTURE(FragmentAutocompleteFixture, "mixed_mode_basic_example_append")
{
    ScopedFastFlag sff{FFlag::LuauSolverV2, false};
    auto res = checkOldSolver(
        R"(
local x = 4
local y = 5
)"
    );

    LUAU_REQUIRE_NO_ERRORS(res);

    auto fragment = checkFragment(
        R"(
local x = 4
local y = 5
local z = x + y
)",
        Position{3, 15}
    );

    auto opt = linearSearchForBinding(fragment.freshScope.get(), "z");
    REQUIRE(opt);
    CHECK_EQ("number", toString(*opt));
}

TEST_CASE_FIXTURE(FragmentAutocompleteFixture, "mixed_mode_basic_example_inlined")
{
    ScopedFastFlag sff{FFlag::LuauSolverV2, false};
    auto res = checkOldSolver(
        R"(
local x = 4
local y = 5
)"
    );

    auto fragment = checkFragment(
        R"(
local x = 4
local z = x
local y = 5
)",
        Position{2, 11}
    );

    auto correct = linearSearchForBinding(fragment.freshScope.get(), "z");
    REQUIRE(correct);
    CHECK_EQ("number", toString(*correct));
}

TEST_CASE_FIXTURE(FragmentAutocompleteFixture, "mixed_mode_can_autocomplete_simple_property_access")
{
    ScopedFastFlag sff{FFlag::LuauSolverV2, false};
    auto res = checkOldSolver(
        R"(
local tbl = { abc = 1234}
)"
    );

    LUAU_REQUIRE_NO_ERRORS(res);

    auto fragment = autocompleteFragment(
        R"(
local tbl = { abc = 1234}
tbl. 
)",
        Position{2, 5}
    );
    REQUIRE(fragment.result);
    LUAU_ASSERT(fragment.result->freshScope);

    CHECK_EQ(1, fragment.result->acResults.entryMap.size());
    CHECK(fragment.result->acResults.entryMap.count("abc"));
    CHECK_EQ(AutocompleteContext::Property, fragment.result->acResults.context);
}

TEST_CASE_FIXTURE(FragmentAutocompleteFixture, "typecheck_fragment_handles_stale_module")
{
    ScopedFastFlag sff(FFlag::LuauModuleHoldsAstRoot, false);
    const std::string sourceName = "MainModule";
    fileResolver.source[sourceName] = "local x = 5";

    CheckResult checkResult = frontend.check(sourceName, getOptions());
    LUAU_REQUIRE_NO_ERRORS(checkResult);

    auto [result, _] = typecheckFragmentForModule(sourceName, fileResolver.source[sourceName], Luau::Position(0, 0));
    CHECK_EQ(result, FragmentTypeCheckStatus::Success);

    frontend.markDirty(sourceName);
    frontend.parse(sourceName);

    CHECK_NE(frontend.getSourceModule(sourceName), nullptr);

    auto [result2, __] = typecheckFragmentForModule(sourceName, fileResolver.source[sourceName], Luau::Position(0, 0));
    CHECK_EQ(result2, FragmentTypeCheckStatus::SkipAutocomplete);
}

TEST_CASE_FIXTURE(FragmentAutocompleteBuiltinsFixture, "typecheck_fragment_handles_unusable_module")
{
    const std::string sourceA = "MainModule";
    fileResolver.source[sourceA] = R"(
local Modules = game:GetService('Gui').Modules
local B = require(Modules.B)
return { hello = B }
)";

    const std::string sourceB = "game/Gui/Modules/B";
    fileResolver.source[sourceB] = R"(return {hello = "hello"})";

    CheckResult result = frontend.check(sourceA, getOptions());
    CHECK(!frontend.isDirty(sourceA, getOptions().forAutocomplete));

    std::weak_ptr<Module> weakModule = getModuleResolver(frontend).getModule(sourceB);
    REQUIRE(!weakModule.expired());

    frontend.markDirty(sourceB);
    CHECK(frontend.isDirty(sourceA, getOptions().forAutocomplete));

    frontend.check(sourceB, getOptions());
    CHECK(weakModule.expired());

    auto [status, _] = typecheckFragmentForModule(sourceA, fileResolver.source[sourceA], Luau::Position(0, 0));
    CHECK_EQ(status, FragmentTypeCheckStatus::SkipAutocomplete);

    auto [status2, _2] = typecheckFragmentForModule(sourceB, fileResolver.source[sourceB], Luau::Position(3, 20));
    CHECK_EQ(status2, FragmentTypeCheckStatus::Success);
}

TEST_SUITE_END();

TEST_SUITE_BEGIN("FragmentAutocompleteTests");

TEST_CASE_FIXTURE(FragmentAutocompleteFixture, "multiple_fragment_autocomplete")
{
    ToStringOptions opt;
    opt.exhaustive = true;
    opt.exhaustive = true;
    opt.functionTypeArguments = true;
    opt.maxTableLength = 0;
    opt.maxTypeLength = 0;

    auto checkAndExamine = [&](const std::string& src, const std::string& idName, const std::string& idString)
    {
        checkWithOptions(src);
        auto id = getType(idName, true);
        LUAU_ASSERT(id);
        CHECK_EQ(Luau::toString(*id, opt), idString);
    };

    auto getTypeFromModule = [](ModulePtr module, const std::string& name) -> std::optional<TypeId>
    {
        if (!module->hasModuleScope())
            return std::nullopt;
        return lookupName(module->getModuleScope(), name);
    };

    auto fragmentACAndCheck = [&](const std::string& updated,
                                  const Position& pos,
                                  const std::string& idName,
                                  const std::string& srcIdString,
                                  const std::string& fragIdString)
    {
        FragmentAutocompleteStatusResult frag = autocompleteFragment(updated, pos, std::nullopt);
        REQUIRE(frag.result);
        auto fragId = getTypeFromModule(frag.result->incrementalModule, idName);
        LUAU_ASSERT(fragId);
        CHECK_EQ(Luau::toString(*fragId, opt), fragIdString);

        auto srcId = getType(idName, true);
        LUAU_ASSERT(srcId);
        CHECK_EQ(Luau::toString(*srcId, opt), srcIdString);
    };

    const std::string source = R"(local module = {}
f
return module)";

    const std::string updated1 = R"(local module = {}
function module.a
return module)";

    const std::string updated2 = R"(local module = {}
function module.ab
return module)";

    {
        ScopedFastFlag sff{FFlag::LuauSolverV2, false};
        ScopedFastFlag sff2{FFlag::LuauCloneIncrementalModule, true};
        ScopedFastFlag sff3{FFlag::LuauFreeTypesMustHaveBounds, true};
        checkAndExamine(source, "module", "{  }");
        fragmentACAndCheck(updated1, Position{1, 17}, "module", "{  }", "{ a: (%error-id%: unknown) -> () }");
        fragmentACAndCheck(updated2, Position{1, 18}, "module", "{  }", "{ ab: (%error-id%: unknown) -> () }");
    }
    {
        ScopedFastFlag sff{FFlag::LuauSolverV2, true};
        checkAndExamine(source, "module", "{  }");
        // [TODO] CLI-140762 Fragment autocomplete still doesn't return correct result when LuauSolverV2 is on
        return;
        fragmentACAndCheck(updated1, Position{1, 17}, "module", "{  }", "{ a: (%error-id%: unknown) -> () }");
        fragmentACAndCheck(updated2, Position{1, 18}, "module", "{  }", "{ ab: (%error-id%: unknown) -> () }");
    }
}

TEST_CASE_FIXTURE(FragmentAutocompleteFixture, "can_autocomplete_simple_property_access")
{

    const std::string source = R"(
local tbl = { abc = 1234}
)";
    const std::string updated = R"(
local tbl = { abc = 1234}
tbl. 
)";

    autocompleteFragmentInBothSolvers(
        source,
        updated,
        Position{2, 5},
        [](FragmentAutocompleteStatusResult& fragment)
        {
            REQUIRE(fragment.result);
            auto acResults = fragment.result->acResults;

            CHECK_EQ(1, acResults.entryMap.size());
            CHECK(acResults.entryMap.count("abc"));
            CHECK_EQ(AutocompleteContext::Property, acResults.context);
        }
    );
}

TEST_CASE_FIXTURE(FragmentAutocompleteFixture, "can_autocomplete_nested_property_access")
{
    const std::string source = R"(
local tbl = { abc = { def = 1234, egh = false } }
)";
    const std::string updated = R"(
local tbl = { abc = { def = 1234, egh = false } }
tbl.abc.
)";
    autocompleteFragmentInBothSolvers(
        source,
        updated,
        Position{2, 8},
        [](FragmentAutocompleteStatusResult& fragment)
        {
            REQUIRE(fragment.result);
            LUAU_ASSERT(fragment.result->freshScope);

            CHECK_EQ(2, fragment.result->acResults.entryMap.size());
            CHECK(fragment.result->acResults.entryMap.count("def"));
            CHECK(fragment.result->acResults.entryMap.count("egh"));
            CHECK_EQ(fragment.result->acResults.context, AutocompleteContext::Property);
        }
    );
}

TEST_CASE_FIXTURE(FragmentAutocompleteFixture, "multiple_functions_complex")
{
    const std::string text = R"( local function f1(a1)
    local l1 = 1;"
    g1 = 1;"
end

local function f2(a2)
    local l2 = 1;
    g2 = 1;
end
)";

    autocompleteFragmentInBothSolvers(
        text,
        text,
        Position{0, 0},
        [](FragmentAutocompleteStatusResult& fragment)
        {
            REQUIRE(fragment.result);
            auto strings = fragment.result->acResults.entryMap;
            CHECK(strings.count("f1") == 0);
            CHECK(strings.count("a1") == 0);
            CHECK(strings.count("l1") == 0);
            CHECK(strings.count("g1") != 0);
            CHECK(strings.count("f2") == 0);
            CHECK(strings.count("a2") == 0);
            CHECK(strings.count("l2") == 0);
            CHECK(strings.count("g2") != 0);
        }
    );

    autocompleteFragmentInBothSolvers(
        text,
        text,
        Position{0, 22},
        [](FragmentAutocompleteStatusResult& fragment)
        {
            REQUIRE(fragment.result);
            auto strings = fragment.result->acResults.entryMap;
            CHECK(strings.count("f1") != 0);
            CHECK(strings.count("a1") != 0);
            CHECK(strings.count("l1") == 0);
            CHECK(strings.count("g1") != 0);
            CHECK(strings.count("f2") == 0);
            CHECK(strings.count("a2") == 0);
            CHECK(strings.count("l2") == 0);
            CHECK(strings.count("g2") != 0);
        }
    );

    autocompleteFragmentInBothSolvers(
        text,
        text,
        Position{1, 17},
        [](FragmentAutocompleteStatusResult& fragment)
        {
            REQUIRE(fragment.result);
            auto strings = fragment.result->acResults.entryMap;
            CHECK(strings.count("f1") != 0);
            CHECK(strings.count("a1") != 0);
            CHECK(strings.count("l1") != 0);
            CHECK(strings.count("g1") != 0);
            CHECK(strings.count("f2") == 0);
            CHECK(strings.count("a2") == 0);
            CHECK(strings.count("l2") == 0);
            CHECK(strings.count("g2") != 0);
        }
    );

    autocompleteFragmentInBothSolvers(
        text,
        text,
        Position{2, 11},
        [](FragmentAutocompleteStatusResult& fragment)
        {
            REQUIRE(fragment.result);
            auto strings = fragment.result->acResults.entryMap;
            CHECK(strings.count("f1") != 0);
            CHECK(strings.count("a1") != 0);
            CHECK(strings.count("l1") != 0);
            CHECK(strings.count("g1") != 0);
            CHECK(strings.count("f2") == 0);
            CHECK(strings.count("a2") == 0);
            CHECK(strings.count("l2") == 0);
            CHECK(strings.count("g2") != 0);
        }
    );

    autocompleteFragmentInBothSolvers(
        text,
        text,
        Position{4, 0},
        [](FragmentAutocompleteStatusResult& fragment)
        {
            REQUIRE(fragment.result);
            auto strings = fragment.result->acResults.entryMap;
            CHECK(strings.count("f1") != 0);
            // FIXME: RIDE-11123: This should be zero counts of `a1`.
            CHECK(strings.count("a1") != 0);
            CHECK(strings.count("l1") == 0);
            CHECK(strings.count("g1") != 0);
            CHECK(strings.count("f2") == 0);
            CHECK(strings.count("a2") == 0);
            CHECK(strings.count("l2") == 0);
            CHECK(strings.count("g2") != 0);
        }
    );

    autocompleteFragmentInBothSolvers(
        text,
        text,
        Position{6, 17},
        [](FragmentAutocompleteStatusResult& fragment)
        {
            REQUIRE(fragment.result);
            auto strings = fragment.result->acResults.entryMap;
            CHECK(strings.count("f1") != 0);
            CHECK(strings.count("a1") == 0);
            CHECK(strings.count("l1") == 0);
            CHECK(strings.count("g1") != 0);
            CHECK(strings.count("f2") != 0);
            CHECK(strings.count("a2") != 0);
            CHECK(strings.count("l2") != 0);
            CHECK(strings.count("g2") != 0);
        }
    );

    autocompleteFragmentInBothSolvers(
        text,
        text,
        Position{8, 4},
        [](FragmentAutocompleteStatusResult& fragment)
        {
            REQUIRE(fragment.result);
            auto strings = fragment.result->acResults.entryMap;
            CHECK(strings.count("f1") != 0);
            CHECK(strings.count("a1") == 0);
            CHECK(strings.count("l1") == 0);
            CHECK(strings.count("g1") != 0);
            CHECK(strings.count("f2") != 0);
            // FIXME: RIDE-11123: This should be zero counts of `a2`.
            CHECK(strings.count("a2") != 0);
            CHECK(strings.count("l2") == 0);
            CHECK(strings.count("g2") != 0);
        }
    );
}

TEST_CASE_FIXTURE(FragmentAutocompleteFixture, "inline_autocomplete_picks_the_right_scope")
{
    const std::string source = R"(
type Table = { a: number, b: number }
do
    type Table = { x: string, y: string }
end
)";

    const std::string updated = R"(
type Table = { a: number, b: number }
do
    type Table = { x: string, y: string }
    local a : T
end
)";

    autocompleteFragmentInBothSolvers(
        source,
        updated,
        Position{4, 15},
        [](FragmentAutocompleteStatusResult& fragment)
        {
            REQUIRE(fragment.result);
            LUAU_ASSERT(fragment.result->freshScope);
            REQUIRE(fragment.result->acResults.entryMap.count("Table"));
            REQUIRE(fragment.result->acResults.entryMap["Table"].type);
            const TableType* tv = get<TableType>(follow(*fragment.result->acResults.entryMap["Table"].type));
            REQUIRE(tv);
            CHECK(tv->props.count("x"));
        }
    );
}

TEST_CASE_FIXTURE(FragmentAutocompleteFixture, "nested_recursive_function")
{
    const std::string source = R"(
function foo()
end
)";
    autocompleteFragmentInBothSolvers(
        source,
        source,
        Position{2, 0},
        [](FragmentAutocompleteStatusResult& fragment)
        {
            REQUIRE(fragment.result);
            CHECK(fragment.result->acResults.entryMap.count("foo"));
            CHECK_EQ(AutocompleteContext::Statement, fragment.result->acResults.context);
        }
    );
}

TEST_CASE_FIXTURE(FragmentAutocompleteFixture, "string_literal_with_override")
{
    const std::string source = R"(
function foo(bar: string) end
foo("abc")
)";

    autocompleteFragmentInBothSolvers(
        source,
        source,
        Position{2, 6},
        [](FragmentAutocompleteStatusResult& fragment)
        {
            REQUIRE(fragment.result);
            CHECK(fragment.result->acResults.entryMap.empty());
            CHECK_EQ(AutocompleteContext::String, fragment.result->acResults.context);
        },
        Position{2, 9}
    );
}

TEST_CASE_FIXTURE(FragmentAutocompleteFixture, "empty_program")
{
    autocompleteFragmentInBothSolvers(
        "",
        "",
        Position{0, 1},
        [](FragmentAutocompleteStatusResult& frag)
        {
            REQUIRE(frag.result);
            auto ac = frag.result->acResults;
            CHECK(ac.entryMap.count("table"));
            CHECK(ac.entryMap.count("math"));
            CHECK_EQ(ac.context, AutocompleteContext::Statement);
        }
    );
}

TEST_CASE_FIXTURE(FragmentAutocompleteFixture, "local_initializer")
{
    const std::string source = "local a =";
    autocompleteFragmentInBothSolvers(
        source,
        source,
        Position{0, 9},
        [](FragmentAutocompleteStatusResult& frag)
        {
            REQUIRE(frag.result);
            auto ac = frag.result->acResults;

            CHECK(ac.entryMap.count("table"));
            CHECK(ac.entryMap.count("math"));
            CHECK_EQ(ac.context, AutocompleteContext::Expression);
        }
    );
}

TEST_CASE_FIXTURE(FragmentAutocompleteFixture, "leave_numbers_alone")
{
    const std::string source = "local a = 3.";

    autocompleteFragmentInBothSolvers(
        source,
        source,
        Position{0, 12},
        [](FragmentAutocompleteStatusResult& frag)
        {
            REQUIRE(frag.result);
            auto ac = frag.result->acResults;
            CHECK(ac.entryMap.empty());
            CHECK_EQ(ac.context, AutocompleteContext::Unknown);
        }
    );
}

TEST_CASE_FIXTURE(FragmentAutocompleteFixture, "user_defined_globals")
{
    const std::string source = "local myLocal = 4; ";

    autocompleteFragmentInBothSolvers(
        source,
        source,
        Position{0, 18},
        [](FragmentAutocompleteStatusResult& frag)
        {
            REQUIRE(frag.result);
            auto ac = frag.result->acResults;

            CHECK(ac.entryMap.count("myLocal"));
            CHECK(ac.entryMap.count("table"));
            CHECK(ac.entryMap.count("math"));
            CHECK_EQ(ac.context, AutocompleteContext::Statement);
        }
    );
}

TEST_CASE_FIXTURE(FragmentAutocompleteFixture, "dont_suggest_local_before_its_definition")
{
    const std::string source = R"(
        local myLocal = 4
        function abc()
             local myInnerLocal = 1

        end
    )";

    // autocomplete after abc but before myInnerLocal
    autocompleteFragmentInBothSolvers(
        source,
        source,
        Position{3, 0},
        [](FragmentAutocompleteStatusResult& fragment)
        {
            REQUIRE(fragment.result);
            auto ac = fragment.result->acResults;
            CHECK(ac.entryMap.count("myLocal"));
            LUAU_CHECK_HAS_NO_KEY(ac.entryMap, "myInnerLocal");
        }
    );
    // autocomplete after my inner local
    autocompleteFragmentInBothSolvers(
        source,
        source,
        Position{4, 0},
        [](FragmentAutocompleteStatusResult& fragment)
        {
            REQUIRE(fragment.result);
            auto ac = fragment.result->acResults;
            CHECK(ac.entryMap.count("myLocal"));
            CHECK(ac.entryMap.count("myInnerLocal"));
        }
    );

    // autocomplete after abc, but don't include myInnerLocal(in the hidden scope)
    autocompleteFragmentInBothSolvers(
        source,
        source,
        Position{6, 0},
        [](FragmentAutocompleteStatusResult& fragment)
        {
            REQUIRE(fragment.result);
            auto ac = fragment.result->acResults;
            CHECK(ac.entryMap.count("myLocal"));
            LUAU_CHECK_HAS_NO_KEY(ac.entryMap, "myInnerLocal");
        }
    );
}

TEST_CASE_FIXTURE(FragmentAutocompleteFixture, "nested_recursive_function")
{
    const std::string source = R"(
        local function outer()
            local function inner()
            end
        end
    )";

    autocompleteFragmentInBothSolvers(
        source,
        source,
        Position{3, 0},
        [](FragmentAutocompleteStatusResult& frag)
        {
            REQUIRE(frag.result);
            auto ac = frag.result->acResults;
            CHECK(ac.entryMap.count("inner"));
            CHECK(ac.entryMap.count("outer"));
        }
    );
}

TEST_CASE_FIXTURE(FragmentAutocompleteFixture, "user_defined_local_functions_in_own_definition")
{
    const std::string source = R"(
        local function abc()

        end
    )";
    // Autocomplete inside of abc
    autocompleteFragmentInBothSolvers(
        source,
        source,
        Position{2, 0},
        [](FragmentAutocompleteStatusResult& frag)
        {
            REQUIRE(frag.result);
            auto ac = frag.result->acResults;
            CHECK(ac.entryMap.count("abc"));
            CHECK(ac.entryMap.count("table"));
            CHECK(ac.entryMap.count("math"));
        }
    );
}

TEST_CASE_FIXTURE(FragmentAutocompleteFixture, "global_functions_are_not_scoped_lexically")
{
    const std::string source = R"(
        if true then
            function abc()

            end
        end
      )";
    autocompleteFragmentInBothSolvers(
        source,
        source,
        Position{6, 0},
        [](FragmentAutocompleteStatusResult& frag)
        {
            REQUIRE(frag.result);
            auto ac = frag.result->acResults;
            CHECK(!ac.entryMap.empty());
            CHECK(ac.entryMap.count("abc"));
            CHECK(ac.entryMap.count("table"));
            CHECK(ac.entryMap.count("math"));
        }
    );
}

TEST_CASE_FIXTURE(FragmentAutocompleteFixture, "local_functions_fall_out_of_scope")
{
    const std::string source = R"(
        if true then
            local function abc()

            end
        end
      )";

    autocompleteFragmentInBothSolvers(
        source,
        source,
        Position{6, 0},
        [](FragmentAutocompleteStatusResult& frag)
        {
            REQUIRE(frag.result);
            auto ac = frag.result->acResults;
            CHECK_NE(0, ac.entryMap.size());
            LUAU_CHECK_HAS_NO_KEY(ac.entryMap, "abc");
        }
    );
}

TEST_CASE_FIXTURE(FragmentAutocompleteFixture, "function_parameters")
{
    const std::string source = R"(
        function abc(test)

        end
    )";

    autocompleteFragmentInBothSolvers(
        source,
        source,
        Position{3, 0},
        [](FragmentAutocompleteStatusResult& frag)
        {
            REQUIRE(frag.result);
            auto ac = frag.result->acResults;
            CHECK(ac.entryMap.count("test"));
        }
    );
}

TEST_CASE_FIXTURE(FragmentAutocompleteFixture, "unsealed_table")
{
    const std::string source = R"(
        local tbl = {}
        tbl.prop = 5
        tbl.
    )";

    autocompleteFragmentInBothSolvers(
        source,
        source,
        Position{3, 12},
        [](FragmentAutocompleteStatusResult& frag)
        {
            REQUIRE(frag.result);
            auto ac = frag.result->acResults;
            CHECK_EQ(1, ac.entryMap.size());
            CHECK(ac.entryMap.count("prop"));
            CHECK_EQ(ac.context, AutocompleteContext::Property);
        }
    );
}

TEST_CASE_FIXTURE(FragmentAutocompleteFixture, "unsealed_table_2")
{
    const std::string source = R"(
        local tbl = {}
        local inner = { prop = 5 }
        tbl.inner = inner
        tbl.inner.
    )";

    autocompleteFragmentInBothSolvers(
        source,
        source,
        Position{4, 18},
        [](FragmentAutocompleteStatusResult& frag)
        {
            REQUIRE(frag.result);
            auto ac = frag.result->acResults;
            CHECK_EQ(1, ac.entryMap.size());
            CHECK(ac.entryMap.count("prop"));
            CHECK_EQ(ac.context, AutocompleteContext::Property);
        }
    );
}

TEST_CASE_FIXTURE(FragmentAutocompleteFixture, "cyclic_table")
{
    const std::string source = R"(
        local abc = {}
        local def = { abc = abc }
        abc.def = def
        abc.def.
    )";

    autocompleteFragmentInBothSolvers(
        source,
        source,
        Position{4, 16},
        [](FragmentAutocompleteStatusResult& frag)
        {
            REQUIRE(frag.result);
            auto ac = frag.result->acResults;
            CHECK(ac.entryMap.count("abc"));
            CHECK_EQ(ac.context, AutocompleteContext::Property);
        }
    );
}

TEST_CASE_FIXTURE(FragmentAutocompleteFixture, "table_union")
{
    const std::string source = R"(
        type t1 = { a1 : string, b2 : number }
        type t2 = { b2 : string, c3 : string }
        function func(abc : t1 | t2)

        end
    )";
    const std::string updated = R"(
        type t1 = { a1 : string, b2 : number }
        type t2 = { b2 : string, c3 : string }
        function func(abc : t1 | t2)
            abc.
        end
    )";

    autocompleteFragmentInBothSolvers(
        source,
        updated,
        Position{4, 16},
        [](FragmentAutocompleteStatusResult& frag)
        {
            REQUIRE(frag.result);
            auto ac = frag.result->acResults;
            CHECK_EQ(1, ac.entryMap.size());
            CHECK(ac.entryMap.count("b2"));
            CHECK_EQ(ac.context, AutocompleteContext::Property);
        }
    );
}

TEST_CASE_FIXTURE(FragmentAutocompleteFixture, "table_intersection")
{
    const std::string source = R"(
        type t1 = { a1 : string, b2 : number }
        type t2 = { b2 : number, c3 : string }
        function func(abc : t1 & t2)

        end
    )";
    const std::string updated = R"(
        type t1 = { a1 : string, b2 : number }
        type t2 = { b2 : number, c3 : string }
        function func(abc : t1 & t2)
            abc.
        end
    )";

    autocompleteFragmentInBothSolvers(
        source,
        updated,
        Position{4, 16},
        [](FragmentAutocompleteStatusResult& frag)
        {
            REQUIRE(frag.result);
            auto ac = frag.result->acResults;
            CHECK_EQ(3, ac.entryMap.size());
            CHECK(ac.entryMap.count("a1"));
            CHECK(ac.entryMap.count("b2"));
            CHECK(ac.entryMap.count("c3"));
            CHECK_EQ(ac.context, AutocompleteContext::Property);
        }
    );
}

TEST_CASE_FIXTURE(FragmentAutocompleteFixture, "get_suggestions_for_the_very_start_of_the_script")
{
    const std::string source = R"(

        function aaa() end
    )";

    autocompleteFragmentInBothSolvers(
        source,
        source,
        Position{0, 0},
        [](FragmentAutocompleteStatusResult& frag)
        {
            REQUIRE(frag.result);
            auto ac = frag.result->acResults;
            CHECK(ac.entryMap.count("table"));
            CHECK_EQ(ac.context, AutocompleteContext::Statement);
        }
    );
}

TEST_CASE_FIXTURE(FragmentAutocompleteFixture, "studio_ice_1")
{
    const std::string source = R"(
--Woop
@native
local function test()

end
)";

    const std::string updated = R"(
--Woop
@native
local function test()

end
function a
)";
    autocompleteFragmentInBothSolvers(source, updated, Position{6, 10}, [](FragmentAutocompleteStatusResult& result) {});
}

TEST_CASE_FIXTURE(FragmentAutocompleteFixture, "method_call_inside_function_body")
{
    const std::string source = R"(
        local game = { GetService=function(s) return 'hello' end }

        function a()

        end
    )";

    const std::string updated = R"(
        local game = { GetService=function(s) return 'hello' end }

        function a()
            game:
        end
    )";

    autocompleteFragmentInBothSolvers(
        source,
        updated,
        Position{4, 17},
        [](FragmentAutocompleteStatusResult& frag)
        {
            REQUIRE(frag.result);
            auto ac = frag.result->acResults;
            CHECK_NE(0, ac.entryMap.size());

            LUAU_CHECK_HAS_NO_KEY(ac.entryMap, "math");
            CHECK_EQ(ac.context, AutocompleteContext::Property);
        }
    );
}

TEST_CASE_FIXTURE(FragmentAutocompleteFixture, "tbl_function_parameter")
{
    const std::string source = R"(
--!strict
type Foo = {x : number, y : number}
local function func(abc : Foo)
   abc.
end
)";

    autocompleteFragmentInBothSolvers(
        source,
        source,
        Position{4, 7},
        [](FragmentAutocompleteStatusResult& frag)
        {
            REQUIRE(frag.result);
            CHECK_EQ(2, frag.result->acResults.entryMap.size());
            CHECK(frag.result->acResults.entryMap.count("x"));
            CHECK(frag.result->acResults.entryMap.count("y"));
        }
    );
}

TEST_CASE_FIXTURE(FragmentAutocompleteFixture, "tbl_local_function_parameter")
{
    const std::string source = R"(
--!strict
type Foo = {x : number, y : number}
local function func(abc : Foo)
   abc.
end
)";

    autocompleteFragmentInBothSolvers(
        source,
        source,
        Position{4, 7},
        [](FragmentAutocompleteStatusResult& frag)
        {
            REQUIRE(frag.result);
            CHECK_EQ(2, frag.result->acResults.entryMap.size());
            CHECK(frag.result->acResults.entryMap.count("x"));
            CHECK(frag.result->acResults.entryMap.count("y"));
        }
    );
}

TEST_CASE_FIXTURE(FragmentAutocompleteBuiltinsFixture, "vec3_function_parameter")
{
    const std::string source = R"(
--!strict
local function func(abc : FakeVec)
   abc.
end
)";

    autocompleteFragmentInBothSolvers(
        source,
        source,
        Position{3, 7},
        [](FragmentAutocompleteStatusResult& frag)
        {
            REQUIRE(frag.result);
            CHECK_EQ(2, frag.result->acResults.entryMap.size());
            CHECK(frag.result->acResults.entryMap.count("zero"));
            CHECK(frag.result->acResults.entryMap.count("dot"));
        }
    );
}

TEST_CASE_FIXTURE(FragmentAutocompleteBuiltinsFixture, "vec3_local_function_parameter")
{
    const std::string source = R"(
--!strict
local function func(abc : FakeVec)
   abc.
end
)";

    autocompleteFragmentInBothSolvers(
        source,
        source,
        Position{3, 7},
        [](FragmentAutocompleteStatusResult& frag)
        {
            REQUIRE(frag.result);
            CHECK_EQ(2, frag.result->acResults.entryMap.size());
            CHECK(frag.result->acResults.entryMap.count("zero"));
            CHECK(frag.result->acResults.entryMap.count("dot"));
        }
    );
}

TEST_CASE_FIXTURE(FragmentAutocompleteBuiltinsFixture, "function_parameter_not_recommending_out_of_scope_argument")
{
    const std::string source = R"(
--!strict
local function foo(abd: FakeVec)
end
local function bar(abc : FakeVec)
   a
end
)";

    autocompleteFragmentInBothSolvers(
        source,
        source,
        Position{5, 5},
        [](FragmentAutocompleteStatusResult& frag)
        {
            REQUIRE(frag.result);
            CHECK(frag.result->acResults.entryMap.count("abc"));
            CHECK(!frag.result->acResults.entryMap.count("abd"));
        }
    );
}

TEST_CASE_FIXTURE(FragmentAutocompleteBuiltinsFixture, "bad_range")
{
    const std::string source = R"(
l
)";
    const std::string updated = R"(
local t = 1
t
)";

    autocompleteFragmentInBothSolvers(
        source,
        updated,
        Position{2, 1},
        [](FragmentAutocompleteStatusResult& frag)
        {
            REQUIRE(frag.result);
            auto opt = linearSearchForBinding(frag.result->freshScope, "t");
            REQUIRE(opt);
            CHECK_EQ("number", toString(*opt));
        }
    );
}

TEST_CASE_FIXTURE(FragmentAutocompleteFixture, "do_not_recommend_results_in_multiline_comment")
{
    ScopedFastFlag sff[] = {{FFlag::LuauIncrementalAutocompleteCommentDetection, true}, {FFlag::LuauBetterCursorInCommentDetection, true}};
    std::string source = R"(--[[
)";
    std::string dest = R"(--[[
a
)";


    autocompleteFragmentInBothSolvers(
        source,
        dest,
        Position{1, 1},
        [](FragmentAutocompleteStatusResult& frag)
        {
            CHECK(frag.result == std::nullopt);
        }
    );
}

TEST_CASE_FIXTURE(FragmentAutocompleteFixture, "no_recs_for_comments_simple")
{
    ScopedFastFlag sff[] = {{FFlag::LuauIncrementalAutocompleteCommentDetection, true}, {FFlag::LuauBetterCursorInCommentDetection, true}};
    const std::string source = R"(
-- sel
-- retur
-- fo
-- if
-- end
-- the
)";
    autocompleteFragmentInBothSolvers(
        source,
        source,
        Position{4, 6},
        [](FragmentAutocompleteStatusResult& frag)
        {
            CHECK(frag.result == std::nullopt);
        }
    );
}

TEST_CASE_FIXTURE(FragmentAutocompleteFixture, "no_recs_for_comments_blocks")
{
    const std::string source = R"(
--[[
comment 1
]] local
-- [[ comment 2]]
--
-- sdfsdfsdf
--[[comment 3]]
--[[
foo
bar
baz
]]
)";
    ScopedFastFlag sff{FFlag::LuauBetterCursorInCommentDetection, true};
    autocompleteFragmentInBothSolvers(
        source,
        source,
        Position{3, 0},
        [](FragmentAutocompleteStatusResult& frag)
        {
            CHECK(frag.result == std::nullopt);
        }
    );

    autocompleteFragmentInBothSolvers(
        source,
        source,
        Position{3, 2},
        [](FragmentAutocompleteStatusResult& frag)
        {
            REQUIRE(frag.result);
            CHECK(!frag.result->acResults.entryMap.empty());
        }
    );

    autocompleteFragmentInBothSolvers(
        source,
        source,
        Position{8, 6},
        [](FragmentAutocompleteStatusResult& frag)
        {
            CHECK(frag.result == std::nullopt);
        }
    );

    autocompleteFragmentInBothSolvers(
        source,
        source,
        Position{10, 0},
        [](FragmentAutocompleteStatusResult& frag)
        {
            CHECK(frag.result == std::nullopt);
        }
    );
}

TEST_CASE_FIXTURE(FragmentAutocompleteFixture, "no_recs_for_comments")
{
    ScopedFastFlag sff[] = {{FFlag::LuauIncrementalAutocompleteCommentDetection, true}, {FFlag::LuauBetterCursorInCommentDetection, true}};
    const std::string source = R"(
-- sel
-- retur
-- fo
--[[ sel ]]
local  -- hello
)";
    autocompleteFragmentInBothSolvers(
        source,
        source,
        Position{1, 7},
        [](FragmentAutocompleteStatusResult& frag)
        {
            CHECK(frag.result == std::nullopt);
        }
    );

    autocompleteFragmentInBothSolvers(
        source,
        source,
        Position{2, 9},
        [](FragmentAutocompleteStatusResult& frag)
        {
            CHECK(frag.result == std::nullopt);
        }
    );

    autocompleteFragmentInBothSolvers(
        source,
        source,
        Position{3, 6},
        [](FragmentAutocompleteStatusResult& frag)
        {
            CHECK(frag.result == std::nullopt);
        }
    );

    autocompleteFragmentInBothSolvers(
        source,
        source,
        Position{4, 9},
        [](FragmentAutocompleteStatusResult& frag)
        {
            CHECK(frag.result == std::nullopt);
        }
    );

    autocompleteFragmentInBothSolvers(
        source,
        source,
        Position{5, 6},
        [](FragmentAutocompleteStatusResult& frag)
        {
            REQUIRE(frag.result);
            CHECK(!frag.result->acResults.entryMap.empty());
        }
    );

    autocompleteFragmentInBothSolvers(
        source,
        source,
        Position{5, 14},
        [](FragmentAutocompleteStatusResult& frag)
        {
            CHECK(frag.result == std::nullopt);
        }
    );
}

TEST_CASE_FIXTURE(FragmentAutocompleteFixture, "no_recs_for_comments_in_incremental_fragment")
{
    const std::string source = R"(
local x = 5
if x == 5
)";
    const std::string updated = R"(
local x = 5
if x == 5 then -- a comment
)";
    ScopedFastFlag sff[] = {{FFlag::LuauIncrementalAutocompleteCommentDetection, true}, {FFlag::LuauBetterCursorInCommentDetection, true}};
    autocompleteFragmentInBothSolvers(
        source,
        updated,
        Position{2, 28},
        [](FragmentAutocompleteStatusResult& frag)
        {
            CHECK(frag.result == std::nullopt);
        }
    );
}

TEST_CASE_FIXTURE(FragmentAutocompleteFixture, "fragment_autocomplete_handles_parse_errors")
{

    ScopedFastInt sfi{FInt::LuauParseErrorLimit, 1};
    const std::string source = R"(

)";
    const std::string updated = R"(
type A = <>random non code text here
)";

    autocompleteFragmentInBothSolvers(
        source,
        updated,
        Position{1, 38},
        [](FragmentAutocompleteStatusResult& frag)
        {
            REQUIRE(frag.result);
            CHECK(frag.result->acResults.entryMap.empty());
        }
    );
}

TEST_CASE_FIXTURE(FragmentAutocompleteFixture, "fragment_autocomplete_handles_stale_module")
{
    ScopedFastFlag sff{FFlag::LuauModuleHoldsAstRoot, false};
    const std::string sourceName = "MainModule";
    fileResolver.source[sourceName] = "local x = 5";

    frontend.check(sourceName, getOptions());
    frontend.markDirty(sourceName);
    frontend.parse(sourceName);

    FragmentAutocompleteStatusResult frag = autocompleteFragmentForModule(sourceName, fileResolver.source[sourceName], Luau::Position(0, 0));
    REQUIRE(frag.result);
    CHECK(frag.result->acResults.entryMap.empty());
    CHECK_EQ(frag.result->incrementalModule, nullptr);
}

TEST_CASE_FIXTURE(FragmentAutocompleteBuiltinsFixture, "require_tracing")
{
    fileResolver.source["MainModule/A"] = R"(
return { x = 0 }
    )";

    fileResolver.source["MainModule"] = R"(
local result = require(script.A)
local x = 1 + result.
    )";

    autocompleteFragmentInBothSolvers(
        fileResolver.source["MainModule"],
        fileResolver.source["MainModule"],
        Position{2, 21},
        [](FragmentAutocompleteStatusResult& frag)
        {
            REQUIRE(frag.result);
            CHECK(frag.result->acResults.entryMap.size() == 1);
            CHECK(frag.result->acResults.entryMap.count("x"));
        }
    );
}

TEST_CASE_FIXTURE(FragmentAutocompleteBuiltinsFixture, "fragment_ac_must_traverse_typeof_and_not_ice")
{
    // This test ensures that we traverse typeof expressions for defs that are being referred to in the fragment
    // In this case, we want to ensure we populate the incremental environment with the reference to `m`
    // Without this, we would ice as we will refer to the local `m` before it's declaration
    ScopedFastFlag sff{FFlag::LuauMixedModeDefFinderTraversesTypeOf, true};
    const std::string source = R"(
--!strict
local m = {}
-- and here
function m:m1() end
type nt = typeof(m)

return m
)";
    const std::string updated = R"(
--!strict
local m = {}
-- and here
function m:m1() end
type nt = typeof(m)
l
return m
)";

    autocompleteFragmentInBothSolvers(source, updated, Position{6, 2}, [](FragmentAutocompleteStatusResult& _) {});
}

TEST_CASE_FIXTURE(FragmentAutocompleteBuiltinsFixture, "duped_alias")
{
    const std::string source = R"(
type a = typeof({})

)";
    const std::string dest = R"(
type a = typeof({})
l
)";

    // Re-parsing and typechecking a type alias in the fragment that was defined in the base module will assert in ConstraintGenerator::checkAliases
    // unless we don't clone it This will let the incremental pass re-generate the type binding, and we will expect to see it in the type bindings
    autocompleteFragmentInBothSolvers(
        source,
        dest,
        Position{2, 2},
        [](FragmentAutocompleteStatusResult& frag)
        {
            REQUIRE(frag.result);
            Scope* sc = frag.result->freshScope;
            CHECK(1 == sc->privateTypeBindings.count("a"));
        }
    );
}

TEST_CASE_FIXTURE(FragmentAutocompleteBuiltinsFixture, "mutually_recursive_alias")
{
    const std::string source = R"(
type U = {f : number, g : U}

)";
    const std::string dest = R"(
type U = {f : number, g : V}
type V = {h : number, i : U?}
)";

    // Re-parsing and typechecking a type alias in the fragment that was defined in the base module will assert in ConstraintGenerator::checkAliases
    // unless we don't clone it This will let the incremental pass re-generate the type binding, and we will expect to see it in the type bindings
    autocompleteFragmentInBothSolvers(
        source,
        dest,
        Position{2, 30},
        [](FragmentAutocompleteStatusResult& frag)
        {
            REQUIRE(frag.result->freshScope);
            Scope* scope = frag.result->freshScope;
            CHECK(1 == scope->privateTypeBindings.count("U"));
            CHECK(1 == scope->privateTypeBindings.count("V"));
        }
    );
}

TEST_CASE_FIXTURE(FragmentAutocompleteBuiltinsFixture, "generalization_crash_when_old_solver_freetypes_have_no_bounds_set")
{
    ScopedFastFlag sff{FFlag::LuauFreeTypesMustHaveBounds, true};
    const std::string source = R"(
local UserInputService = game:GetService("UserInputService");

local Camera = workspace.CurrentCamera;

UserInputService.InputBegan:Connect(function(Input)
    if (Input.KeyCode == Enum.KeyCode.One) then
        local Up = Input.Foo
        local Vector = -(Up:Unit)
    end
end)
)";

    const std::string dest = R"(
local UserInputService = game:GetService("UserInputService");

local Camera = workspace.CurrentCamera;

UserInputService.InputBegan:Connect(function(Input)
    if (Input.KeyCode == Enum.KeyCode.One) then
        local Up = Input.Foo
        local Vector = -(Up:Unit())
    end
end)
)";

    autocompleteFragmentInBothSolvers(source, dest, Position{8, 36}, [](FragmentAutocompleteStatusResult& _) {});
}

TEST_CASE_FIXTURE(FragmentAutocompleteFixture, "fragment_autocomplete_ensures_memory_isolation")
{
    ScopedFastFlag sff{FFlag::LuauCloneIncrementalModule, true};
    ToStringOptions opt;
    opt.exhaustive = true;
    opt.exhaustive = true;
    opt.functionTypeArguments = true;
    opt.maxTableLength = 0;
    opt.maxTypeLength = 0;

    auto checkAndExamine = [&](const std::string& src, const std::string& idName, const std::string& idString)
    {
        checkWithOptions(src);
        auto id = getType(idName, true);
        LUAU_ASSERT(id);
        CHECK_EQ(Luau::toString(*id, opt), idString);
    };

    auto getTypeFromModule = [](ModulePtr module, const std::string& name) -> std::optional<TypeId>
    {
        if (!module->hasModuleScope())
            return std::nullopt;
        return lookupName(module->getModuleScope(), name);
    };

    auto fragmentACAndCheck = [&](const std::string& updated, const Position& pos, const std::string& idName)
    {
        FragmentAutocompleteStatusResult frag = autocompleteFragment(updated, pos, std::nullopt);
        REQUIRE(frag.result);
        auto fragId = getTypeFromModule(frag.result->incrementalModule, idName);
        LUAU_ASSERT(fragId);

        auto srcId = getType(idName, true);
        LUAU_ASSERT(srcId);

        CHECK((*fragId)->owningArena != (*srcId)->owningArena);
        CHECK(&(frag.result->incrementalModule->internalTypes) == (*fragId)->owningArena);
    };

    const std::string source = R"(local module = {}
f
return module)";

    const std::string updated1 = R"(local module = {}
function module.a
return module)";

    const std::string updated2 = R"(local module = {}
function module.ab
return module)";

    {
        ScopedFastFlag sff{FFlag::LuauSolverV2, false};
        checkAndExamine(source, "module", "{  }");
        // [TODO] CLI-140762 we shouldn't mutate stale module in autocompleteFragment
        // early return since the following checking will fail, which it shouldn't!
        fragmentACAndCheck(updated1, Position{1, 17}, "module");
        fragmentACAndCheck(updated2, Position{1, 18}, "module");
    }

    {
        ScopedFastFlag sff{FFlag::LuauSolverV2, true};
        checkAndExamine(source, "module", "{  }");
        // [TODO] CLI-140762 we shouldn't mutate stale module in autocompleteFragment
        // early return since the following checking will fail, which it shouldn't!
        fragmentACAndCheck(updated1, Position{1, 17}, "module");
        fragmentACAndCheck(updated2, Position{1, 18}, "module");
    }
}

TEST_CASE_FIXTURE(FragmentAutocompleteFixture, "fragment_autocomplete_shouldnt_crash_on_cross_module_mutation")
{
    ScopedFastFlag sff{FFlag::LuauCloneIncrementalModule, true};
    const std::string source = R"(local module = {}
function module.
return module
)";

    const std::string updated = R"(local module = {}
function module.f
return module
)";

    autocompleteFragmentInBothSolvers(source, updated, Position{1, 18}, [](FragmentAutocompleteStatusResult& result) {});
}

TEST_CASE_FIXTURE(FragmentAutocompleteBuiltinsFixture, "ice_caused_by_mixed_mode_use")
{
    ScopedFastFlag sff{FFlag::LuauAutocompleteUsesModuleForTypeCompatibility, true};
    const std::string source =
        std::string("--[[\n\tPackage link auto-generated by Rotriever\n]]\nlocal PackageIndex = script.Parent._Index\n\nlocal Package = ") +
        "require(PackageIndex[\"ReactOtter\"][\"ReactOtter\"])\n\nexport type Goal = Package.Goal\nexport type SpringOptions " +
        "= Package.SpringOptions\n\n\nreturn Pa";
    autocompleteFragmentInBothSolvers(
        source,
        source,
        Position{11, 9},
        [](FragmentAutocompleteStatusResult& _) {

        }
    );
    autocompleteFragmentInBothSolvers(source, source, Position{11, 9}, [](auto& _) {});
}

TEST_CASE_FIXTURE(FragmentAutocompleteBuiltinsFixture, "free_type_in_old_solver_shouldnt_trigger_not_null_assertion")
{

    const std::string source = R"(--!strict
local foo
local a, z = foo()

local e = foo().x

local f = foo().y

z
)";

    const std::string dest = R"(--!strict
local foo
local a, z = foo()

local e = foo().x

local f = foo().y

z:a
)";

    autocompleteFragmentInBothSolvers(source, dest, Position{8, 3}, [](FragmentAutocompleteStatusResult& _) {});
}

TEST_CASE_FIXTURE(FragmentAutocompleteBuiltinsFixture, "interior_free_types_assertion_caused_by_free_type_inheriting_null_scope_from_table")
{
    ScopedFastFlag sff{FFlag::LuauTrackInteriorFreeTypesOnScope, true};
    const std::string source = R"(--!strict
local foo
local a = foo()

local e = foo().x

local f = foo().y


)";

    const std::string dest = R"(--!strict
local foo
local a = foo()

local e = foo().x

local f = foo().y

z = a.P.E
)";

    autocompleteFragmentInBothSolvers(source, dest, Position{8, 9}, [](FragmentAutocompleteStatusResult& _) {});
}

TEST_CASE_FIXTURE(FragmentAutocompleteBuiltinsFixture, "NotNull_nil_scope_assertion_caused_by_free_type_inheriting_null_scope_from_table")
{
    ScopedFastFlag sff{FFlag::LuauTrackInteriorFreeTypesOnScope, false};
    const std::string source = R"(--!strict
local foo
local a = foo()

local e = foo().x

local f = foo().y


)";

    const std::string dest = R"(--!strict
local foo
local a = foo()

local e = foo().x

local f = foo().y

z = a.P.E
)";

    autocompleteFragmentInBothSolvers(source, dest, Position{8, 9}, [](FragmentAutocompleteStatusResult& _) {});
}

TEST_CASE_FIXTURE(FragmentAutocompleteBuiltinsFixture, "user_defined_type_function_local")
{
    ScopedFastFlag luauUserTypeFunTypecheck{FFlag::LuauUserTypeFunTypecheck, true};

    const std::string source = R"(--!strict
type function foo(x: type): type
    if x.tag == "singleton" then
        local t = x:value()

        return types.unionof(types.singleton(t), types.singleton(nil))
    end

    return types.number
end
)";

    const std::string dest = R"(--!strict
type function foo(x: type): type
    if x.tag == "singleton" then
        local t = x:value()
        x
        return types.unionof(types.singleton(t), types.singleton(nil))
    end

    return types.number
end
)";

    // Only checking in new solver as old solver doesn't handle type functions and constraint solver will ICE
    ScopedFastFlag sff{FFlag::LuauSolverV2, true};
    this->check(source, getOptions());

    FragmentAutocompleteStatusResult result = autocompleteFragment(dest, Position{4, 9}, std::nullopt);
    CHECK(result.status != FragmentAutocompleteStatus::InternalIce);
}

TEST_SUITE_END();
