Sync to upstream/release/632 (#1307)

# What's Changed?

- Fix #1137 by appropriately retaining additional metadata from
definition files throughout the type system.
- Improve Frontend for LSPs by appropriately allowing the cancellation
of typechecking while running its destructor.

## New Solver

- Added support for the `rawget` type function.
- Reduced overall static memory usage of builtin type functions.
- Fixed a crash where visitors could mutate a union or intersection type
and fail to invalidate iteration over them in doing so.
- Revised autocomplete functionality to not rely on a separate run of
the type solver when using the new solver.
- Implemented a more relaxed semantic rule for casting.
- Fixed some smaller crashes in the new solver.

## Native Code Generation

- Add additional codegen specialization for `math.sign`
- Cleaned up a large number of outstanding fflags in the code.

### Internal Contributors

Co-authored-by: Aaron Weiss <aaronweiss@roblox.com>
Co-authored-by: Alexander McCord <amccord@roblox.com>
Co-authored-by: Andy Friesen <afriesen@roblox.com>
Co-authored-by: James McNellis <jmcnellis@roblox.com>
Co-authored-by: Jeremy Yoo <jyoo@roblox.com>
Co-authored-by: Vighnesh Vijay <vvijay@roblox.com>
Co-authored-by: Vyacheslav Egorov <vegorov@roblox.com>

---------

Co-authored-by: Alexander McCord <amccord@roblox.com>
Co-authored-by: Andy Friesen <afriesen@roblox.com>
Co-authored-by: Vighnesh <vvijay@roblox.com>
Co-authored-by: Aviral Goel <agoel@roblox.com>
Co-authored-by: David Cope <dcope@roblox.com>
Co-authored-by: Lily Brown <lbrown@roblox.com>
Co-authored-by: Vyacheslav Egorov <vegorov@roblox.com>

Author: 8 people

Analysis/include/Luau/Frontend.h

@@ -191,7 +191,7 @@ struct Frontend
     void queueModuleCheck(const std::vector<ModuleName>& names);
     void queueModuleCheck(const ModuleName& name);
     std::vector<ModuleName> checkQueuedModules(std::optional<FrontendOptions> optionOverride = {},
-        std::function<void(std::function<void()> task)> executeTask = {}, std::function<void(size_t done, size_t total)> progress = {});
+        std::function<void(std::function<void()> task)> executeTask = {}, std::function<bool(size_t done, size_t total)> progress = {});
 
     std::optional<CheckResult> getCheckResult(const ModuleName& name, bool accumulateNested, bool forAutocomplete = false);
 

Analysis/include/Luau/TypeFamily.h

@@ -180,12 +180,11 @@ struct BuiltinTypeFamilies
     TypeFamily rawkeyofFamily;
 
     TypeFamily indexFamily;
+    TypeFamily rawgetFamily;
 
     void addToScope(NotNull<TypeArena> arena, NotNull<Scope> scope) const;
 };
 
-
-
-const BuiltinTypeFamilies kBuiltinTypeFamilies{};
+const BuiltinTypeFamilies& builtinTypeFunctions();
 
 } // namespace Luau

Analysis/include/Luau/VisitType.h

@@ -348,16 +348,38 @@ struct GenericTypeVisitor
         {
             if (visit(ty, *utv))
             {
+                bool unionChanged = false;
                 for (TypeId optTy : utv->options)
+                {
                     traverse(optTy);
+                    if (!get<UnionType>(follow(ty)))
+                    {
+                        unionChanged = true;
+                        break;
+                    }
+                }
+
+                if (unionChanged)
+                    traverse(ty);
             }
         }
         else if (auto itv = get<IntersectionType>(ty))
         {
             if (visit(ty, *itv))
             {
+                bool intersectionChanged = false;
                 for (TypeId partTy : itv->parts)
+                {
                     traverse(partTy);
+                    if (!get<IntersectionType>(follow(ty)))
+                    {
+                        intersectionChanged = true;
+                        break;
+                    }
+                }
+
+                if (intersectionChanged)
+                    traverse(ty);
             }
         }
         else if (auto ltv = get<LazyType>(ty))

Analysis/src/AstJsonEncoder.cpp

@@ -8,6 +8,8 @@
 
 #include <math.h>
 
+LUAU_FASTFLAG(LuauDeclarationExtraPropData)
+
 namespace Luau
 {
 
@@ -735,8 +737,21 @@ struct AstJsonEncoder : public AstVisitor
     void write(class AstStatDeclareFunction* node)
     {
         writeNode(node, "AstStatDeclareFunction", [&]() {
+            // TODO: attributes
             PROP(name);
+
+            if (FFlag::LuauDeclarationExtraPropData)
+                PROP(nameLocation);
+
             PROP(params);
+
+            if (FFlag::LuauDeclarationExtraPropData)
+            {
+                PROP(paramNames);
+                PROP(vararg);
+                PROP(varargLocation);
+            }
+
             PROP(retTypes);
             PROP(generics);
             PROP(genericPacks);
@@ -747,6 +762,10 @@ struct AstJsonEncoder : public AstVisitor
     {
         writeNode(node, "AstStatDeclareGlobal", [&]() {
             PROP(name);
+
+            if (FFlag::LuauDeclarationExtraPropData)
+                PROP(nameLocation);
+
             PROP(type);
         });
     }
@@ -756,8 +775,16 @@ struct AstJsonEncoder : public AstVisitor
         writeRaw("{");
         bool c = pushComma();
         write("name", prop.name);
+
+        if (FFlag::LuauDeclarationExtraPropData)
+            write("nameLocation", prop.nameLocation);
+
         writeType("AstDeclaredClassProp");
         write("luauType", prop.ty);
+
+        if (FFlag::LuauDeclarationExtraPropData)
+            write("location", prop.location);
+
         popComma(c);
         writeRaw("}");
     }

Analysis/src/Autocomplete.cpp

@@ -1830,12 +1830,21 @@ AutocompleteResult autocomplete(Frontend& frontend, const ModuleName& moduleName
     if (!sourceModule)
         return {};
 
-    ModulePtr module = frontend.moduleResolverForAutocomplete.getModule(moduleName);
+    ModulePtr module;
+    if (FFlag::DebugLuauDeferredConstraintResolution)
+        module = frontend.moduleResolver.getModule(moduleName);
+    else
+        module = frontend.moduleResolverForAutocomplete.getModule(moduleName);
+
     if (!module)
         return {};
 
     NotNull<BuiltinTypes> builtinTypes = frontend.builtinTypes;
-    Scope* globalScope = frontend.globalsForAutocomplete.globalScope.get();
+    Scope* globalScope;
+    if (FFlag::DebugLuauDeferredConstraintResolution)
+        globalScope = frontend.globals.globalScope.get();
+    else
+        globalScope = frontend.globalsForAutocomplete.globalScope.get();
 
     TypeArena typeArena;
     return autocomplete(*sourceModule, module, builtinTypes, &typeArena, globalScope, position, callback);

Analysis/src/BuiltinDefinitions.cpp

@@ -216,7 +216,7 @@ void registerBuiltinGlobals(Frontend& frontend, GlobalTypes& globals, bool typeC
     NotNull<BuiltinTypes> builtinTypes = globals.builtinTypes;
 
     if (FFlag::DebugLuauDeferredConstraintResolution)
-        kBuiltinTypeFamilies.addToScope(NotNull{&arena}, NotNull{globals.globalScope.get()});
+        builtinTypeFunctions().addToScope(NotNull{&arena}, NotNull{globals.globalScope.get()});
 
     LoadDefinitionFileResult loadResult = frontend.loadDefinitionFile(
         globals, globals.globalScope, getBuiltinDefinitionSource(), "@luau", /* captureComments */ false, typeCheckForAutocomplete);
@@ -313,7 +313,7 @@ void registerBuiltinGlobals(Frontend& frontend, GlobalTypes& globals, bool typeC
         // declare function assert<T>(value: T, errorMessage: string?): intersect<T, ~(false?)>
         TypeId genericT = arena.addType(GenericType{"T"});
         TypeId refinedTy = arena.addType(TypeFamilyInstanceType{
-            NotNull{&kBuiltinTypeFamilies.intersectFamily}, {genericT, arena.addType(NegationType{builtinTypes->falsyType})}, {}});
+            NotNull{&builtinTypeFunctions().intersectFamily}, {genericT, arena.addType(NegationType{builtinTypes->falsyType})}, {}});
 
         TypeId assertTy = arena.addType(FunctionType{
             {genericT}, {}, arena.addTypePack(TypePack{{genericT, builtinTypes->optionalStringType}}), arena.addTypePack(TypePack{{refinedTy}})});