0.746

A new release for Luau is ready and brings in the while local statement form support and a tag guided runtime native recompilation, among other smaller fixes and improvements!

while local allows you to create a binding right inside the while statement condition:

while local x = fetch() do
    ...
end

Analysis

• Fixed a case of equality constraint producing unnecessary type cycles
• Added auto-complete suggestions for local and const after if, elseif and while
• Globals that are read and never assigned no longer leak a blocked type
• Globals used inside type functions no longer have effect on type inference outside them and report a typechecking error
• Report type error when iterating over type containing tables that is not itself a subtype of table by @5-erin in #3090

Runtime

• Added hash salting for interning string table when lua_setpointerencodekey is called to avoid crafted string sets from slowing down string operations
• Fixed a crash that could happen in luau_load if embedder exposes GC controls to Luau code
• Functions calling require directly are no longer considered for runtime inlining because that can change require path resolution

Native Code Generation

• Runtime recompilation now gathers information on tags and userdata types to specialize the code in arithmetic, field access and namecalls
• Inlining of memory operands into instructions on x64 is now performed only if there are no conflicting writes

Classes (experimental)

Ongoing work on Classes RFC prototype:

• Fixed a crash when class was extending a different class with the same name, it now correctly refers to the outer class instead of the one being defined
• An error is now reported when a class inherits a constructor instead of defining its own

(required flags: DebugLuauUserDefinedClasses=true,DebugLuauUserDefinedClassesRuntime=true)

Full Changelog: 0.745...0.746