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Hey folks, another week means another Luau release! This one features a number of bug fixes in the New Type Solver including improvements to user-defined type functions and a bunch of work to untangle some of the outstanding issues we've been seeing with constraint solving not completing in real world use. We're also continuing to make progress on crashes and other problems that affect the stability of fragment autocomplete, as we work towards delivering consistent, low-latency autocomplete for any editor environment. ## New Type Solver - Fix a bug in user-defined type functions where `print` would incorrectly insert `\1` a number of times. - Fix a bug where attempting to refine an optional generic with a type test will cause a false positive type error (fixes #1666) - Fix a bug where the `refine` type family would not skip over `*no-refine*` discriminants (partial resolution for #1424) - Fix a constraint solving bug where recursive function calls would consistently produce cyclic constraints leading to incomplete or inaccurate type inference. - Implement `readparent` and `writeparent` for class types in user-defined type functions, replacing the incorrectly included `parent` method. - Add initial groundwork (under a debug flag) for eager free type generalization, moving us towards further improvements to constraint solving incomplete errors. ## Fragment Autocomplete - Ease up some assertions to improve stability of mixed-mode use of the two type solvers (i.e. using Fragment Autocomplete on a type graph originally produced by the old type solver) - Resolve a bug with type compatibility checks causing internal compiler errors in autocomplete. ## Lexer and Parser - Improve the accuracy of the roundtrippable AST parsing mode by correctly placing closing parentheses on type groupings. - Add a getter for `offset` in the Lexer by @aduermael in #1688 - Add a second entry point to the parser to parse an expression, `parseExpr` ## Internal Contributors Co-authored-by: Andy Friesen <afriesen@roblox.com> Co-authored-by: Ariel Weiss <aaronweiss@roblox.com> Co-authored-by: Aviral Goel <agoel@roblox.com> Co-authored-by: Hunter Goldstein <hgoldstein@roblox.com> Co-authored-by: James McNellis <jmcnellis@roblox.com> Co-authored-by: Talha Pathan <tpathan@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> Co-authored-by: Aviral Goel <agoel@roblox.com> Co-authored-by: Vighnesh <vvijay@roblox.com> Co-authored-by: Vyacheslav Egorov <vegorov@roblox.com> |
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