luau-lang/luau
1
0
Fork 0
mirror of https://github.com/luau-lang/luau.git synced 2025-05-04 10:33:46 +01:00
Code Issues Projects Releases Packages Wiki Activity

Responding to comments by jhui

Browse source
This commit is contained in:
ajeffrey@roblox.com 2023-07-20 14:45:04 -07:00
parent cf8e94fb71
commit a0f3fcf238
2 changed files with 11 additions and 10 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

BIN
papers/hatra23/hatra23.pdf
View file

Binary file not shown.

21
papers/hatra23/hatra23.tex
View file

@ -62,14 +62,18 @@ type-driven tooling is important for productivity. These needs result in a desig
\item \emph{strict mode}, aimed at professionals, focused on
minimizing false negatives (i.e.~type soundness).
\end{itemize}
For both communities, type-driven tooling is important, so we
provide \emph{infallible type inference}, which infers types
even for ill-typed or syntactically invalid programs.
%% For both communities, type-driven tooling is important, so we
%% provide \emph{infallible type inference}, which infers types
%% even for ill-typed or syntactically invalid programs.
\section{Progress}
There are two unexpected changes to the type system: \emph{semantic subtyping},
and treating gradual typing as \emph{type error suppression}.
In the two years since the position paper, we have been making changes
to the Luau type system to achieve the goals we set out. Most of the
changes were straightforward, but two were large changes in how we
thought about the design of the type system: replacing the existing
syntactic subtyping algorithm by \emph{semantic subtyping}, and
treating gradual typing as \emph{type error suppression}.
Semantic subtyping
interprets types as sets of values, and subtyping as set
@ -103,11 +107,8 @@ inference~\cite{PT00:LocalTypeInference}.
Currently, non-strict mode operates in the style of gradual type
systems by inferring $\ANY$ as the type for local variables. This does
not play well with type-directed tooling, for example $\ANY$ cannot
provide autocomplete suggestions.
We hope that, together with error suppression, these changes will
result in a significant improvement to type inference and type error
reporting in non-strict mode.
provide autocomplete suggestions. Local type inference will infer more
precise union types, and hence better type-driven tooling.
\bibliographystyle{ACM-Reference-Format} \bibliography{bibliography}