[Custom Descriptors] Fix GTO descriptor optimization #7897
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We were being too aggressive about removing unused descriptors. In particular, we were removing descriptors from subtypes of public types that themselves had descriptors, which caused invalid subtyping when rebuilding the types. Fix the problem by only removing descriptors from a type when we know we can remove the descriptor (if any) from its supertype (if any) as well.
kripken
approved these changes
Sep 11, 2025
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Not as long as users continue using --closed-world and minimizing the number of public types they expose. |
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We were being too aggressive about removing unused descriptors. In
particular, we were removing descriptors from subtypes of public types
that themselves had descriptors, which caused invalid subtyping when
rebuilding the types. Fix the problem by only removing descriptors from
a type when we know we can remove the descriptor (if any) from its
supertype (if any) as well.