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[DO NOT LAND][SLOP] Prototype reified fibers - #9015

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reified-fibers
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[DO NOT LAND][SLOP] Prototype reified fibers#9015
tlively wants to merge 2 commits into
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reified-fibers

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@tlively tlively commented Aug 18, 2026

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One-shot with Gemini, but it seems to work! YOLO!

The custom descriptors proposal previously allowed subtyping that looked like this:

```
A
^
B -> B.desc
```

It was possible for a type to have a descriptor while its supertype did not.

However, we've decided to tighten the validation rules to disallow this pattern. Now `A`` will also need a descriptor, `A.desc`, and `A.desc` will need to be the declared supertype of `B.desc` for this to be valid.

See WebAssembly/custom-descriptors#109.
One-shot with Gemini, but it seems to work! YOLO!
Base automatically changed from no-L-desc-subtyping to main August 21, 2026 18:40
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