[CustomDescriptors] Ensure a non-nullable type for ref.cast_desc_eq on null - #8975
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kripken wants to merge 2 commits into
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[CustomDescriptors] Ensure a non-nullable type for ref.cast_desc_eq on null#8975kripken wants to merge 2 commits into
kripken wants to merge 2 commits into
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If the desc is null, the cast is not even executed, making it unreachable.
We typed it as nullable if the ref was (in the code path
type = ref->type;),but emiting an uninhabitable type is more precise, and also avoids a fuzz
bug (see new test) where refinalize actually un-refined a type: it turned it
from non-nullable to nullable.