chore: merge from origin/master #874
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Stevengre
commented
Dec 1, 2025
Stevengre
commented
- Allow field(0) projection as a no-op when target value is a PtrLocal #871
…871) The change in #811 allows pointer casts between pointers to data and pointers to "transparent wrapper structs" containing one field with the same data. While the code tries to insert `field(0, _)` projections when casting, this remediation falls short when the cast pointer is of a second degree, i.e., a pointer to a pointer. An example of this can be observed in `Iterator<_>::next`, where a pointer `**T` is cast to a pointer `*NonNull<T>`, `NonNull` being one of these "transparent wrapper structs". The proposed code change allows for a `field(0, _)` projection to be treated as a No-Op when applied to a non-aggregate (nor union), specifically a `PtrLocal` for the case of `next()`. This fixes `iter.next()` for cases where `Some(element)` is returned. The case where it returns `None` is a separate issue tested but not fixed here.
dkcumming
approved these changes
Dec 1, 2025
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