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b0dadff6de
Include the computed alignment of the violating field when rejecting
transparent types with non-trivially aligned ZSTs.
ZST member fields in transparent types must have an alignment of 1 (to
ensure it does not raise the layout requirements of the transparent
field). The current error message looks like this:
LL | struct Foobar(u32, [u32; 0]);
| ^^^^^^^^ has alignment larger than 1
This patch changes the report to include the alignment of the violating
field:
LL | struct Foobar(u32, [u32; 0]);
| ^^^^^^^^ has alignment of 4, which is larger than 1
In case of unknown alignments, it will yield:
LL | struct Foobar<T>(u32, [T; 0]);
| ^^^^^^ may have alignment larger than 1
This allows developers to get a better grasp why a specific field is
rejected. Knowing the alignment of the violating field makes it easier
to judge where that alignment-requirement originates, and thus hopefully
provide better hints on how to mitigate the problem.
This idea was proposed in 2022 in #98071 as part of a bigger change.
This commit simply extracts this error-message change, to decouple it
from the other diagnostic improvements.
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| .. | ||
| auxiliary | ||
| 16-bit-repr-c-enum.rs | ||
| align-with-extern-c-fn.rs | ||
| aligned_enum_cast.rs | ||
| attr-usage-repr.rs | ||
| attr-usage-repr.stderr | ||
| invalid_repr_list_help.rs | ||
| invalid_repr_list_help.stderr | ||
| issue-83505-repr-simd.rs | ||
| issue-83505-repr-simd.stderr | ||
| issue-83921-ice.rs | ||
| issue-83921-ice.stderr | ||
| repr_c_int_align.rs | ||
| repr-align-assign.fixed | ||
| repr-align-assign.rs | ||
| repr-align-assign.stderr | ||
| repr-align.rs | ||
| repr-align.stderr | ||
| repr-disallow-on-variant.rs | ||
| repr-disallow-on-variant.stderr | ||
| repr-packed-contains-align.rs | ||
| repr-packed-contains-align.stderr | ||
| repr-transparent-issue-87496.rs | ||
| repr-transparent-issue-87496.stderr | ||
| repr-transparent-non-exhaustive.rs | ||
| repr-transparent-non-exhaustive.stderr | ||
| repr-transparent-other-items.rs | ||
| repr-transparent-other-items.stderr | ||
| repr-transparent-other-reprs.rs | ||
| repr-transparent-other-reprs.stderr | ||
| repr-transparent.rs | ||
| repr-transparent.stderr | ||
| repr.rs | ||
| repr.stderr | ||
| transparent-enum-too-many-variants.rs | ||
| transparent-enum-too-many-variants.stderr | ||