error/E0691: include alignment in error message #113913
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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 rust-lang#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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(fixed test assuming |
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Jul 21, 2023
…iaskrgr Rollup of 4 pull requests Successful merges: - rust-lang#113887 (new solver: add a separate cache for coherence) - rust-lang#113910 (Add FnPtr ty to SMIR) - rust-lang#113913 (error/E0691: include alignment in error message) - rust-lang#113914 (rustc_target: drop duplicate code) r? `@ghost` `@rustbot` modify labels: rollup
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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:
This patch changes the report to include the alignment of the violating field:
In case of unknown alignments, it will yield:
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.
(Originally proposed by @compiler-errors in #98071)