7d36bfa6c0
some fixes for clashing_extern_declarations lint There were two issues with the clashing_extern_declarations lint: - It would accept non-`repr(C)` structs as compatible with each other by comparing their fields in declaration order, but the fields could have different memory order (and with `-Zrandomize-layout`, this can really happen). - It would accept two types as compatible if `compare_layouts` returns `true`, but that function actually just compared the *ABI*, not the fully layout -- and all sized structs with more than 2 fields have the same ABI (`Abi::Aggregate`), so this missed a *lot* of cases. We don't currently have a clear spec for what we *want* to consider "clashing" and what is fine, so I otherwise kept the original logic. I hope to have a t-lang discussion about this at some point. But meanwhile, these changes seem like clear bugfixes. |
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