more targeted errors when extern types end up in places they should not #118551
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Rollup of 5 pull requests Successful merges: - rust-lang#118495 (Restrict what symbols can be used in `#[diagnostic::on_unimplemented]` format strings) - rust-lang#118540 (codegen, miri: fix computing the offset of an unsized field in a packed struct) - rust-lang#118551 (more targeted errors when extern types end up in places they should not) - rust-lang#118573 (rustc: Harmonize `DefKind` and `DefPathData`) - rust-lang#118586 (Improve example in `slice::windows()` doc) r? `@ghost` `@rustbot` modify labels: rollup
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Rollup merge of rust-lang#118551 - RalfJung:extern-types-bugs, r=compiler-errors more targeted errors when extern types end up in places they should not Cc rust-lang#115709 -- this does not fix that bug but it makes the panics less obscure and makes it more clear that this is a deeper issue than just a little codegen oversight. (In rust-lang#116115 we decided we'd stick to causing ICEs here for now, rather than nicer errors. We can't currently show any errors pre-mono and probably we don't want post-mono checks when this gets stabilized anyway.)
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Cc #115709 -- this does not fix that bug but it makes the panics less obscure and makes it more clear that this is a deeper issue than just a little codegen oversight. (In #116115 we decided we'd stick to causing ICEs here for now, rather than nicer errors. We can't currently show any errors pre-mono and probably we don't want post-mono checks when this gets stabilized anyway.)