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Rollup merge of rust-lang#124919 - nnethercote:Recovered-Yes-ErrorGuaranteed, r=compiler-errors Add `ErrorGuaranteed` to `Recovered::Yes` and use it more. The starting point for this was identical comments on two different fields, in `ast::VariantData::Struct` and `hir::VariantData::Struct`: ``` // FIXME: investigate making this a `Option<ErrorGuaranteed>` recovered: bool ``` I tried that, and then found that I needed to add an `ErrorGuaranteed` to `Recovered::Yes`. Then I ended up using `Recovered` instead of `Option<ErrorGuaranteed>` for these two places and elsewhere, which required moving `ErrorGuaranteed` from `rustc_parse` to `rustc_ast`. This makes things more consistent, because `Recovered` is used in more places, and there are fewer uses of `bool` and `Option<ErrorGuaranteed>`. And safer, because it's difficult/impossible to set `recovered` to `Recovered::Yes` without having emitted an error. r? `@oli-obk`
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