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Rollup of 7 pull requests#107249

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Dylan-DPC wants to merge 20 commits intorust-lang:masterrust-lang/rust:masterfrom

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Commits on Jan 13, 2023

• Allow fmt::Arguments::as_str() to return more Some(_).

  m-ou-se

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Commits on Jan 19, 2023

• Add `OnceCell<T>: !Sync` impl for diagnostics

  Noratrieb

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• Add `rustc_on_unimplemented` on `Sync` for cell types

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  Noratrieb

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Commits on Jan 23, 2023

• Suggest coercion of `Result` using `?`

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  estebank

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• review comment: use `fcx.infcx`

  estebank

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• Add call in `emit_type_mismatch_suggestions`

  estebank

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• Do not erase regions

  estebank

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• Ensure suggestion correctness

  estebank

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• tweak wording

  estebank

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• `new_outside_solver` -> `evaluate_root_goal`

  lcnr

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• rustc_metadata: Support non-`Option` nullable values in metadata tables

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  petrochenkov

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• Add hint for missing lifetime bound on trait object when type alias is used

  

  yanchen4791

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Commits on Jan 24, 2023

• Add suggestion to remove if in let...else block

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  edward-shen

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• Rollup merge of #105345 - yanchen4791:issue-103582-fix, r=jackh726

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  Dylan-DPC

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• Rollup merge of #106583 - estebank:suggest-result-coercion, r=compiler-errors

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  Dylan-DPC

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• Rollup merge of #106823 - m-ou-se:format-args-as-str-guarantees, r=dtolnay

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• Rollup merge of #106944 - Nilstrieb:there-once-was-a-diagnostic, r=WaffleLapkin

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• Rollup merge of #107166 - petrochenkov:nooptable, r=oli-obk

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• Rollup merge of #107213 - edward-shen:edward-shen/fix-accidental-let-else, r=compiler-errors

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• Rollup merge of #107227 - lcnr:solver-new-external-api, r=compiler-errors

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