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Rollup of 5 pull requests#81853

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bors merged 15 commits intorust-lang:masterrust-lang/rust:masterfrom

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Feb 7, 2021

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Commits on Jan 29, 2021

• btree: use Option's unwrap_unchecked()

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  ojeda

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Commits on Feb 4, 2021

• Add a note about the correctness and the effect on unsafe code to the `ExactSizeIterator` docs

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  sdroege

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Commits on Feb 6, 2021

• Add long error explanation for E0542

  jesusprubio

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• Update compiler/rustc_error_codes/src/error_codes/E0542.md

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  jesusprubio

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  GuillaumeGomez

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• Format fixes

  jesusprubio

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• Improve long explanation for E0546

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• Comments updated to keep the consistency

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• References added

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• Typo fix

  jesusprubio

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• Add regression test for #29821

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  bstrie

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Commits on Feb 7, 2021

• Rollup merge of #81526 - ojeda:btree-use-unwrap_unchecked, r=scottmcm

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• Rollup merge of #81742 - sdroege:exact-size-iterator-correctness, r=kennytm

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• Rollup merge of #81830 - jesusprubio:add-log-explanation-e0542, r=GuillaumeGomez

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• Rollup merge of #81835 - jesusprubio:improve-long-eplanation-e0546, r=GuillaumeGomez

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• Rollup merge of #81843 - bstrie:issue-29821, r=lcnr

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