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Ehance opt_as_ref_deref lint.#5425

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bors merged 2 commits intorust-lang:masterrust-lang/rust-clippy:masterfrom xiongmao86:issue5367xiongmao86/rust-clippy:issue5367Copy head branch name to clipboardApr 8, 2020

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Commits on Apr 6, 2020

• Lint on opt.as_ref().map(|x| &**x).

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Commits on Apr 7, 2020

• Refine lint message.

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