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fix more clippy findings#69802

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bors merged 12 commits intorust-lang:masterrust-lang/rust:masterfrom

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Mar 13, 2020

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Commits on Mar 7, 2020

• rustdoc: don't call into_iter() on iterator. (clippy::identity_conversion)

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• rustdoc: Use .any(p) instead of find(p).is_some(). (clippy::search_is_some)

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• Use ?-operator in more places (clippy::question_mark, had some false negatives fixed recently)

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• rustdoc: simplify boolean condition (clippy::nonminimal_bool)

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• iterate over a maps values directly. (clippy::for_kv_map)

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• call .as_deref() instead of .as_ref().map(Deref::deref) (clippy::option_as_ref_deref)

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• rustdoc: remove redundant static lifetimes (clippy::redundant_static_lifetimes)

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• libtest: declare variables as floats instead of casting them (clippy::unnecessary_cast)

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• remove unneeded mutable references (cippy::unnecessary_mut_passed)

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• libtest: remove redundant argument to writeln!() (clippy::writeln_empty_string)

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• Use writeln!(fmt, "word") instead of write!(fmt, "word\n") (clippy::write_with_newline)

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• reduce references on match patterns (clippy::match_ref_pats)

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