fix more clippy findings#69802

Merged

bors merged 12 commits intorust-lang:masterfrom

matthiaskrgr:cl1ppy

Mar 13, 2020

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