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more cleanups#69619

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bors merged 4 commits intorust-lang:masterrust-lang/rust:masterfrom matthiaskrgr:miscmatthiaskrgr/rust:miscCopy head branch name to clipboardMar 3, 2020

+15-18

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Commits on Mar 1, 2020

• use starts_with() instead of chars().next() == Some(x)

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  eda8d82

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• use subdsec_micros() instead of subsec_nanos() / 1000

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  03aecda

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• use for (idx, item) in iter.enumerate() instead of manually counting loop iterations by variables

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  22339c3

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Commits on Mar 2, 2020

• use values() or keys() respectively when iterating only over keys or values of maps.

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  21affdd

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