Merge pull request #917 from LaurentMazare/clippy-fixes #1025

Job	Run time
Rustfmt	8s
Clippy	55s
Test Suite (ubuntu-latest, stable)	1m 23s
Test Suite (ubuntu-latest, nightly)	1m 21s
Check (ubuntu-latest, stable)	1m 13s
Test Suite (macOS-latest, stable)	1m 25s
Check (ubuntu-latest, nightly)	1m 17s
Test Suite (macOS-latest, nightly)	1m 20s
Check (windows-2019, stable)	2m 45s
Check (windows-2019, nightly)	2m 10s
Check (macOS-latest, stable)	57s
Check (macOS-latest, nightly)	1m 2s
	15m 56s

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