Multiple minor lint fixes #2717

Job	Run time
rustfmt-clippy	28s
minimal	12s
check-cfg	20s
msrv	55s
docs	20s
quickchecking	17s
test-book	6s
test (ubuntu-latest, 9.0, 0, 0, 0, 0)	1m 34s
test (ubuntu-latest, 9.0, 0, 0, 1, 0)	1m 40s
test-expectations (ubuntu-latest)	37s
test (ubuntu-latest, 9.0, 0, 1, 0, 0)	1m 47s
test-expectations (macos-latest)	40s
test (ubuntu-latest, 9.0, 0, 1, 1, 0)	1m 40s
test (ubuntu-latest, 9.0, 1, 0, 0, 0)	2m 2s
test-no-headers	27s
test (ubuntu-latest, 9.0, 1, 0, 1, 0)	2m 6s
test (ubuntu-latest, 9.0, 1, 1, 0, 0)	2m 6s
test (ubuntu-latest, 9.0, 1, 1, 1, 0)	2m 12s
test (ubuntu-latest, 16.0, 0, 0, 0, 0)	4m 3s
test (ubuntu-latest, 16.0, 0, 0, 1, 0)	4m 5s
test (ubuntu-latest, 16.0, 0, 1, 0, 0)	3m 56s
test (ubuntu-latest, 16.0, 0, 1, 1, 0)	3m 54s
test (ubuntu-latest, 16.0, 1, 0, 0, 0)	4m 59s
test (ubuntu-latest, 16.0, 1, 0, 1, 0)	4m 52s
test (ubuntu-latest, 16.0, 1, 1, 0, 0)	4m 38s
test (ubuntu-latest, 16.0, 1, 1, 1, 0)	4m 45s
test (ubuntu-latest, 16.0, 0, 0, 1)	2m 27s
test (macos-latest, 16.0, 0, 0, 0)	2m 2s
success	1s
	59m 11s

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