Fix source order sorting. #1586

Job	Run time
docs	36s
minimal	22s
msrv	2m 38s
check-cfg	33s
quickchecking	26s
rustfmt-clippy	38s
test (ubuntu-latest, 5.0, 1, 0, 0, 0, 0)	1m 10s
test (ubuntu-latest, 5.0, 1, 0, 0, 1, 0)	1m 15s
test (ubuntu-latest, 5.0, 1, 0, 1, 0, 0)	57s
test (ubuntu-latest, 5.0, 1, 0, 1, 1, 0)	1m 8s
test (ubuntu-latest, 5.0, 1, 1, 0, 0, 0)	58s
test (ubuntu-latest, 5.0, 1, 1, 0, 1, 0)	1m 7s
test (ubuntu-latest, 5.0, 1, 1, 1, 0, 0)	1m 14s
test (ubuntu-latest, 5.0, 1, 1, 1, 1, 0)	1m 13s
test (ubuntu-latest, 9.0, 1, 0, 0, 0, 0)	1m 10s
test (ubuntu-latest, 9.0, 1, 0, 0, 1, 0)	1m 12s
test (ubuntu-latest, 9.0, 1, 0, 1, 0, 0)	1m 13s
test (ubuntu-latest, 9.0, 1, 0, 1, 1, 0)	1m 10s
test (ubuntu-latest, 9.0, 1, 1, 0, 0, 0)	1m 11s
test (ubuntu-latest, 9.0, 1, 1, 0, 1, 0)	1m 13s
test (ubuntu-latest, 9.0, 1, 1, 1, 0, 0)	1m 10s
test (ubuntu-latest, 9.0, 1, 1, 1, 1, 0)	1m 11s
test (ubuntu-latest, 9.0, 0, 0, 1)	1m 10s
test (macos-latest, 9.0, 0, 0, 0)	1m 9s
test-book	8s
test-expectations (ubuntu-latest)	1m 56s
test-expectations (macos-latest)	3m 55s
	32m 3s

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