Fix source order sorting. #1569

Job	Run time
docs	28s
rustfmt-clippy	45s
check-cfg	32s
minimal	15s
quickchecking	36s
msrv	2m 42s
test-book	12s
test (ubuntu-latest, 5.0, 1, 0, 0, 0, 0)	2m 25s
test (ubuntu-latest, 5.0, 1, 0, 0, 1, 0)	2m 25s
test (ubuntu-latest, 5.0, 1, 0, 1, 0, 0)	2m 22s
test (ubuntu-latest, 5.0, 1, 0, 1, 1, 0)	2m 8s
test (ubuntu-latest, 5.0, 1, 1, 0, 0, 0)	2m 24s
test (ubuntu-latest, 5.0, 1, 1, 0, 1, 0)	2m 25s
test (ubuntu-latest, 5.0, 1, 1, 1, 0, 0)	2m 23s
test (ubuntu-latest, 5.0, 1, 1, 1, 1, 0)	2m 26s
test (ubuntu-latest, 9.0, 1, 0, 0, 0, 0)	2m 22s
test (ubuntu-latest, 9.0, 1, 0, 0, 1, 0)	2m 24s
test (ubuntu-latest, 9.0, 1, 0, 1, 0, 0)	2m 22s
test (ubuntu-latest, 9.0, 1, 0, 1, 1, 0)	2m 27s
test (ubuntu-latest, 9.0, 1, 1, 0, 0, 0)	2m 23s
test (ubuntu-latest, 9.0, 1, 1, 0, 1, 0)	2m 24s
test (ubuntu-latest, 9.0, 1, 1, 1, 0, 0)	2m 24s
test (ubuntu-latest, 9.0, 1, 1, 1, 1, 0)	2m 24s
test (ubuntu-latest, 9.0, 0, 0, 1)	2m 21s
test (macos-latest, 9.0, 0, 0, 0)	2m 22s
test-expectations (ubuntu-latest)	1m 54s
test-expectations (macos-latest)	4m 30s
	54m 45s

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