fix rstml #165

Job	Run time
test (ubuntu-latest, stable)	4m 10s
test (ubuntu-latest, stable, --no-default-features)	3m 37s
test (ubuntu-latest, nightly)	4m 2s
test (ubuntu-latest, nightly, --no-default-features)	3m 32s
test (windows-latest, stable)	7m 17s
test (windows-latest, stable, --no-default-features)	5m 56s
test (windows-latest, nightly)	6m 53s
test (windows-latest, nightly, --no-default-features)	6m 5s
test (macos-latest, stable)	8m 23s
test (macos-latest, stable, --no-default-features)	7m 18s
test (macos-latest, nightly)	7m 26s
test (macos-latest, nightly, --no-default-features)	8m 11s
	1h 12m 50s

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