Fix no-std #612

Job	Run time
clippy-pedantic	18s
test (1.60, ubuntu-20.04)	1m 26s
DevSkim	34s
audit	13s
test (1.60, ubuntu-20.04, -Zminimal-versions)	1m 37s
audit (-Zminimal-versions)	18s
doc	30s
test (1.60, windows-2022)	2m 23s
test (1.60, windows-2022, -Zminimal-versions)	2m 23s
fmt	18s
package	19s
test (1.60, macos-12)	2m 1s
test (1.60, macos-12, -Zminimal-versions)	2m 17s
test (stable, ubuntu-20.04)	20s
test (stable, ubuntu-20.04, -Zminimal-versions)	23s
test (stable, windows-2022)	59s
test (stable, windows-2022, -Zminimal-versions)	45s
test (stable, macos-12)	39s
test (stable, macos-12, -Zminimal-versions)	1m 5s
test (nightly, ubuntu-20.04)	24s
test (nightly, ubuntu-20.04, -Zminimal-versions)	27s
test (nightly, windows-2022)	1m 6s
test (nightly, windows-2022, -Zminimal-versions)	1m 5s
test (nightly, macos-12)	45s
test (nightly, macos-12, -Zminimal-versions)	59s
	23m 34s

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