Shrink unsafe block #1185

Job	Run time
Clippy	33s
Clippy nightly (optional)	23s
Build+test (clang, stable, ubuntu-20.04)	1m 13s
Build+test (clang, beta, ubuntu-20.04)	1m 22s
Build+test (clang, nightly, ubuntu-20.04)	1m 27s
Build+test (clang, 1.60.0, ubuntu-20.04)	2m 25s
Build+test (gcc, stable, ubuntu-20.04)	1m 7s
Build+test (gcc, beta, ubuntu-20.04)	59s
Build+test (gcc, nightly, ubuntu-20.04)	1m 8s
Build+test (gcc, 1.60.0, ubuntu-20.04)	2m 51s
Build+test (macos-latest, clang, stable)	1m 46s
Clang Tidy	8s
Check for documentation errors	24s
ensure-header-updated	2m 9s
Format	22s
Check minimum versions	27s
Miri	1m 7s
Windows	2m 5s
Windows CMake, Release configuration	2m 51s
Windows CMake, Debug configuration	3m 19s
Valgrind	1m 11s
	29m 17s

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