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Fix `unsafe_op_in_unsafe_fn` lint #825

Job	Run time
build_and_test_windows	3m 49s
clippy	42s
build_and_test (stable, --features "")	1m 41s
build_and_test_macos (macos-13)	1m 52s
build_and_test (stable, --all-features)	2m 10s
build_and_test_macos (macos-latest)	1m 34s
codecov	1m 29s
build_and_test (stable, --no-default-features)	1m 17s
fmt	56s
build_and_test (1.77, --features "")	1m 39s
build_and_test (1.77, --all-features)	2m 31s
build_and_test (1.77, --no-default-features)	1m 9s
minimal-versions	1m 6s
semver	1m 40s
build_and_test (beta, --features "")	1m 31s
build_and_test (beta, --all-features)	2m 7s
build_and_test (beta, --no-default-features)	1m 15s
build_and_test (nightly, --features "")	1m 18s
build_and_test (nightly, --all-features)	1m 41s
build_and_test (nightly, --no-default-features)	55s
	32m 22s

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