Test

Add `opt_in` crate feature #1769

Job	Run time
Sanitizer	33s
Linux (x86_64-unknown-linux-musl)	22s
Tier 1 (ubuntu-24.04, nightly)	15s
Linux (i686-unknown-linux-musl)	23s
iOS Simulator	2m 59s
Tier 1 (ubuntu-24.04, beta)	20s
Windows (stable-x86_64-gnu)	41s
Tier 1 (ubuntu-24.04, stable)	18s
Windows (stable-i686-gnu)	43s
Tier 1 (ubuntu-24.04, 1.63)	27s
Windows 7 (on Windows 10)	1m 43s
Tier 1 (windows-2022, nightly)	53s
Windows (stable-i686-msvc)	49s
Tier 1 (windows-2022, beta)	56s
Tier 1 (windows-2022, stable)	1m 37s
Cross (aarch64-unknown-linux-gnu)	29s
Tier 1 (windows-2022, 1.63)	1m 6s
Cross (powerpc-unknown-linux-gnu)	35s
Tier 1 (macos-14, stable)	18s
FreeBSD VM	2m 26s
OpenBSD VM	2m 29s
Cross (wasm32-unknown-emscripten)	37s
WASI	19s
Web	45s
Web with Atomics	59s
	23m 2s

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