Test

Add `opt_in` crate feature #1768

Job	Run time
iOS Simulator	3m 52s
Linux (x86_64-unknown-linux-musl)	20s
Windows (stable-x86_64-gnu)	58s
Linux (i686-unknown-linux-musl)	22s
Cross (aarch64-unknown-linux-gnu)	24s
Windows (stable-i686-gnu)	42s
FreeBSD VM	2m 35s
Cross (powerpc-unknown-linux-gnu)	25s
Windows (stable-i686-msvc)	1m 17s
Cross (wasm32-unknown-emscripten)	44s
OpenBSD VM	2m 0s
Sanitizer	36s
Tier 1 (ubuntu-24.04, nightly)	20s
WASI	22s
Tier 1 (ubuntu-24.04, beta)	17s
Web	16s
Windows 7 (on Windows 10)	1m 31s
Tier 1 (ubuntu-24.04, stable)	18s
Web with Atomics	31s
Tier 1 (ubuntu-24.04, 1.63)	37s
Tier 1 (windows-2022, nightly)	38s
Tier 1 (windows-2022, beta)	48s
Tier 1 (windows-2022, stable)	1m 38s
Tier 1 (windows-2022, 1.63)	1m 22s
Tier 1 (macos-14, stable)	21s
	23m 14s

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