Add todo comment #3217

Job	Run time
test (no rustup)	1m 55s
test (1.26)	6m 43s
test (stable)	3m 12s
test (1.30)	4m 34s
test (beta)	3m 10s
test (1.31)	5m 5s
test (nightly)	3m 18s
test (1.36)	5m 46s
test (nightly, macos-latest)	3m 4s
test (1.39)	5m 44s
test (nightly, windows-latest)	4m 28s
test (1.41)	5m 51s
deny / deny	16s
miri / miri	1m 2s
msrv / msrv	4m 9s
release-dry-run / prepare	4s
tidy / tidy	1m 2s
release-dry-run / build (aarch64-unknown-linux-gnu)	1m 19s
release-dry-run / build (aarch64-unknown-linux-musl)	1m 1s
release-dry-run / build (aarch64-apple-darwin, macos-12)	1m 11s
release-dry-run / build (aarch64-pc-windows-msvc, windows-2019)	2m 53s
release-dry-run / build (x86_64-unknown-linux-gnu)	43s
release-dry-run / build (x86_64-unknown-linux-musl)	53s
release-dry-run / build (x86_64-apple-darwin, macos-12)	1m 11s
release-dry-run / build (x86_64-pc-windows-msvc, windows-2019)	1m 49s
release-dry-run / build (x86_64-unknown-freebsd)	1m 57s
release-dry-run / build (x86_64-unknown-illumos)	55s
release-dry-run / build (universal-apple-darwin, macos-12)	1m 25s
	1h 14m 40s

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