emit rustc-check-cfg info and fix doc_lazy_continuation clippy warning #501

Job	Run time
Check (stable)	13s
Test Suite (ubuntu-latest)	1m 8s
Test Suite (windows-latest)	3m 20s
Rustfmt (stable)	8s
Clippy (stable)	38s
Test Suite (macOS-latest)	56s
Miri	1m 20s
Test Suite	3m 46s
Test Suite (stable)	1m 2s
Test Suite (--no-default-features)	3m 39s
Test Suite (stable, --no-default-features)	58s
Test Suite (stable, --no-default-features --features track-caller)	55s
Test Suite (stable, --no-default-features --features auto-install)	54s
Test Suite (--no-default-features --features track-caller)	3m 42s
Test Suite (stable, --features pyo3)	1m 4s
Test Suite (--no-default-features --features auto-install)	3m 39s
Test Suite (stable, --all-features)	1m 16s
Test Suite (beta)	1m 5s
Test Suite (beta, --no-default-features)	58s
Test Suite (beta, --no-default-features --features track-caller)	1m 0s
Test Suite (beta, --no-default-features --features auto-install)	58s
Test Suite (beta, --features pyo3)	1m 11s
Test Suite (beta, --all-features)	1m 13s
Test Suite (nightly)	1m 5s
Test Suite (nightly, --no-default-features)	1m 1s
Test Suite (nightly, --no-default-features --features track-caller)	1m 1s
Test Suite (nightly, --no-default-features --features auto-install)	1m 3s
Test Suite (nightly, --features pyo3)	1m 8s
Test Suite (nightly, --all-features)	1m 6s
	41m 27s

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