Improve syntax detection #8670

Job	Run time
build-linux-arm (nightly)	5m 34s
build (ubuntu-latest, nightly)	1m 55s
build-linux-arm (stable)	5m 10s
build-linux-musl (nightly)	3m 20s
build (ubuntu-latest, stable)	1m 43s
build-apple-x86 (nightly)	2m 10s
build-linux-arm (1.70)	5m 21s
build-linux-musl (stable)	2m 50s
build (ubuntu-latest, 1.70)	2m 0s
build-apple-x86 (stable)	2m 6s
build-linux-musl (1.70)	2m 58s
build (macos-latest, nightly)	3m 24s
build-apple-x86 (1.70)	2m 24s
Lints	32s
build (macos-latest, stable)	2m 9s
Changelog Test	4s
build (macos-latest, 1.70)	2m 52s
udeps	2m 17s
build (windows-latest, nightly)	5m 18s
build (windows-latest, stable)	4m 2s
build (windows-latest, 1.70)	4m 42s
	1h 2m 51s

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