Improve syntax detection (#2524) #8676

Job	Run time
build-apple-x86 (nightly)	2m 7s
build-linux-musl (nightly)	2m 59s
build-apple-x86 (stable)	2m 5s
build (ubuntu-latest, nightly)	1m 58s
build-linux-arm (nightly)	5m 25s
build-linux-musl (stable)	3m 47s
build (ubuntu-latest, stable)	1m 43s
build-apple-x86 (1.70)	1m 49s
build-linux-musl (1.70)	3m 4s
build-linux-arm (stable)	5m 48s
build (ubuntu-latest, 1.70)	1m 54s
build-linux-arm (1.70)	5m 46s
build (macos-latest, nightly)	2m 7s
Lints	41s
build (macos-latest, stable)	2m 43s
build (macos-latest, 1.70)	3m 12s
Changelog Test	5s
udeps	2m 16s
build (windows-latest, nightly)	6m 15s
build (windows-latest, stable)	4m 40s
build (windows-latest, 1.70)	6m 44s
	1h 7m 8s

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