parser-common: allow `::` in source file paths #251

Job	Run time
Ubuntu 20.04 (clang++)	1m 48s
Ubuntu 22.04 (clang++ with sanitizers)	3m 27s
Ubuntu 20.04 (g++)	1m 45s
Ubuntu 22.04 (g++ with sanitizers)	3m 51s
	10m 51s

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