parser-common: allow `::` in source file paths #252

Job	Run time
Ubuntu 20.04 (clang++)	1m 55s
Ubuntu 22.04 (clang++ with sanitizers)	3m 33s
Ubuntu 20.04 (g++)	1m 30s
Ubuntu 22.04 (g++ with sanitizers)	3m 44s
	10m 42s

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