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avoid using `impl` in error_printer example #223

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Run time

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Job	Run time
linux (clang, lld, debug)	1m 20s
linux (clang, lld, release)	1m 47s
windows (debug, false)	1m 11s
linux (gcc, lld, debug)	1m 12s
windows (debug, true)	1m 8s
linux (gcc, lld, release)	2m 2s
windows (release, false)	1m 47s
windows (release, true)	1m 20s
	11m 47s