Improve exception diagnostics for stdio client #291

Job	Run time
build (windows-latest, Debug)	5m 17s
build (ubuntu-latest, Release)	2m 27s
build (ubuntu-latest, Debug)	5m 41s
build (windows-latest, Release)	5m 13s
build (macos-latest, Release)	1m 40s
build (macos-latest, Debug)	2m 3s
publish-coverage / publish-coverage	33s
	22m 54s

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