Fix bug with unparsing yield types #240

Job	Run time
Test pre-commit console encoding	1m 5s
Test Python 3.8 (ubuntu-latest)	1m 36s
Test Python 3.9 (ubuntu-latest)	1m 45s
Test Python 3.10 (ubuntu-latest)	2m 55s
Test Python 3.11 (ubuntu-latest)	2m 6s
Test Python 3.8 (windows-latest)	4m 55s
Test Python 3.9 (windows-latest)	5m 51s
Test Python 3.10 (windows-latest)	3m 8s
Test Python 3.11 (windows-latest)	3m 20s
Test Python 3.8 (macOS-latest)	10m 42s
Test Python 3.9 (macOS-latest)	2m 8s
Test Python 3.10 (macOS-latest)	6m 23s
Test Python 3.11 (macOS-latest)	2m 25s
	48m 19s

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