Implement Display and Error for EvalErr (#334) #1503

Job	Run time
Run fuzz targets (macos-latest, 3.7)	43m 18s
Run fuzz targets (ubuntu-latest, 3.7)	27m 14s
Unit tests (macos-latest, 3.7)	8m 25s
Unit tests (ubuntu-latest, 3.7)	5m 39s
Unit tests (windows-latest, 3.7)	8m 29s
Wheel on macos-latest py-3.7	3m 58s
Wheel on ubuntu-latest py-3.7	3m 24s
Wheel on windows-latest py-3.7	3m 54s
Checks	1m 15s
coverage	26m 29s
	2h 12m 5s

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