BUG: missing error on name without leading / #4361

Job	Run time
pytest on windows	5m 0s
Check code style issues	40s
Build & verify package	10s
pytest on 3.7 (crypto-lib: cryptography)	3m 25s
pytest on 3.8 (crypto-lib: cryptography)	3m 39s
pytest on 3.9 (crypto-lib: cryptography)	3m 50s
pytest on 3.10 (crypto-lib: cryptography)	3m 32s
pytest on 3.11 (crypto-lib: cryptography)	3m 44s
pytest on 3.12 (crypto-lib: cryptography)	4m 42s
pytest on 3.7 (crypto-lib: pycryptodome)	3m 32s
pytest on 3.7 (crypto-lib: none)	3m 53s
Combine & check coverage.	28s
	36m 35s

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