BUG: missing error on name without leading / #4182

Job	Run time
pytest on windows	5m 4s
Check code style issues	20s
pytest on 3.7 (crypto-lib: cryptography)	3m 24s
Build & verify package	15s
pytest on 3.8 (crypto-lib: cryptography)	3m 34s
pytest on 3.9 (crypto-lib: cryptography)	3m 41s
pytest on 3.10 (crypto-lib: cryptography)	3m 45s
pytest on 3.11 (crypto-lib: cryptography)	3m 20s
pytest on 3.12 (crypto-lib: cryptography)	5m 0s
pytest on 3.7 (crypto-lib: pycryptodome)	3m 37s
pytest on 3.7 (crypto-lib: none)	3m 23s
Combine & check coverage.	16s
	35m 39s

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