BUG: missing error on name without leading / #4295

Job	Run time
Check code style issues	35s
Build & verify package	10s
pytest on windows	4m 49s
pytest on 3.7 (crypto-lib: cryptography)	3m 31s
pytest on 3.8 (crypto-lib: cryptography)	3m 46s
pytest on 3.9 (crypto-lib: cryptography)	3m 43s
pytest on 3.10 (crypto-lib: cryptography)	3m 31s
pytest on 3.11 (crypto-lib: cryptography)	3m 22s
pytest on 3.12 (crypto-lib: cryptography)	4m 53s
pytest on 3.7 (crypto-lib: pycryptodome)	3m 30s
pytest on 3.7 (crypto-lib: none)	3m 49s
Combine & check coverage.	11s
	35m 50s

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