Add explicit error message for URLs without package names #669
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pip
supports installing packages without names (e.g.,git+https://github.com/pallets/flask.git
), but it doesn't adhere to the PEP grammar, and we don't yet support it (and may never) (#313).This PR adds a dedicated error path for such cases, to ensure that we can give meaningful feedback to the user:
Closes #650.