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Allow empty specifier in constraints #8209

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Allow empty specifier in constraints #8209

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3 changes: 1 addition & 2 deletions src/pip/_internal/resolution/resolvelib/resolver.py
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Original file line number Diff line number Diff line change
Expand Up @@ -74,8 +74,7 @@ def resolve(self, root_reqs, check_supported_wheels):
requirements = []
for req in root_reqs:
if req.constraint:
assert req.name
assert req.specifier
assert req.name, "constraint should have a name"
name = canonicalize_name(req.name)
if name in constraints:
constraints[name] = constraints[name] & req.specifier
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