Fix AttributeError in Description validation. Fixes #2539.

49364a9e · Jason R. Coombs · c5e0397b · 49364a9e · 49364a9e
Commit 49364a9e authored Jan 17, 2021 by Jason R. Coombs
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changelog.d/2539.misc.rst changelog.d/2539.misc.rst +1 -0

setuptools/dist.py setuptools/dist.py +1 -1

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--- a/changelog.d/2539.misc.rst
+++ b/changelog.d/2539.misc.rst
+Fix AttributeError in Description validation.
--- a/setuptools/dist.py
+++ b/setuptools/dist.py
@@ -122,7 +122,7 @@ def single_line(val):
    # quick and dirty validation for description pypa/setuptools#1390
    if '\n' in val:
        # TODO after 2021-07-31: Replace with `raise ValueError("newlines not allowed")`
-        warnings.UserWarning("newlines not allowed and will break in the future")
+        warnings.warn("newlines not allowed and will break in the future")
        val = val.replace('\n', ' ')
    return val