#6513: fix example code: warning categories are classes, not instances.
diff --git a/Doc/library/warnings.rst b/Doc/library/warnings.rst
index d36955f..8fa6952 100644
--- a/Doc/library/warnings.rst
+++ b/Doc/library/warnings.rst
@@ -204,7 +204,7 @@
fxn()
# Verify some things
assert len(w) == 1
- assert isinstance(w[-1].category, DeprecationWarning)
+ assert issubclass(w[-1].category, DeprecationWarning)
assert "deprecated" in str(w[-1].message)
One can also cause all warnings to be exceptions by using ``error`` instead of