Hard fail on Python 3 prior to 3.3. Fixes #864.

CHANGES.rst

@@ -2,6 +2,12 @@
 CHANGES
 =======
 
+v30.0.0
+-------
+
+* #864: Drop support for Python 3.2. Systems requiring
+  Python 3.2 support must use 'setuptools < 30'.
+
 v29.0.1
 -------
 

pkg_resources/__init__.py

@@ -75,11 +75,7 @@ __import__('pkg_resources.extern.packaging.requirements')
 __import__('pkg_resources.extern.packaging.markers')
 
 if (3, 0) < sys.version_info < (3, 3):
-    msg = (
-        "Support for Python 3.0-3.2 has been dropped. Future versions "
-        "will fail here."
-    )
-    warnings.warn(msg)
+    raise RuntimeError("Python 3.3 or later is required")
 
 # declare some globals that will be defined later to
 # satisfy the linters.