Add version pin for docutils on Python 2.7.

docutils 0.18 breaks old sphinx with 'TypeError: argument to reversed() must be a sequence' because node.traverse returns a generator.

1 files changed, 3 insertions, 0 deletions

diff --git a/setup.py b/setup.py
index 2d901c9..66af1c5 100755
--- a/setup.py
+++ b/setup.py
@@ -176,6 +176,9 @@ setup(
     extras_require={
         'docs': [
             'Sphinx',
+            # 0.18b1 breaks sphinx 1.8.5 which is the latest version that runs
+            # on Python 2. The version pin sphinx itself contains isn't specific enough.
+            'docutils < 0.18; python_version < "3"',
         ],
         'test': [
             'objgraph',