Fix #1462: autosummary warns for namedtuple with attribute with trailing underscore

tests/roots/test-autosummary/dummy_module.py

@@ -69,3 +69,7 @@ class C:
         '''
         This is a nested inner class docstring
         '''
+
+
+def func(arg_):
+    """Test function take an argument ended with underscore."""

tests/test_util_rst.py

@@ -0,0 +1,16 @@
+# -*- coding: utf-8 -*-
+"""
+    test_util_rst
+    ~~~~~~~~~~~~~~~
+
+    Tests sphinx.util.rst functions.
+
+    :copyright: Copyright 2007-2016 by the Sphinx team, see AUTHORS.
+    :license: BSD, see LICENSE for details.
+"""
+from sphinx.util.rst import escape
+
+
+def test_escape():
+    assert escape(':ref:`id`') == '\:ref\:\`id\`'
+    assert escape('footnote [#]_') == 'footnote \[\#\]\_'