Re-export docutils .. class:: as .. rst-class:: and un-document .. cssclass::.

doc/markup/desc.rst

@@ -187,10 +187,6 @@ The directives are:
 
    The first way is the preferred one.
 
-   .. versionadded:: 0.4
-      The standard reST directive ``class`` is now provided by Sphinx under
-      the name ``cssclass``.
-
 .. directive:: .. attribute:: name
 
    Describes an object data attribute.  The description should include

doc/rest.rst

@@ -281,6 +281,7 @@ Docutils supports the following directives:
 
   - :rstdir:`raw` (include raw target-format markup)
   - :rstdir:`include` (include reStructuredText from another file)
+  - :rstdir:`class` (assign a class attribute to the next element) [1]_
 
 * HTML specifics:
 
@@ -451,3 +452,9 @@ There are some problems one commonly runs into while authoring reST documents:
 
 * **No nested inline markup:** Something like ``*see :func:`foo`*`` is not
   possible.
+
+
+.. rubric:: Footnotes
+
+.. [1] When the default domain contains a :dir:`class` directive, this directive
+       will be shadowed.  Therefore, Sphinx re-exports it as :dir:`rst-class`.

sphinx/directives/other.py

@@ -380,6 +380,8 @@ directives.register_directive('hlist', HList)
 directives.register_directive('only', Only)
 
 # register the standard rst class directive under a different name
-# only for backwards compatibility now
 from docutils.parsers.rst.directives.misc import Class
+# only for backwards compatibility now
 directives.register_directive('cssclass', Class)
+# new standard name when default-domain with "class" is in effect
+directives.register_directive('rst-class', Class)