Patch #1810 by Thomas Lee, reviewed by myself:
allow compiling Python AST objects into code objects
in compile().
diff --git a/Doc/library/language.rst b/Doc/library/language.rst
index d405a4b..7d6af7d 100644
--- a/Doc/library/language.rst
+++ b/Doc/library/language.rst
@@ -15,6 +15,7 @@
 .. toctree::
 
    parser.rst
+   _ast.rst
    symbol.rst
    token.rst
    keyword.rst