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diff --git a/Doc/library/ast.rst b/Doc/library/ast.rst
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@@ -41,6 +41,9 @@ Node classes
with alternatives (aka "sums"), the left-hand side class is abstract: only
instances of specific constructor nodes are ever created.
+ .. index:: single: ? (question mark); in AST grammar
+ .. index:: single: * (asterisk); in AST grammar
+
.. attribute:: _fields
Each concrete class has an attribute :attr:`_fields` which gives the names