def transform_describe_body(self, body, group_var):
        """
        Transform the body of an ``ExampleGroup``.

        ``body`` is the body.
        ``group_var`` is the name bound to the example group in the context
        manager (usually "it").

        """

        for node in body:
            withitem, = node.items
            context_expr = withitem.context_expr

            name = context_expr.args[0].s
            context_var = withitem.optional_vars.id

            yield self.transform_example(node, name, context_var, group_var)