[Cython] Bug in DictNode

[Martin C. Martin]

In case it makes a difference, this DictNode is the "dict" attribute of 
a PyClassDefNode, created from this:

class Spam:
    pass

Best,
Martin

Martin C. Martin wrote:
> Hi,
> 
> Calling get_child_accessors() on a DictNode throws an exception, 
> because, because it doesn't define a child_attrs field (and thus 
> inherits the value None from class Node), so get_child_attrs() checks 
> self.subexprs to see if it's None, but the field doesn't exist.  So, 
> what's the right fix?
> 
> - Change get_child_attrs() to look at self.saved_subexpr_nodes instead 
> of self.subexprs?
> - Add "subexprs = None" to ExprNode?
> - Add "subexprs = None" to DictNode?
> - Something else?
> 
> Best,
> Martin
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