[issue15987] Provide a way to compare AST nodes for equality recursively

[Julian Berman]

Julian Berman added the comment:

I'd say yes (to both lineno/col_offset). And yeah that sounds like what I had in mind (a helper function).

If I'm specific for a moment about implementation, perhaps something like `ast.diff`, which yielded tuples of differing nodes (in say, breadth first order down the tree) from two given nodes, and took args for configuration, compare_lineno and compare_col_offset (both defaulted to True), and then __eq__ was just `next(ast.diff(self, other, compare_lineno=True, compare_col_offset=True), None) is None`.

Sound good to you?

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<http://bugs.python.org/issue15987>
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