[issue1810] Partial AST compile() patch

[Georg Brandl]

Georg Brandl added the comment:

This is great work!

The problem is that ast2obj_object translates NULL values to Py_None,
but obj2ast_object doesn't translate that back. This definition fixes
your testcase:

static int obj2ast_object(PyObject* obj, PyObject** out, PyArena* arena)
{
    if (obj == Py_None)
        obj = NULL;
    Py_XINCREF(obj);
    *out = obj;
    return 0;
}

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<http://bugs.python.org/issue1810>
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