[issue37942] Generate correct error check for PyFloat_AsDouble

[Raymond Hettinger]

Raymond Hettinger <raymond.hettin...@gmail.com> added the comment:

Note, the argument clinic is already generating code like this for return 
values in "class double_return_converter".  For example,

    _return_value = _statistics__normal_dist_inv_cdf_impl(module, p, mu, sigma);
    if ((_return_value == -1.0) && PyErr_Occurred()) {
        goto exit;
    }

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<https://bugs.python.org/issue37942>
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